Replacement _pycompatstub designed to be compatible with our demandimporter.
try-except is replaced by version comparison because ImportError will no longer
be raised immediately.
This should be less invasive than mucking builtins.
Since tokenize.untokenize() looks start/end positions of tokens, we calculates
them from the NEWLINE token of the future import.
These functions will be imported automagically by our code transformer.
getattr() and setattr() are widely used in our code. We wouldn't probably
want to rewrite every single call of getattr/setattr. delattr() and hasattr()
aren't that important, but they are functions of the same kind.
We have a single line function which just lowercase the letters and replaces
"_" with "". Its better to avoid that function call. Moreover we calling this
function around 33 times.
pycompat.py includes hack to import modules whose names are changed in Python 3.
We use try-except to load module according to the version of python. But this
method forces us to import the modules to raise an ImportError and hence making
it demandimport unfriendly.
This patch changes the try-except blocks to a single if-else block. To avoid
test-check-pyflakes.t complain about unused imports, pycompat.py is excluded
from the test.
The BaseHTTPServer, SimpleHTTPServer and CGIHTTPServer has been merged into
http.server in python 3. All of them has been merged as util.httpserver to use
in both python 2 and 3. This patch adds a regex to check-code to warn against
the use of BaseHTTPServer. Moreover this patch also includes updates to lower
part of test-check-py3-compat.t which used to remain unchanged.
The httplib library is renamed to http.client in python 3. So the
import is conditionalized and a test is added in check-code to warn
to use util.httplib
The cPickle is renamed to _pickle in python3 and this C extension is available
in pickle which was not included in earlier versions. So imports are conditionalized
to import cPickle in py2 and pickle in py3. Moreover the use of pickle in py2 is
switched to cPickle as the C extension is faster. The hack is added in util.py and
the modules import util.pickle
python3 url.request and url.error are mapped as util.urlreq/util.urlerr
python2 equivalents from urllib/urllib2 are mapped according to the py3
hierarchy
While the pycompat module will actually handle divergence, please
access these properties from the util module:
util.queue = Queue.Queue / queue.Queue
util.empty = Queue.Empty / queue.Empty
