diff --git a/pkgs/applications/office/paperwork/backend.nix b/pkgs/applications/office/paperwork/backend.nix
index 557529964649..2e052243a052 100644
--- a/pkgs/applications/office/paperwork/backend.nix
+++ b/pkgs/applications/office/paperwork/backend.nix
@@ -9,7 +9,7 @@
 }:
 
 buildPythonPackage rec {
-  name = "paperwork-backend-${version}";
+  pname = "paperwork-backend";
   version = "1.2.1";
 
   src = fetchFromGitHub {
diff --git a/pkgs/development/compilers/jsonnet/default.nix b/pkgs/development/compilers/jsonnet/default.nix
index cc19f7afe347..790f9a4827ae 100644
--- a/pkgs/development/compilers/jsonnet/default.nix
+++ b/pkgs/development/compilers/jsonnet/default.nix
@@ -4,6 +4,7 @@ let version = "0.9.4"; in
 
 stdenv.mkDerivation {
   name = "jsonnet-${version}";
+  version = version;
 
   src = fetchFromGitHub {
     rev = "v${version}";
diff --git a/pkgs/development/libraries/boost/generic.nix b/pkgs/development/libraries/boost/generic.nix
index 3f9ae113f849..076f43b71f36 100644
--- a/pkgs/development/libraries/boost/generic.nix
+++ b/pkgs/development/libraries/boost/generic.nix
@@ -125,7 +125,7 @@ in
 stdenv.mkDerivation {
   name = "boost-${version}";
 
-  inherit src patches;
+  inherit src patches version;
 
   meta = {
     homepage = http://boost.org/;
diff --git a/pkgs/development/libraries/kmsxx/default.nix b/pkgs/development/libraries/kmsxx/default.nix
index 490732c38025..8be8eb713572 100644
--- a/pkgs/development/libraries/kmsxx/default.nix
+++ b/pkgs/development/libraries/kmsxx/default.nix
@@ -1,7 +1,9 @@
 { stdenv, fetchFromGitHub, cmake, pkgconfig, libdrm, python }:
 
 stdenv.mkDerivation rec {
-  name = "kmsxx-2017-10-10";
+  pname = "kmsxx";
+  version = "2017-10-10";
+  name = pname + "-" + version;
 
   src = fetchFromGitHub {
     owner = "tomba";
diff --git a/pkgs/development/libraries/libxslt/default.nix b/pkgs/development/libraries/libxslt/default.nix
index bcc0b30f1277..2f9130938734 100644
--- a/pkgs/development/libraries/libxslt/default.nix
+++ b/pkgs/development/libraries/libxslt/default.nix
@@ -10,7 +10,9 @@ assert pythonSupport -> libxml2.pythonSupport;
 with stdenv.lib;
 
 stdenv.mkDerivation rec {
-  name = "libxslt-1.1.29";
+  pname = "libxslt";
+  version = "1.1.29";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "http://xmlsoft.org/sources/${name}.tar.gz";
diff --git a/pkgs/development/python-modules/arelle/default.nix b/pkgs/development/python-modules/arelle/default.nix
index 3c4d802718e8..862564dbcd15 100644
--- a/pkgs/development/python-modules/arelle/default.nix
+++ b/pkgs/development/python-modules/arelle/default.nix
@@ -5,8 +5,9 @@
   ... }:
 
 buildPythonPackage rec {
-  name = "arelle-${version}${lib.optionalString (!gui) "-headless"}";
+  pname = "arelle-${version}${lib.optionalString (!gui) "-headless"}";
   version = "2017-08-24";
+  name = pname + "-" + version;
 
   disabled = !isPy3k;
 
diff --git a/pkgs/development/python-modules/asn1ate/default.nix b/pkgs/development/python-modules/asn1ate/default.nix
index ce07c2376245..7605e2c30858 100644
--- a/pkgs/development/python-modules/asn1ate/default.nix
+++ b/pkgs/development/python-modules/asn1ate/default.nix
@@ -4,7 +4,8 @@
 buildPythonPackage rec {
   pname = "asn1ate";
   date = "20160810";
-  name = "${pname}-unstable-${date}";
+  version = "unstable-${date}";
+  name = "${pname}-${version}";
 
   src = fetchFromGitHub {
     sha256 = "04pddr1mh2v9qq8fg60czwvjny5qwh4nyxszr3qc4bipiiv2xk9w";
diff --git a/pkgs/development/python-modules/augeas/default.nix b/pkgs/development/python-modules/augeas/default.nix
index 8934e1b81a81..def46c7fccc1 100644
--- a/pkgs/development/python-modules/augeas/default.nix
+++ b/pkgs/development/python-modules/augeas/default.nix
@@ -1,7 +1,8 @@
 { stdenv, lib, buildPythonPackage, fetchFromGitHub, augeas, cffi }:
 buildPythonPackage rec {
-    name = "augeas-${version}";
+    pname = "augeas";
     version = "1.0.2";
+    name = pname + "-" + version;
 
     src = fetchFromGitHub {
       owner = "hercules-team";
diff --git a/pkgs/development/python-modules/blockdiag/default.nix b/pkgs/development/python-modules/blockdiag/default.nix
index fed6f6e9219e..fde330d706f7 100644
--- a/pkgs/development/python-modules/blockdiag/default.nix
+++ b/pkgs/development/python-modules/blockdiag/default.nix
@@ -3,8 +3,9 @@
 }:
 
 buildPythonPackage rec {
-  name = "blockdiag-${version}";
+  pname = "blockdiag";
   version = "1.5.3";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "https://bitbucket.org/blockdiag/blockdiag/get/${version}.tar.bz2";
diff --git a/pkgs/development/python-modules/bottleneck/default.nix b/pkgs/development/python-modules/bottleneck/default.nix
index 4eb5bcb6edc9..791b05e81cad 100644
--- a/pkgs/development/python-modules/bottleneck/default.nix
+++ b/pkgs/development/python-modules/bottleneck/default.nix
@@ -8,8 +8,9 @@
 
 buildPythonPackage rec {
   pname = "Bottleneck";
-  name = "Bottleneck-${version}";
   version = "1.2.1";
+  name = pname + "-" + version;
+
   src = fetchPypi {
     inherit pname version;
     sha256 = "6efcde5f830aed64feafca0359b51db0e184c72af8ba6675b4a99f263922eb36";
@@ -23,4 +24,4 @@ buildPythonPackage rec {
   postPatch = ''
     substituteInPlace setup.py --replace "__builtins__.__NUMPY_SETUP__ = False" ""
   '';
-}
\ No newline at end of file
+}
diff --git a/pkgs/development/python-modules/cgroup-utils/default.nix b/pkgs/development/python-modules/cgroup-utils/default.nix
index e565e23458ca..2c97cbd4a334 100644
--- a/pkgs/development/python-modules/cgroup-utils/default.nix
+++ b/pkgs/development/python-modules/cgroup-utils/default.nix
@@ -2,7 +2,8 @@
 
 buildPythonPackage rec {
   version = "0.6";
-  name = "cgroup-utils-${version}";
+  pname = "cgroup-utils";
+  name = pname + "-" + version;
 
   buildInputs = [ pep8 nose ];
   # Pep8 tests fail...
diff --git a/pkgs/development/python-modules/construct/default.nix b/pkgs/development/python-modules/construct/default.nix
index 9d8e61d1f450..78aa0aab5c08 100644
--- a/pkgs/development/python-modules/construct/default.nix
+++ b/pkgs/development/python-modules/construct/default.nix
@@ -1,8 +1,9 @@
 { stdenv, buildPythonPackage, fetchFromGitHub, six, pythonOlder }:
 
 buildPythonPackage rec {
-  name = "construct-${version}";
+  pname = "construct";
   version = "2.8.16";
+  name = pname + "-" + version;
 
   src = fetchFromGitHub {
     owner = "construct";
diff --git a/pkgs/development/python-modules/cymem/default.nix b/pkgs/development/python-modules/cymem/default.nix
index f2c6c649a837..8033fa96113e 100644
--- a/pkgs/development/python-modules/cymem/default.nix
+++ b/pkgs/development/python-modules/cymem/default.nix
@@ -5,8 +5,9 @@
 , python
 }:
 buildPythonPackage rec {
-  name = "cymem-${version}";
+  pname = "cymem";
   version = "1.31.2";
+  name = pname + "-" + version;
 
   src = fetchFromGitHub {
     owner = "explosion";
@@ -16,14 +17,14 @@ buildPythonPackage rec {
   };
 
   propagatedBuildInputs = [
-   cython   
+   cython
   ];
-    
+
   checkPhase = ''
     cd cymem/tests
     ${python.interpreter} -m unittest discover -p "*test*"
   '';
-  
+
   meta = with stdenv.lib; {
     description = "Cython memory pool for RAII-style memory management";
     homepage = https://github.com/explosion/cymem;
diff --git a/pkgs/development/python-modules/django-hijack/default.nix b/pkgs/development/python-modules/django-hijack/default.nix
index 8eb98924491a..b779d01c9353 100644
--- a/pkgs/development/python-modules/django-hijack/default.nix
+++ b/pkgs/development/python-modules/django-hijack/default.nix
@@ -2,8 +2,9 @@
   django, django_compat, django_nose
 }:
 buildPythonPackage rec {
-  name = "django-hijack-${version}";
+  pname = "django-hijack";
   version = "2.1.4";
+  name = pname + "-" + version;
 
