diff --git a/migra/changes.py b/migra/changes.py
index fb594ed..0e8674d 100644
--- a/migra/changes.py
+++ b/migra/changes.py
@@ -122,7 +122,7 @@ def statements_from_differences(
             for k, v in added.items():
                 if not has_uncreated_dependencies(v, pending_creations):
                     if k in pending_creations:
-                        if hasattr(v, 'safer_create_statements'):
+                        if hasattr(v, "safer_create_statements"):
                             statements += v.safer_create_statements
                         else:
                             statements.append(v.create_statement)
@@ -137,7 +137,7 @@ def statements_from_differences(
                 if creations:
                     if not has_uncreated_dependencies(v, pending_creations):
                         if k in pending_creations:
-                            if hasattr(v, 'safer_create_statements'):
+                            if hasattr(v, "safer_create_statements"):
                                 statements += v.safer_create_statements
                             else:
                                 statements.append(v.create_statement)
diff --git a/migra/command.py b/migra/command.py
index 4310ac7..602bd44 100644
--- a/migra/command.py
+++ b/migra/command.py
@@ -4,8 +4,6 @@ import argparse
 import sys
 from contextlib import contextmanager
 
-
-
 from .migra import Migration
 from .statements import UnsafeMigrationException
 
@@ -17,6 +15,7 @@ def arg_context(x):
 
     else:
         from sqlbag import S
+
         with S(x) as s:
             yield s
 
diff --git a/migra/migra.py b/migra/migra.py
index 69c8d8e..6034687 100644
--- a/migra/migra.py
+++ b/migra/migra.py
@@ -2,7 +2,6 @@ from __future__ import unicode_literals
 
 from schemainspect import DBInspector, get_inspector
 
-
 from .changes import Changes
 from .statements import Statements
 
@@ -60,6 +59,7 @@ class Migration(object):
 
     def apply(self):
         from sqlbag import raw_execute
+
         for stmt in self.statements:
             raw_execute(self.s_from, stmt)
         self.changes.i_from = get_inspector(