Moved imports to the top, made them compatible with Python 2, and added a docstring.

setuptools/compat.py

@@ -27,7 +27,7 @@ if sys.version_info[0] < 3:
     unichr = unichr
     unicode = unicode
     bytes = str
-    from urllib import url2pathname, splittag
+    from urllib import url2pathname, splittag, pathname2url
     import urllib2
     from urllib2 import urlopen, HTTPError, URLError, unquote, splituser
     from urlparse import urlparse, urlunparse, urljoin, urlsplit, urlunsplit
@@ -73,7 +73,7 @@ else:
     bytes = bytes
     from urllib.error import HTTPError, URLError
     import urllib.request as urllib2
-    from urllib.request import urlopen, url2pathname
+    from urllib.request import urlopen, url2pathname, pathname2url
     from urllib.parse import (
         urlparse, urlunparse, unquote, splituser, urljoin, urlsplit,
         urlunsplit, splittag,

setuptools/tests/test_packageindex.py

 """Package Index Tests
 """
 import sys
+import os
 import unittest
 import pkg_resources
-from setuptools.compat import urllib2, httplib, HTTPError, unicode
+from setuptools.compat import urllib2, httplib, HTTPError, unicode, pathname2url
 import distutils.errors
 import setuptools.package_index
 from setuptools.tests.server import IndexServer
@@ -152,13 +153,14 @@ class TestPackageIndex(unittest.TestCase):
         self.assertEqual(rev, '2995')
 
     def test_local_index(self):
+        """
+        local_open should be able to read an index from the file system.
+        """
         f = open('index.html', 'w')
         f.write('<div>content</div>')
         f.close()
         try:
-            import urllib.request
-            import os
-            url = 'file:' + urllib.request.pathname2url(os.getcwd()) + '/'
+            url = 'file:' + pathname2url(os.getcwd()) + '/'
             res = setuptools.package_index.local_open(url)
         finally:
             os.remove('index.html')