   # the pypi packages don't include everything required for the tests
   src = fetchFromGitHub {
@@ -36,4 +37,4 @@ buildPythonPackage rec {
     license = licenses.mit;
     maintainers = with maintainers; [ ris ];
   };
-}
\ No newline at end of file
+}
diff --git a/pkgs/development/python-modules/dkimpy/default.nix b/pkgs/development/python-modules/dkimpy/default.nix
index 30baed39bd6f..91d5a17960d8 100644
--- a/pkgs/development/python-modules/dkimpy/default.nix
+++ b/pkgs/development/python-modules/dkimpy/default.nix
@@ -2,10 +2,11 @@
 , pytest, dns }:
 
 buildPythonApplication rec {
-  name = "${pname}-${majorversion}.${minorversion}";
+  name = "${pname}-${version}";
   pname = "dkimpy";
   majorversion = "0.6";
   minorversion = "2";
+  version = "${majorversion}.${minorversion}";
 
   src = fetchurl {
     url = "https://launchpad.net/${pname}/${majorversion}/${majorversion}.${minorversion}/+download/${name}.tar.gz";
diff --git a/pkgs/development/python-modules/first/default.nix b/pkgs/development/python-modules/first/default.nix
index 5ecbff90442d..16c1d79d767a 100644
--- a/pkgs/development/python-modules/first/default.nix
+++ b/pkgs/development/python-modules/first/default.nix
@@ -1,10 +1,9 @@
 { stdenv, buildPythonPackage, fetchPypi }:
-let
+
+buildPythonPackage rec {
   pname = "first";
   version = "2.0.1";
-in
-buildPythonPackage {
-  name = "${pname}-${version}";
+  name = pname + "-" + version;
 
   src = fetchPypi {
     inherit pname version;
diff --git a/pkgs/development/python-modules/geopandas/default.nix b/pkgs/development/python-modules/geopandas/default.nix
index f8f54e0e4294..cab25a60f3b4 100644
--- a/pkgs/development/python-modules/geopandas/default.nix
+++ b/pkgs/development/python-modules/geopandas/default.nix
@@ -3,8 +3,9 @@
 , pytest }:
 
 buildPythonPackage rec {
-  name = "geopandas-${version}";
+  pname = "geopandas";
   version = "0.3.0";
+  name = pname + "-" + version;
 
   src = fetchFromGitHub {
     owner = "geopandas";
diff --git a/pkgs/development/python-modules/gevent/default.nix b/pkgs/development/python-modules/gevent/default.nix
index 8a3d3b3d09b7..6b94652402e3 100644
--- a/pkgs/development/python-modules/gevent/default.nix
+++ b/pkgs/development/python-modules/gevent/default.nix
@@ -1,20 +1,15 @@
 { stdenv, fetchurl, buildPythonPackage, isPyPy, python, libev, greenlet }:
 
 buildPythonPackage rec {
-  name = "gevent-1.1.2";
+  pname = "gevent";
+  version = "1.2.2";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/g/gevent/${name}.tar.gz";
-    sha256 = "cb15cf73d69a2eeefed330858f09634e2c50bf46da9f9e7635730fcfb872c02c";
+    sha256 = "0bbbjvi423y9k9xagrcsimnayaqymg6f2dj76m9z3mjpkjpci4a7";
   };
 
-  # Why do we have this patch?
-  postPatch = ''
-    substituteInPlace libev/ev.c --replace \
-      "ecb_inline void ecb_unreachable (void) ecb_noreturn" \
-      "ecb_inline ecb_noreturn void ecb_unreachable (void)"
-  '';
-
   buildInputs = [ libev ];
   propagatedBuildInputs = stdenv.lib.optionals (!isPyPy) [ greenlet ];
 
diff --git a/pkgs/development/python-modules/gflags/default.nix b/pkgs/development/python-modules/gflags/default.nix
index f73ff2b4686d..6fe4b7fcab87 100644
--- a/pkgs/development/python-modules/gflags/default.nix
+++ b/pkgs/development/python-modules/gflags/default.nix
@@ -2,7 +2,8 @@
 
 buildPythonPackage rec {
   version = "3.1.2";
-  name = "gflags-${version}";
+  pname = "gflags";
+  name = pname + "-" + version;
 
   src = fetchPypi {
     inherit version;
diff --git a/pkgs/development/python-modules/hmmlearn/default.nix b/pkgs/development/python-modules/hmmlearn/default.nix
index eeb042452155..3295786bd08c 100644
--- a/pkgs/development/python-modules/hmmlearn/default.nix
+++ b/pkgs/development/python-modules/hmmlearn/default.nix
@@ -1,8 +1,9 @@
 { lib, fetchurl, buildPythonPackage, numpy }:
 
 buildPythonPackage rec {
-  name = "hmmlearn-${version}";
+  pname = "hmmlearn";
   version = "0.2.0";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/h/hmmlearn/${name}.tar.gz";
diff --git a/pkgs/development/python-modules/hyperlink/default.nix b/pkgs/development/python-modules/hyperlink/default.nix
index ca09c271ddac..b485745cbbb8 100644
--- a/pkgs/development/python-modules/hyperlink/default.nix
+++ b/pkgs/development/python-modules/hyperlink/default.nix
@@ -1,7 +1,9 @@
 { stdenv, buildPythonPackage, fetchurl, pytest }:
+
 buildPythonPackage rec {
-  name = "hyperlink-${version}";
+  pname = "hyperlink";
   version = "17.3.0";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/h/hyperlink/${name}.tar.gz";
diff --git a/pkgs/development/python-modules/keystoneclient/default.nix b/pkgs/development/python-modules/keystoneclient/default.nix
index 5b09992295f7..a856f4db793f 100644
--- a/pkgs/development/python-modules/keystoneclient/default.nix
+++ b/pkgs/development/python-modules/keystoneclient/default.nix
@@ -9,8 +9,9 @@
 }:
 
 buildPythonPackage rec {
-  name = "keystoneclient-${version}";
+  pname = "keystoneclient";
   version = "1.8.1";
+  name = pname + "-" + version;
 
   src = fetchFromGitHub {
     owner = "openstack";
diff --git a/pkgs/development/python-modules/keyutils/default.nix b/pkgs/development/python-modules/keyutils/default.nix
index 2746f1616682..04b9e9235750 100644
--- a/pkgs/development/python-modules/keyutils/default.nix
+++ b/pkgs/development/python-modules/keyutils/default.nix
@@ -1,9 +1,8 @@
 { lib, buildPythonPackage, fetchurl, pkgs, pytestrunner }:
 
