Merge pull request #84 from SethMMorton/support-older-setuptools

Add support for very old versions of setuptools

1 files changed, 14 insertions, 5 deletions

diff --git a/setup.py b/setup.py
index bef9357..7318d0b 100644
--- a/setup.py
+++ b/setup.py
@@ -1,14 +1,23 @@
 #! /usr/bin/env python
 
+import sys
+
 from setuptools import find_packages, setup
+
+# Very old versions of setuptools do not support the python version
+# specifier syntax, so logic must be defined in code (see issue #64).
+install_requires = []
+extras_require = {"icu": "PyICU >= 1.0.0"}
+if sys.version_info[:2] == (2, 6):
+    install_requires.append("argparse")
+else:
+    extras_require["fast"] = "fastnumbers >= 2.0.0"
+
 setup(
     name='natsort',
     version='5.4.1',
     packages=find_packages(),
-    install_requires=["argparse; python_version < '2.7'"],
+    install_requires=install_requires,
     entry_points={'console_scripts': ['natsort = natsort.__main__:main']},
-    extras_require={
-        'fast': ["fastnumbers >= 2.0.0; python_version > '2.6'"],
-        'icu': ["PyICU >= 1.0.0"]
-    }
+    extras_require=extras_require,
 )