Use single version reference from main module.

docs/conf.py

@@ -13,6 +13,8 @@
 
 import sys, os
 
+from django_filters import __version__
+
 # If extensions (or modules to document with autodoc) are in another directory,
 # add these directories to sys.path here. If the directory is relative to the
 # documentation root, use os.path.abspath to make it absolute, like shown here.
@@ -48,9 +50,9 @@
 # built documents.
 #
 # The short X.Y version.
-version = '2.3'
+version = __version__
 # The full version, including alpha/beta/rc tags.
-release = '2.3.0'
+release = __version__
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.

setup.py

@@ -2,12 +2,12 @@
 import sys
 from setuptools import setup, find_packages
 
+from django_filters import __version__
+
 f = open('README.rst')
 readme = f.read()
 f.close()
 
-version = '2.3.0'
-
 if sys.argv[-1] == 'publish':
     if os.system("pip freeze | grep wheel"):
         print("wheel not installed.\nUse `pip install wheel`.\nExiting.")
@@ -18,13 +18,13 @@
     os.system("python setup.py sdist bdist_wheel")
     os.system("twine upload dist/*")
     print("You probably want to also tag the version now:")
-    print("  git tag -a %s -m 'version %s'" % (version, version))
+    print("  git tag -a %s -m 'version %s'" % (__version__, __version__))
     print("  git push --tags")
     sys.exit()
 
 setup(
     name='django-filter',
-    version=version,
+    version=__version__,
     description=('Django-filter is a reusable Django application for allowing'
                  ' users to filter querysets dynamically.'),
     long_description=readme,