-let
+buildPythonPackage rec {
   pname = "keyutils";
   version = "0.5";
-in buildPythonPackage rec {
   name = "${pname}-${version}";
 
   src = fetchurl {
diff --git a/pkgs/development/python-modules/libgpuarray/default.nix b/pkgs/development/python-modules/libgpuarray/default.nix
index 3c24c2ed24cb..67353a32ada6 100644
--- a/pkgs/development/python-modules/libgpuarray/default.nix
+++ b/pkgs/development/python-modules/libgpuarray/default.nix
@@ -1,4 +1,4 @@
-{ stdenv 
+{ stdenv
 , lib
 , buildPythonPackage
 , fetchFromGitHub
@@ -11,18 +11,19 @@
 , python
 , cudaSupport ? false, cudatoolkit
 , openclSupport ? true, ocl-icd, clblas
-}: 
+}:
 
 buildPythonPackage rec {
-  name = "libgpuarray-${version}";
+  pname = "libgpuarray";
   version = "0.6.9";
+  name = pname + "-" + version;
 
   src = fetchFromGitHub {
-    owner = "Theano"; 
+    owner = "Theano";
     repo = "libgpuarray";
     rev = "v${version}";
     sha256 = "06z47ls42a37gbv0x7f3l1qvils7q0hvy02s95l530klgibp19s0";
-  }; 
+  };
 
   # requires a GPU
   doCheck = false;
@@ -43,7 +44,7 @@ buildPythonPackage rec {
     export NIX_CFLAGS_COMPILE="-L $out/lib -I $out/include $NIX_CFLAGS_COMPILE"
 
     cd ..
-  ''; 
+  '';
 
   postFixup = ''
     rm $out/lib/libgpuarray-static.a
@@ -64,11 +65,11 @@ buildPythonPackage rec {
 
   enableParallelBuilding = true;
 
-  buildInputs = [ 
-    cmake 
-    cython 
+  buildInputs = [
+    cmake
+    cython
     nose
-  ]; 
+  ];
 
   meta = with stdenv.lib; {
     homepage = "https://github.com/Theano/libgpuarray";
diff --git a/pkgs/development/python-modules/llfuse/default.nix b/pkgs/development/python-modules/llfuse/default.nix
index 7c907d1e5ef3..4c4c89d8f196 100644
--- a/pkgs/development/python-modules/llfuse/default.nix
+++ b/pkgs/development/python-modules/llfuse/default.nix
@@ -3,7 +3,9 @@
 }:
 
 buildPythonPackage rec {
-  name = "llfuse-1.0";
+  pname = "llfuse";
+  version = "1.0";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/l/llfuse/${name}.tar.bz2";
diff --git a/pkgs/development/python-modules/locustio/default.nix b/pkgs/development/python-modules/locustio/default.nix
new file mode 100644
index 000000000000..c3eb5da0ae02
--- /dev/null
+++ b/pkgs/development/python-modules/locustio/default.nix
@@ -0,0 +1,32 @@
+{ buildPythonPackage
+, fetchPypi
+, mock
+, unittest2
+, msgpack
+, requests
+, flask
+, gevent
+, pyzmq
+}:
+
+buildPythonPackage rec {
+  pname = "locustio";
+  version = "0.8";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0y3r2g31z7g120c7v91zdvcakwfxv2acbgs4flarv5yza2knl11c";
+  };
+
+  patchPhase = ''
+    sed -i s/"pyzmq=="/"pyzmq>="/ setup.py
+  '';
+
+  propagatedBuildInputs = [ msgpack requests flask gevent pyzmq ];
+  buildInputs = [ mock unittest2 ];
+
+  meta = {
+    homepage = http://locust.io/;
+    description = "A load testing tool";
+  };
+}
diff --git a/pkgs/development/python-modules/murmurhash/default.nix b/pkgs/development/python-modules/murmurhash/default.nix
index aa5e3358866d..023c94cdc8ea 100644
--- a/pkgs/development/python-modules/murmurhash/default.nix
+++ b/pkgs/development/python-modules/murmurhash/default.nix
@@ -6,25 +6,26 @@
 }:
 
 buildPythonPackage rec {
-  name = "murmurhash-${version}";
+  pname = "murmurhash";
   version = "0.26.4";
-  
+  name = pname + "-" + version;
+
   src = fetchFromGitHub {
     owner = "explosion";
     repo = "murmurhash";
     rev = "0.26.4";
-    sha256 = "0n2j0glhlv2yh3fjgbg4d79j1c1fpchgjd4vnpw908l9mzchhmdv";    
+    sha256 = "0n2j0glhlv2yh3fjgbg4d79j1c1fpchgjd4vnpw908l9mzchhmdv";
   };
 
   buildInputs = [
    cython
   ];
-  
+
   checkPhase = ''
     cd murmurhash/tests
     ${python.interpreter} -m unittest discover -p "*test*"
   '';
-  
+
   meta = with stdenv.lib; {
     description = "Cython bindings for MurmurHash2";
     homepage = https://github.com/explosion/murmurhash;
diff --git a/pkgs/development/python-modules/nilearn/default.nix b/pkgs/development/python-modules/nilearn/default.nix
index f5dc7607e2d2..16036a691791 100644
--- a/pkgs/development/python-modules/nilearn/default.nix
+++ b/pkgs/development/python-modules/nilearn/default.nix
@@ -4,7 +4,7 @@
 buildPythonPackage rec {
   pname = "nilearn";
   version = "0.3.1";
-  name = "nilearn-${version}";
+  name = pname + "-" + version;
 
   src = fetchPypi {
     inherit pname version;
diff --git a/pkgs/development/python-modules/nwdiag/default.nix b/pkgs/development/python-modules/nwdiag/default.nix
index ebf7ce944c11..5d9b4c665c50 100644
--- a/pkgs/development/python-modules/nwdiag/default.nix
+++ b/pkgs/development/python-modules/nwdiag/default.nix
@@ -3,7 +3,9 @@
 }:
 
 buildPythonPackage rec {
-  name = "nwdiag-1.0.3";
+  pname = "nwdiag";
+  version = "1.0.3";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/n/nwdiag/${name}.tar.gz";
diff --git a/pkgs/development/python-modules/path.py/default.nix b/pkgs/development/python-modules/path.py/default.nix
index 3178b217a00a..6b4af3ffcd48 100644
--- a/pkgs/development/python-modules/path.py/default.nix
+++ b/pkgs/development/python-modules/path.py/default.nix
@@ -10,7 +10,7 @@
 buildPythonPackage rec {
   pname = "path.py";
   version = "10.4";
-  name = "path.py-${version}";
+  name = pname + "-" + version;
 
   src = fetchPypi {
     inherit pname version;
@@ -31,4 +31,4 @@ buildPythonPackage rec {
   checkPhase = ''
     py.test test_path.py
   '';
-}
\ No newline at end of file
+}
diff --git a/pkgs/development/python-modules/pip-tools/default.nix b/pkgs/development/python-modules/pip-tools/default.nix
index eed891c6f577..8579e62ec1e0 100644
--- a/pkgs/development/python-modules/pip-tools/default.nix
+++ b/pkgs/development/python-modules/pip-tools/default.nix
@@ -4,7 +4,7 @@
 buildPythonPackage rec {
   pname = "pip-tools";
   version = "1.10.1";
-  name = "pip-tools-${version}";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/p/pip-tools/${name}.tar.gz";
diff --git a/pkgs/development/python-modules/powerline/default.nix b/pkgs/development/python-modules/powerline/default.nix
index 028d81d2934f..f51c6989c011 100644
--- a/pkgs/development/python-modules/powerline/default.nix
+++ b/pkgs/development/python-modules/powerline/default.nix
@@ -12,10 +12,12 @@
 # the executables of git, mercurial and bazaar.
 
 buildPythonPackage rec {
-  rev  = "2.6";
-  name = "powerline-${rev}";
+  version  = "2.6";
+  pname = "powerline";
+  name = pname + "-" + version;
+
   src = fetchurl {
-    url    = "https://github.com/powerline/powerline/archive/${rev}.tar.gz";
+    url    = "https://github.com/powerline/powerline/archive/${version}.tar.gz";
     name   = "${name}.tar.gz";
     sha256 = "c108f11fe10dc910febb94b87d3abded85d4363fb950366a9e30282b9ba7c272";
   };
diff --git a/pkgs/development/python-modules/protobuf/default.nix b/pkgs/development/python-modules/protobuf/default.nix
index 4a67a3132eda..1a345b19ef94 100644
--- a/pkgs/development/python-modules/protobuf/default.nix
+++ b/pkgs/development/python-modules/protobuf/default.nix
@@ -5,7 +5,7 @@
 with stdenv.lib;
 
 buildPythonPackage rec {
-  inherit (protobuf) name src;
+  inherit (protobuf) name src version;
   inherit disabled doCheck;
 
