Use extras_require instead of conditional code.

Use of extras_require produces correct package metadata for flake8
regardless of the version of Python the package is built with.
The conditional code produces different metadata for Python 3 and 2.
The latest versions of flake8 were released with Python 3 and metadata
did not contain two dependencies necessary for use with Python 2.7.

See https://gitlab.com/pycqa/flake8/issues/341 for details.

Account for users of setuptools<18 that still need the conditional code.

1 files changed, 11 insertions, 4 deletions

diff --git a/setup.py b/setup.py
index 0bb9d2e..7606633 100644
--- a/setup.py
+++ b/setup.py
@@ -23,11 +23,17 @@ requires = [
     "setuptools >= 30",
 ]
 
-if sys.version_info < (3, 4):
-    requires.append("enum34")
+extras_require = {
+    ":python_version<'3.4'": ['enum34'],
+    ":python_version<'3.2'": ['configparser'],
+}
 
-if sys.version_info < (3, 2):
-    requires.append("configparser")
+if int(setuptools.__version__.split('.')[0]) < 18:
+    extras_require = {}
+    if sys.version_info < (3, 4):
+        requires.append('enum34')
+    if sys.version_info < (3, 2):
+        requires.append('configparser')
 
 
 def get_long_description():
@@ -65,6 +71,7 @@ setuptools.setup(
         "flake8.plugins",
     ],
     install_requires=requires,
+    extras_require=extras_require,
     entry_points={
         'distutils.commands': [
             'flake8 = flake8.main.setuptools_command:Flake8'