   NIX_CFLAGS_COMPILE =
diff --git a/pkgs/development/python-modules/psutil/default.nix b/pkgs/development/python-modules/psutil/default.nix
new file mode 100644
index 000000000000..cf9b3ea267f5
--- /dev/null
+++ b/pkgs/development/python-modules/psutil/default.nix
@@ -0,0 +1,28 @@
+{ stdenv
+, buildPythonPackage
+, fetchPypi
+, darwin
+, mock
+}:
+
+buildPythonPackage rec {
+  pname = "psutil";
+  version = "5.4.1";
+  name = "${pname}-${version}";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "42e2de159e3c987435cb3b47d6f37035db190a1499f3af714ba7af5c379b6ba2";
+  };
+
+  # No tests in archive
+  doCheck = false;
+
+  buildInputs = [] ++ stdenv.lib.optionals stdenv.isDarwin [ darwin.IOKit ];
+
+  meta = {
+    description = "Process and system utilization information interface for python";
+    homepage = https://github.com/giampaolo/psutil;
+    license = stdenv.lib.licenses.bsd3;
+  };
+}
diff --git a/pkgs/development/python-modules/pwntools/default.nix b/pkgs/development/python-modules/pwntools/default.nix
index 57f7c2c317dc..11f80ca3b2e8 100644
--- a/pkgs/development/python-modules/pwntools/default.nix
+++ b/pkgs/development/python-modules/pwntools/default.nix
@@ -7,7 +7,7 @@
 buildPythonPackage rec {
   version = "3.10.0";
   pname = "pwntools";
-  name = "pwntools-${version}";
+  name = pname + "-" + version;
 
   src = fetchPypi {
     inherit pname version;
diff --git a/pkgs/development/python-modules/pyGithub/default.nix b/pkgs/development/python-modules/pyGithub/default.nix
index 45887bdc748d..ec8db1c5bc3d 100644
--- a/pkgs/development/python-modules/pyGithub/default.nix
+++ b/pkgs/development/python-modules/pyGithub/default.nix
@@ -3,8 +3,9 @@
 , buildPythonPackage, python-jose }:
 
 buildPythonPackage rec {
-  name = "PyGithub-${version}";
+  pname = "PyGithub";
   version = "1.32";
+  name = pname + "-" + version;
 
   src = fetchFromGitHub {
     owner = "PyGithub";
diff --git a/pkgs/development/python-modules/pychromecast/default.nix b/pkgs/development/python-modules/pychromecast/default.nix
index 440a1aa7785e..01014170dc7d 100644
--- a/pkgs/development/python-modules/pychromecast/default.nix
+++ b/pkgs/development/python-modules/pychromecast/default.nix
@@ -1,8 +1,9 @@
 { lib, fetchurl, buildPythonPackage, requests, six, zeroconf, protobuf }:
 
 buildPythonPackage rec {
-  name    = "PyChromecast-${version}";
+  pname = "PyChromecast";
   version = "0.8.1";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url    = "mirror://pypi/p/pychromecast/${name}.tar.gz";
diff --git a/pkgs/development/python-modules/pycrypto/default.nix b/pkgs/development/python-modules/pycrypto/default.nix
index 4669c05a7d56..1ecf0bf6b339 100644
--- a/pkgs/development/python-modules/pycrypto/default.nix
+++ b/pkgs/development/python-modules/pycrypto/default.nix
@@ -3,10 +3,9 @@
 # This is a dummy package providing the drop-in replacement pycryptodome.
 # https://github.com/NixOS/nixpkgs/issues/21671
 
-let
+buildPythonPackage rec {
   version = pycryptodome.version;
   pname = "pycrypto";
-in buildPythonPackage rec {
   name = "${pname}-${version}";
 
   # Cannot build wheel otherwise (zip 1980 issue)
diff --git a/pkgs/development/python-modules/pycuda/compyte.nix b/pkgs/development/python-modules/pycuda/compyte.nix
index 50bd81ac462c..192d60cec46a 100644
--- a/pkgs/development/python-modules/pycuda/compyte.nix
+++ b/pkgs/development/python-modules/pycuda/compyte.nix
@@ -1,10 +1,11 @@
-{ mkDerivation 
+{ mkDerivation
 , fetchFromGitHub
 }:
 
 mkDerivation rec {
-  name = "compyte-${version}";
-  version = "git-20150817"; 
+  pname = "compyte";
+  version = "git-20150817";
+  name = pname + "-" + version;
 
   src = fetchFromGitHub {
     owner = "inducer";
@@ -13,7 +14,7 @@ mkDerivation rec {
     sha256 = "1980h017qi52b7fqwm75m481xs2napgdd3fbrzkfc29k085cbign";
   };
 
-  installPhase = '' 
+  installPhase = ''
     mkdir -p $out
     cp -r * $out
   '';
diff --git a/pkgs/development/python-modules/pyev/default.nix b/pkgs/development/python-modules/pyev/default.nix
index db06fedd68cc..e393265ae37f 100644
--- a/pkgs/development/python-modules/pyev/default.nix
+++ b/pkgs/development/python-modules/pyev/default.nix
@@ -1,7 +1,9 @@
 { stdenv, fetchurl, buildPythonPackage, libev }:
 
 buildPythonPackage rec {
-  name = "pyev-0.9.0";
+  pname = "pyev";
+  version = "0.9.0";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/p/pyev/${name}.tar.gz";
diff --git a/pkgs/development/python-modules/pyftgl/default.nix b/pkgs/development/python-modules/pyftgl/default.nix
index a02aa94576e5..117169a26121 100644
--- a/pkgs/development/python-modules/pyftgl/default.nix
+++ b/pkgs/development/python-modules/pyftgl/default.nix
@@ -2,12 +2,14 @@
 , boost, freetype, ftgl, mesa }:
 
 buildPythonPackage rec {
-  name = "pyftgl-0.4b";
+  pname = "pyftgl";
+  version = "0.4b";
+  name = pname + "-" + version;
 
   src = fetchFromGitHub {
     owner = "umlaeute";
-    repo = "pyftgl";
-    rev = "0.4b";
+    repo = name;
+    rev = version;
     sha256 = "12zcjv4cwwjihiaf74kslrdmmk4bs47h7006gyqfwdfchfjdgg4r";
   };
 
diff --git a/pkgs/development/python-modules/pygame/git.nix b/pkgs/development/python-modules/pygame/git.nix
index 97f7b8b6c993..1d8ba697f38b 100644
--- a/pkgs/development/python-modules/pygame/git.nix
+++ b/pkgs/development/python-modules/pygame/git.nix
@@ -3,8 +3,9 @@
 }:
 
 buildPythonPackage rec {
-  name = "pygame-${version}";
+  pname = "pygame";
   version = "2016-05-17";
+  name = pname + "-" + version;
 
   src = fetchFromBitbucket {
     owner = "pygame";
diff --git a/pkgs/development/python-modules/pygobject/3.nix b/pkgs/development/python-modules/pygobject/3.nix
index 6afd10596bc6..db734c53007b 100644
--- a/pkgs/development/python-modules/pygobject/3.nix
+++ b/pkgs/development/python-modules/pygobject/3.nix
@@ -3,8 +3,10 @@
 buildPythonPackage rec {
   major = "3.24";
   minor = "1";
-  name = "pygobject-${major}.${minor}";
+  version = "${major}.${minor}";
   format = "other";
+  pname = "pygobject";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://gnome/sources/pygobject/${major}/${name}.tar.xz";
diff --git a/pkgs/development/python-modules/pygobject/default.nix b/pkgs/development/python-modules/pygobject/default.nix
index 63a21cb2befd..796fc992a7dc 100644
--- a/pkgs/development/python-modules/pygobject/default.nix
+++ b/pkgs/development/python-modules/pygobject/default.nix
@@ -1,9 +1,10 @@
 { stdenv, fetchurl, python, buildPythonPackage, pkgconfig, glib }:
 
 buildPythonPackage rec {
-  name = "pygobject-${version}";
+  pname = "pygobject";
   version = "2.28.6";
   format = "other";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://gnome/sources/pygobject/2.28/${name}.tar.xz";
diff --git a/pkgs/development/python-modules/pygtk/default.nix b/pkgs/development/python-modules/pygtk/default.nix
index 9b9adc64b755..42127de2f244 100644
--- a/pkgs/development/python-modules/pygtk/default.nix
+++ b/pkgs/development/python-modules/pygtk/default.nix
@@ -2,7 +2,9 @@
 , buildPythonPackage, libglade ? null, isPy3k }:
 
 buildPythonPackage rec {
-  name = "pygtk-2.24.0";
+  pname = "pygtk";
+  version = "2.24.0";
+  name = pname + "-" + version;
 
   disabled = isPy3k;
 
diff --git a/pkgs/development/python-modules/pygtksourceview/default.nix b/pkgs/development/python-modules/pygtksourceview/default.nix
index 7b89e6d1b28c..a03be0ac04df 100644
--- a/pkgs/development/python-modules/pygtksourceview/default.nix
+++ b/pkgs/development/python-modules/pygtksourceview/default.nix
@@ -1,10 +1,10 @@
 { lib, fetchurl, python, buildPythonPackage, pkgconfig, pygobject2, glib, pygtk, gnome2 }:
 
-let version = "2.10.1"; in
-
-buildPythonPackage {
-  name = "pygtksourceview-${version}";
+buildPythonPackage rec {
+  pname = "pygtksourceview";
   format = "other";
+  version = "2.10.1";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "http://ftp.gnome.org/pub/gnome/sources/pygtksourceview/2.10/pygtksourceview-${version}.tar.bz2";
diff --git a/pkgs/development/python-modules/pyocr/default.nix b/pkgs/development/python-modules/pyocr/default.nix
index 54caba10189e..e253e64a41ca 100644
--- a/pkgs/development/python-modules/pyocr/default.nix
+++ b/pkgs/development/python-modules/pyocr/default.nix
@@ -3,8 +3,9 @@
 }:
 
 buildPythonPackage rec {
-  name = "pyocr-${version}";
+  pname = "pyocr";
   version = "0.4.7";
+  name = pname + "-" + version;
 
   # Don't fetch from PYPI because it doesn't contain tests.
   src = fetchFromGitHub {
diff --git a/pkgs/development/python-modules/pyqt/4.x.nix b/pkgs/development/python-modules/pyqt/4.x.nix
index b4376730e623..0efb77d27b3e 100644
--- a/pkgs/development/python-modules/pyqt/4.x.nix
+++ b/pkgs/development/python-modules/pyqt/4.x.nix
@@ -1,10 +1,14 @@
 { stdenv, fetchurl, pythonPackages, qt4, pkgconfig, lndir, dbus_libs, makeWrapper }:
 
 let
+  pname = "PyQt-x11-gpl";
   version = "4.12";
+
   inherit (pythonPackages) buildPythonPackage python dbus-python sip;
 in buildPythonPackage {
-  name = "PyQt-x11-gpl-${version}";
+  pname = pname;
+  name = pname + "-" + version;
+  version = version;
   format = "other";
 
   src = fetchurl {
diff --git a/pkgs/development/python-modules/pyqt/5.x.nix b/pkgs/development/python-modules/pyqt/5.x.nix
index e0c3163429c3..dc5c964caf6d 100644
--- a/pkgs/development/python-modules/pyqt/5.x.nix
+++ b/pkgs/development/python-modules/pyqt/5.x.nix
@@ -5,11 +5,15 @@
 }:
 
 let
+  pname = "PyQt";
   version = "5.9";
+
   inherit (pythonPackages) buildPythonPackage python dbus-python sip;
 in buildPythonPackage {
-  name = "PyQt-${version}";
+  pname = pname;
+  version = version;
   format = "other";
+  name = pname + "-" + version;
 
   meta = with lib; {
     description = "Python bindings for Qt5";
diff --git a/pkgs/development/python-modules/pyro/default.nix b/pkgs/development/python-modules/pyro/default.nix
index dbad83bef7e7..3e2f90aa9d30 100644
--- a/pkgs/development/python-modules/pyro/default.nix
+++ b/pkgs/development/python-modules/pyro/default.nix
@@ -1,7 +1,10 @@
 { stdenv, fetchurl, buildPythonPackage, isPy3k }:
 
 buildPythonPackage rec {
-  name = "Pyro-3.16";
+  pname = "Pyro";
+  version = "3.16";
+  name = pname + "-" + version;
+
   disabled = isPy3k;
 
   src = fetchurl {
diff --git a/pkgs/development/python-modules/pyslurm/default.nix b/pkgs/development/python-modules/pyslurm/default.nix
index 3a563e5d183d..e855b952f276 100644
--- a/pkgs/development/python-modules/pyslurm/default.nix
+++ b/pkgs/development/python-modules/pyslurm/default.nix
@@ -1,7 +1,9 @@
 { lib, fetchFromGitHub, buildPythonPackage, cython, slurm }:
 
 buildPythonPackage rec {
-  name = "pyslurm";
+  pname = "pyslurm";
+  version = "unstable-69e4f4f";
+  name = pname + "-" + version;
 
   src = fetchFromGitHub {
     repo = "pyslurm";
diff --git a/pkgs/development/python-modules/pysoundfile/default.nix b/pkgs/development/python-modules/pysoundfile/default.nix
index fe24f0203f0d..ef67ed85cc03 100644
--- a/pkgs/development/python-modules/pysoundfile/default.nix
+++ b/pkgs/development/python-modules/pysoundfile/default.nix
@@ -11,8 +11,8 @@
 
 buildPythonPackage rec {
   pname = "PySoundFile";
-  name = "PySoundFile-${version}";
   version = "0.8.1";
+  name = pname + "-" + version;
 
   src = fetchPypi {
     inherit pname version;
@@ -35,4 +35,4 @@ buildPythonPackage rec {
 
     # https://github.com/bastibe/PySoundFile/issues/157
     disabled = isPyPy ||  stdenv.isi686;
-}
\ No newline at end of file
+}
diff --git a/pkgs/development/python-modules/pytest-expect/default.nix b/pkgs/development/python-modules/pytest-expect/default.nix
index 5abfd9423ac7..b23ae051ad8d 100644
--- a/pkgs/development/python-modules/pytest-expect/default.nix
+++ b/pkgs/development/python-modules/pytest-expect/default.nix
@@ -6,10 +6,9 @@
 , six
 }:
 
-let
+buildPythonPackage rec {
   pname = "pytest-expect";
   version = "1.1.0";
-in buildPythonPackage rec {
   name = "${pname}-${version}";
 
   src = fetchurl {
@@ -28,4 +27,4 @@ in buildPythonPackage rec {
     homepage = https://github.com/gsnedders/pytest-expect;
     license = lib.licenses.mit;
   };
-}
\ No newline at end of file
+}
diff --git a/pkgs/development/python-modules/pytest/2_7.nix b/pkgs/development/python-modules/pytest/2_7.nix
index adaa640fdbe6..e63c3f5ebbd6 100644
--- a/pkgs/development/python-modules/pytest/2_7.nix
+++ b/pkgs/development/python-modules/pytest/2_7.nix
@@ -1,6 +1,8 @@
 { stdenv, pkgs, buildPythonPackage, fetchurl, isPy26, argparse, py, selenium }:
 buildPythonPackage rec {
-  name = "pytest-2.7.3";
+  pname = "pytest";
+  version = "2.7.3";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/p/pytest/${name}.tar.gz";
diff --git a/pkgs/development/python-modules/pytest/2_8.nix b/pkgs/development/python-modules/pytest/2_8.nix
index 6232ccaf7006..963154b11ce1 100644
--- a/pkgs/development/python-modules/pytest/2_8.nix
+++ b/pkgs/development/python-modules/pytest/2_8.nix
@@ -1,6 +1,8 @@
 { stdenv, pkgs, buildPythonPackage, fetchurl, isPy26, argparse, py, selenium }:
 buildPythonPackage rec {
-  name = "pytest-2.8.7";
+  pname = "pytest";
+  version = "2.8.7";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/p/pytest/${name}.tar.gz";
diff --git a/pkgs/development/python-modules/pytest/2_9.nix b/pkgs/development/python-modules/pytest/2_9.nix
index 3ca7120dd92c..2d28517441b0 100644
--- a/pkgs/development/python-modules/pytest/2_9.nix
+++ b/pkgs/development/python-modules/pytest/2_9.nix
@@ -1,6 +1,8 @@
 { stdenv, pkgs, buildPythonPackage, fetchurl, isPy26, argparse, py, selenium }:
 buildPythonPackage rec {
-  name = "pytest-2.9.2";
+  pname = "pytest";
+  version = "2.9.2";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/p/pytest/${name}.tar.gz";
diff --git a/pkgs/development/python-modules/python-utils/default.nix b/pkgs/development/python-modules/python-utils/default.nix
index 6acd0934f471..37c15c07537e 100644
--- a/pkgs/development/python-modules/python-utils/default.nix
+++ b/pkgs/development/python-modules/python-utils/default.nix
@@ -1,8 +1,9 @@
 { lib, buildPythonPackage, fetchFromGitHub, pytest, pytestrunner, pytestcov, pytestflakes, pytestpep8, sphinx, six }:
 
 buildPythonPackage rec {
-  name = "python-utils-${version}";
+  pname = "python-utils";
   version = "2.2.0";
+  name = pname + "-" + version;
 
   src = fetchFromGitHub {
     owner = "WoLpH";
diff --git a/pkgs/development/python-modules/python_fedora/default.nix b/pkgs/development/python-modules/python_fedora/default.nix
index 7ab698ecd084..e7c3630f42f4 100644
--- a/pkgs/development/python-modules/python_fedora/default.nix
+++ b/pkgs/development/python-modules/python_fedora/default.nix
@@ -4,7 +4,7 @@
 buildPythonPackage rec {
   pname = "python-fedora";
   version = "0.9.0";
-  name = "python-fedora-${version}";
+  name = pname + "-" + version;
 
   src = fetchPypi {
     inherit pname version;
diff --git a/pkgs/development/python-modules/rackspace-novaclient/default.nix b/pkgs/development/python-modules/rackspace-novaclient/default.nix
index 144b61c9b9a5..3993503e9562 100644
--- a/pkgs/development/python-modules/rackspace-novaclient/default.nix
+++ b/pkgs/development/python-modules/rackspace-novaclient/default.nix
@@ -1,7 +1,9 @@
 { buildPythonPackage, fetchurl, isPy3k, requests, novaclient, six, lib }:
 let
 os-virtual-interfacesv2-python-novaclient-ext = buildPythonPackage rec {
-  name = "os_virtual_interfacesv2_python_novaclient_ext-0.20";
+  pname = "os_virtual_interfacesv2_python_novaclient_ext";
+  version = "0.20";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/o/os-virtual-interfacesv2-python-novaclient-ext/${name}.tar.gz";
@@ -18,7 +20,9 @@ os-virtual-interfacesv2-python-novaclient-ext = buildPythonPackage rec {
 };
 
 ip-associations-python-novaclient-ext = buildPythonPackage rec {
-  name = "ip_associations_python_novaclient_ext-0.2";
+  pname = "ip_associations_python_novaclient_ext";
+  version = "0.2";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/i/ip_associations_python_novaclient_ext/${name}.tar.gz";
@@ -34,9 +38,10 @@ ip-associations-python-novaclient-ext = buildPythonPackage rec {
   };
 };
 
-
 rackspace-auth-openstack = buildPythonPackage rec {
-  name = "rackspace-auth-openstack-1.3";
+  pname = "rackspace-auth-openstack";
+  version = "1.3";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/r/rackspace-auth-openstack/${name}.tar.gz";
@@ -52,7 +57,9 @@ rackspace-auth-openstack = buildPythonPackage rec {
   };
 };
 rax-default-network-flags-python-novaclient-ext = buildPythonPackage rec {
-  name = "rax_default_network_flags_python_novaclient_ext-0.4.0";
+  pname = "rax_default_network_flags_python_novaclient_ext";
+  version = "0.4.0";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/r/rax_default_network_flags_python_novaclient_ext/${name}.tar.gz";
@@ -68,7 +75,9 @@ rax-default-network-flags-python-novaclient-ext = buildPythonPackage rec {
   };
 };
 os-networksv2-python-novaclient-ext = buildPythonPackage rec {
-  name = "os_networksv2_python_novaclient_ext-0.26";
+  pname = "os_networksv2_python_novaclient_ext";
+  version = "0.26";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/o/os_networksv2_python_novaclient_ext/${name}.tar.gz";
@@ -85,7 +94,9 @@ os-networksv2-python-novaclient-ext = buildPythonPackage rec {
 };
 
 rax-scheduled-images-python-novaclient-ext = buildPythonPackage rec {
-  name = "rax_scheduled_images_python_novaclient_ext-0.3.1";
+  pname = "rax_scheduled_images_python_novaclient_ext";
+  version = "0.3.1";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/r/rax_scheduled_images_python_novaclient_ext/${name}.tar.gz";
@@ -102,7 +113,9 @@ rax-scheduled-images-python-novaclient-ext = buildPythonPackage rec {
 };
 
 os-diskconfig-python-novaclient-ext = buildPythonPackage rec {
-  name = "os_diskconfig_python_novaclient_ext-0.1.3";
+  pname = "os_diskconfig_python_novaclient_ext";
+  version = "0.1.3";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/o/os_diskconfig_python_novaclient_ext/${name}.tar.gz";
@@ -120,7 +133,9 @@ os-diskconfig-python-novaclient-ext = buildPythonPackage rec {
 
 in
 buildPythonPackage rec {
-  name = "rackspace-novaclient-2.1";
+  pname = "rackspace-novaclient";
+  version = "2.1";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/r/rackspace-novaclient/${name}.tar.gz";
diff --git a/pkgs/development/python-modules/raven/default.nix b/pkgs/development/python-modules/raven/default.nix
index 00bc54d844b1..e7b56cb3f350 100644
--- a/pkgs/development/python-modules/raven/default.nix
+++ b/pkgs/development/python-modules/raven/default.nix
@@ -1,7 +1,9 @@
 { lib, buildPythonPackage, fetchurl, isPy3k, contextlib2 }:
 
 buildPythonPackage rec {
-  name = "raven-6.3.0";
+  pname = "raven";
+  version = "6.3.0";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/r/raven/${name}.tar.gz";
diff --git a/pkgs/development/python-modules/recursive-pth-loader/default.nix b/pkgs/development/python-modules/recursive-pth-loader/default.nix
index 9a17e722679f..359b482a1682 100644
--- a/pkgs/development/python-modules/recursive-pth-loader/default.nix
+++ b/pkgs/development/python-modules/recursive-pth-loader/default.nix
@@ -1,7 +1,9 @@
 { stdenv, python }:
 
 stdenv.mkDerivation rec {
-  name = "python-recursive-pth-loader-1.0";
+  pname = "python-recursive-pth-loader";
+  version = "1.0";
+  name = pname + "-" + version;
 
   unpackPhase = "true";
 
diff --git a/pkgs/development/python-modules/robomachine/default.nix b/pkgs/development/python-modules/robomachine/default.nix
index 1e7b020cd513..8f71bab9c250 100644
--- a/pkgs/development/python-modules/robomachine/default.nix
+++ b/pkgs/development/python-modules/robomachine/default.nix
@@ -1,7 +1,9 @@
 { stdenv, fetchurl, buildPythonPackage, pyparsing, argparse, robotframework }:
 
 buildPythonPackage rec {
-  name = "robomachine-0.6";
+  pname = "robomachine";
+  version = "0.6";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/R/RoboMachine/RoboMachine-0.6.tar.gz";
diff --git a/pkgs/development/python-modules/robotframework-ride/default.nix b/pkgs/development/python-modules/robotframework-ride/default.nix
index a9b536fc76ed..8bac32ba9112 100644
--- a/pkgs/development/python-modules/robotframework-ride/default.nix
+++ b/pkgs/development/python-modules/robotframework-ride/default.nix
@@ -2,8 +2,9 @@
 
 buildPythonPackage rec {
   version = "1.2.3";
-  name = "robotframework-ride-${version}";
+  pname = "robotframework-ride";
   disabled = isPy3k;
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "https://robotframework-ride.googlecode.com/files/${name}.tar.gz";
diff --git a/pkgs/development/python-modules/robotframework/default.nix b/pkgs/development/python-modules/robotframework/default.nix
index e0a05eb2e258..6a4a88670251 100644
--- a/pkgs/development/python-modules/robotframework/default.nix
+++ b/pkgs/development/python-modules/robotframework/default.nix
@@ -2,8 +2,9 @@
 
 buildPythonPackage rec {
   version = "3.0.2";
-  name = "robotframework-${version}";
+  pname = "robotframework";
   disabled = isPy3k;
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/r/robotframework/${name}.tar.gz";
diff --git a/pkgs/development/python-modules/scapy/default.nix b/pkgs/development/python-modules/scapy/default.nix
index 5241b632f122..6670394ac0bb 100644
--- a/pkgs/development/python-modules/scapy/default.nix
+++ b/pkgs/development/python-modules/scapy/default.nix
@@ -1,7 +1,9 @@
 { stdenv, fetchurl, buildPythonPackage, isPy3k, isPyPy }:
 
 buildPythonPackage rec {
-  name = "scapy-2.2.0";
+  pname = "scapy";
+  version = "2.2.0";
+  name = pname + "-" + version;
 
   disabled = isPy3k || isPyPy;
 
diff --git a/pkgs/development/python-modules/selenium/default.nix b/pkgs/development/python-modules/selenium/default.nix
index d33e86a3f079..6b64cd18b4fa 100644
--- a/pkgs/development/python-modules/selenium/default.nix
+++ b/pkgs/development/python-modules/selenium/default.nix
@@ -8,7 +8,10 @@
 }:
 
 buildPythonPackage rec {
-  name = "selenium-3.6.0";
+  pname = "selenium";
+  version = "3.6.0";
+  name = pname + "-" + version;
+
   src = fetchurl {
     url = "mirror://pypi/s/selenium/${name}.tar.gz";
     sha256 = "15qpvz0bdwjvpcj11fm0rw6r5inr66sqw89ww50l025sbhf04qwm";
@@ -47,4 +50,4 @@ buildPythonPackage rec {
     license = licenses.asl20;
     maintainers = with maintainers; [ jraygauthier ];
   };
-}
\ No newline at end of file
+}
diff --git a/pkgs/development/python-modules/seqdiag/default.nix b/pkgs/development/python-modules/seqdiag/default.nix
index 98a81873a718..02d1fe08d8da 100644
--- a/pkgs/development/python-modules/seqdiag/default.nix
+++ b/pkgs/development/python-modules/seqdiag/default.nix
@@ -3,7 +3,9 @@
 }:
 
 buildPythonPackage rec {
-  name = "seqdiag-0.9.4";
+  pname = "seqdiag";
+  version = "0.9.4";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/s/seqdiag/${name}.tar.gz";
diff --git a/pkgs/development/python-modules/spacy/default.nix b/pkgs/development/python-modules/spacy/default.nix
index 452f3f1d9234..40df45616e93 100644
--- a/pkgs/development/python-modules/spacy/default.nix
+++ b/pkgs/development/python-modules/spacy/default.nix
@@ -4,7 +4,7 @@
 , python
 , fetchPypi
 , fetchFromGitHub
-, pytest 
+, pytest
 , cython
 , cymem
 , preshed
@@ -28,20 +28,21 @@ let
     version = "2017.04.05";
 
     src = fetchPypi {
-      inherit pname version;      
+      inherit pname version;
       sha256 = "0c95gf3jzz8mv52lkgq0h7sbasjwvdhghm4s0phmy5k9sr78f4fq";
     };
   };
 in buildPythonPackage rec {
-  name = "spacy-${version}";
+  pname = "spacy";
   version = "1.8.2";
+  name = pname + "-" + version;
 
   src = fetchFromGitHub {
     owner = "explosion";
     repo = "spaCy";
     rev = "v${version}";
-    sha256 = "0v3bmmar31a6968y4wl0lmgnc3829l2mnwd8s959m4pqw1y1w648";    
-  };  
+    sha256 = "0v3bmmar31a6968y4wl0lmgnc3829l2mnwd8s959m4pqw1y1w648";
+  };
 
   propagatedBuildInputs = [
    cython
@@ -65,8 +66,8 @@ in buildPythonPackage rec {
   doCheck = false;
   # checkPhase = ''
   #   ${python.interpreter} -m pytest spacy/tests --vectors --models --slow
-  # '';  
-  
+  # '';
+
   meta = with stdenv.lib; {
     description = "Industrial-strength Natural Language Processing (NLP) with Python and Cython";
     homepage = https://github.com/explosion/spaCy;
diff --git a/pkgs/development/python-modules/sphfile/default.nix b/pkgs/development/python-modules/sphfile/default.nix
index 8c2351c981e9..189fa7c932da 100644
--- a/pkgs/development/python-modules/sphfile/default.nix
+++ b/pkgs/development/python-modules/sphfile/default.nix
@@ -1,8 +1,9 @@
 { lib, fetchurl, buildPythonPackage, numpy }:
 
 buildPythonPackage rec {
-  name = "sphfile-${version}";
+  pname = "sphfile";
   version = "1.0.0";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/s/sphfile/${name}.tar.gz";
diff --git a/pkgs/development/python-modules/spotipy/default.nix b/pkgs/development/python-modules/spotipy/default.nix
index ec73485193a5..c14b3cd770bb 100644
--- a/pkgs/development/python-modules/spotipy/default.nix
+++ b/pkgs/development/python-modules/spotipy/default.nix
@@ -2,8 +2,8 @@
 
 buildPythonPackage rec {
   pname = "spotipy";
-  name = "spotipy-${version}";
   version = "2.4.4";
+  name = pname + "-" + version;
 
   src = fetchPypi {
     inherit pname version;
diff --git a/pkgs/development/python-modules/sybase/default.nix b/pkgs/development/python-modules/sybase/default.nix
index df27172d8d49..51c80e0fa910 100644
--- a/pkgs/development/python-modules/sybase/default.nix
+++ b/pkgs/development/python-modules/sybase/default.nix
@@ -6,8 +6,9 @@
 }:
 
 buildPythonPackage rec {
-  name = "python-sybase-${version}";
+  pname = "python-sybase";
   version = "0.40pre2";
+  name = pname + "-" + version;
   disabled = isPy3k;
 
   src = fetchurl {
diff --git a/pkgs/development/python-modules/systemd/default.nix b/pkgs/development/python-modules/systemd/default.nix
index 4786e7eb7e18..ec5b3b325dd2 100644
--- a/pkgs/development/python-modules/systemd/default.nix
+++ b/pkgs/development/python-modules/systemd/default.nix
@@ -1,8 +1,9 @@
 { stdenv, buildPythonPackage, fetchFromGitHub, systemd, pkgconfig }:
 
 buildPythonPackage rec {
-  name = "python-systemd-${version}";
+  pname = "systemd";
   version = "234";
+  name = pname + "-" + version;
 
   src = fetchFromGitHub {
     owner = "systemd";
diff --git a/pkgs/development/python-modules/tensorflow/default.nix b/pkgs/development/python-modules/tensorflow/default.nix
index 2ce419fa7fb6..63630c1e1463 100644
--- a/pkgs/development/python-modules/tensorflow/default.nix
+++ b/pkgs/development/python-modules/tensorflow/default.nix
@@ -97,6 +97,8 @@ let
   };
 
 in buildPythonPackage (common // {
+  pname = "tensorflow";
+  version = common.version;
   name = "tensorflow-${common.version}";
 
   deps = stdenv.mkDerivation (common // {
diff --git a/pkgs/development/python-modules/thinc/default.nix b/pkgs/development/python-modules/thinc/default.nix
index 817ea6388f95..15794caf58b9 100644
--- a/pkgs/development/python-modules/thinc/default.nix
+++ b/pkgs/development/python-modules/thinc/default.nix
@@ -30,21 +30,22 @@ let
     version = "1.0.1";
 
     src = fetchPypi {
-      inherit pname version;      
+      inherit pname version;
       sha256 = "17zajiw4mjbkkv6ahp3xf025qglkj0805m9s41c45zryzj6p2h39";
     };
 
     doCheck = false; # fails to import support from test
   };
 in buildPythonPackage rec {
-  name = "thinc-${version}";
+  pname = "thinc";
   version = "6.5.1";
+  name = pname + "-" + version;
 
   src = fetchFromGitHub {
     owner = "explosion";
     repo = "thinc";
     rev = "v${version}";
-    sha256 = "008kmjsvanh6qgnpvsn3qacfcyprxirxbw4yfd8flyg7mxw793ws";    
+    sha256 = "008kmjsvanh6qgnpvsn3qacfcyprxirxbw4yfd8flyg7mxw793ws";
   };
 
   propagatedBuildInputs = [
@@ -67,14 +68,14 @@ in buildPythonPackage rec {
   ];
 
   doCheck = false;
-  
+
   # fails to import some modules
   # checkPhase = ''
   #   ${python.interpreter} -m pytest thinc/tests
   #   # cd thinc/tests
   #   # ${python.interpreter} -m unittest discover -p "*test*"
   # '';
-  
+
   meta = with stdenv.lib; {
     description = "Practical Machine Learning for NLP in Python";
     homepage = https://github.com/explosion/thinc;
diff --git a/pkgs/development/python-modules/u-msgpack-python/default.nix b/pkgs/development/python-modules/u-msgpack-python/default.nix
index aca4e370e461..bab0bc288502 100644
--- a/pkgs/development/python-modules/u-msgpack-python/default.nix
+++ b/pkgs/development/python-modules/u-msgpack-python/default.nix
@@ -5,10 +5,9 @@
 , python
 }:
 
-let
+buildPythonPackage rec {
   pname = "u-msgpack-python";
   version = "2.4.1";
-in buildPythonPackage rec {
   name = "${pname}-${version}";
 
   src = fetchurl {
diff --git a/pkgs/development/python-modules/umemcache/default.nix b/pkgs/development/python-modules/umemcache/default.nix
index 4d09fda83da4..416c857bdc68 100644
--- a/pkgs/development/python-modules/umemcache/default.nix
+++ b/pkgs/development/python-modules/umemcache/default.nix
@@ -1,9 +1,10 @@
 { stdenv, buildPythonPackage, isPy3k, fetchurl }:
 
 buildPythonPackage rec {
-  name = "umemcache-${version}";
+  pname = "umemcache";
   version = "1.6.3";
   disabled = isPy3k;
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "mirror://pypi/u/umemcache/${name}.zip";
diff --git a/pkgs/development/python-modules/uritools/default.nix b/pkgs/development/python-modules/uritools/default.nix
index 99b648b0ee1f..108a7cf5bb0b 100644
--- a/pkgs/development/python-modules/uritools/default.nix
+++ b/pkgs/development/python-modules/uritools/default.nix
@@ -2,8 +2,8 @@
 
 buildPythonPackage rec {
   pname = "uritools";
-  name = "uritools-${version}";
   version = "2.1.0";
+  name = pname + "-" + version;
 
   src = fetchPypi {
     inherit pname version;
diff --git a/pkgs/development/python-modules/usbtmc/default.nix b/pkgs/development/python-modules/usbtmc/default.nix
index 0c6842749073..bcbaa0b728c3 100644
--- a/pkgs/development/python-modules/usbtmc/default.nix
+++ b/pkgs/development/python-modules/usbtmc/default.nix
@@ -1,8 +1,9 @@
 { stdenv, fetchurl, buildPythonPackage, pyusb }:
 
 buildPythonPackage rec {
-  name = "usbtmc-${version}";
+  pname = "usbtmc";
   version = "0.8";
+  name = pname + "-" + version;
 
   src = fetchurl {
     url = "https://github.com/python-ivi/python-usbtmc/archive/v${version}.tar.gz";
diff --git a/pkgs/development/python-modules/waitress-django/default.nix b/pkgs/development/python-modules/waitress-django/default.nix
index 6efaf800b3cd..421995e3792a 100644
--- a/pkgs/development/python-modules/waitress-django/default.nix
+++ b/pkgs/development/python-modules/waitress-django/default.nix
@@ -1,6 +1,10 @@
 { buildPythonPackage, django_1_8, waitress }:
-buildPythonPackage {
-  name = "waitress-django";
+
+buildPythonPackage rec {
+  pname = "waitress-django";
+  version = "0.0.0";
+  name = pname;
+
   src = ./.;
   pythonPath = [ django_1_8 waitress ];
   doCheck = false;
diff --git a/pkgs/development/python-modules/webencodings/default.nix b/pkgs/development/python-modules/webencodings/default.nix
index 834a0ab07fbf..edd0a364ea14 100644
--- a/pkgs/development/python-modules/webencodings/default.nix
+++ b/pkgs/development/python-modules/webencodings/default.nix
@@ -4,10 +4,9 @@
 , pytest
 }:
 
-let
+buildPythonPackage rec {
   pname = "webencodings";
   version = "0.5.1";
-in buildPythonPackage rec {
   name = "${pname}-${version}";
 
   src = fetchurl {
@@ -26,4 +25,4 @@ in buildPythonPackage rec {
     homepage = https://github.com/SimonSapin/python-webencodings;
     license = lib.licenses.bsd3;
   };
-}
\ No newline at end of file
+}
diff --git a/pkgs/development/python-modules/wxPython/3.0.nix b/pkgs/development/python-modules/wxPython/3.0.nix
index 14f6f802ba2a..ab7b44019c54 100644
--- a/pkgs/development/python-modules/wxPython/3.0.nix
+++ b/pkgs/development/python-modules/wxPython/3.0.nix
@@ -19,8 +19,9 @@
 assert wxGTK.unicode;
 
 buildPythonPackage rec {
-  name = "wxPython-${version}";
+  pname = "wxPython";
   version = "3.0.2.0";
+  name = pname + "-" + version;
 
   disabled = isPy3k || isPyPy;
   doCheck = false;
diff --git a/pkgs/top-level/python-packages.nix b/pkgs/top-level/python-packages.nix
index aff5229ddd15..1a04ee6db449 100644
--- a/pkgs/top-level/python-packages.nix
+++ b/pkgs/top-level/python-packages.nix
@@ -10464,22 +10464,7 @@ in {
     fuse = pkgs.fuse;  # use "real" fuse, not the python module
   };
 
-  locustio = buildPythonPackage rec {
-    name = "locustio-0.7.2";
-
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/l/locustio/${name}.tar.gz";
-      sha256 = "c9ca6fdfe6a6fb187a3d54ddf9b1518196348e8f20537f0a14ca81a264ffafa2";
-    };
-
-    propagatedBuildInputs = [ self.msgpack self.requests self.flask self.gevent self.pyzmq ];
-    buildInputs = [ self.mock self.unittest2 ];
-
-    meta = {
-      homepage = http://locust.io/;
-      description = "A load testing tool";
-    };
-  };
+  locustio = callPackage ../development/python-modules/locustio { };
 
   llvmlite = callPackage ../development/python-modules/llvmlite {llvm=pkgs.llvm_4;};
 
@@ -14881,31 +14866,13 @@ in {
 
   psd-tools = callPackage ../development/python-modules/psd-tools { };
 
-  psutil = buildPythonPackage rec {
-    name = "psutil-${version}";
-    version = "4.3.0";
+  psutil = callPackage ../development/python-modules/psutil { };
 
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/p/psutil/${name}.tar.gz";
-      sha256 = "1w4r09fvn6kd80m5mx4ws1wz100brkaq6hzzpwrns8cgjzjpl6c6";
-    };
-
-    # Certain tests fail due to being in a chroot.
-    # See also the older issue: https://code.google.com/p/psutil/issues/detail?id=434
-    doCheck = false;
-
-    buildInputs = with self; [ mock ] ++ optionals stdenv.isDarwin [ pkgs.darwin.IOKit ];
-
-    meta = {
-      description = "Process and system utilization information interface for python";
-      homepage = https://github.com/giampaolo/psutil;
-    };
-  };
-
-  psutil_1 = self.psutil.overrideDerivation (self: rec {
-    name = "psutil-1.2.1";
-    src = pkgs.fetchurl {
-      url = "mirror://pypi/p/psutil/${name}.tar.gz";
+  psutil_1 = self.psutil.overrideAttrs (oldAttrs: rec {
+    name = "${oldAttrs.pname}-${version}";
+    version = "1.2.1";
+    src = oldAttrs.src.override {
+      inherit version;
       sha256 = "0ibclqy6a4qmkjhlk3g8jhpvnk0v9aywknc61xm3hfi5r124m3jh";
     };
   });