we'll assume '_' means '-' for versions from wheel filenames

Author: qwcode

pip/wheel.py

@@ -246,7 +246,9 @@ def __init__(self, filename):
         wheel_info = self.wheel_file_re.match(filename)
         self.filename = filename
         self.name = wheel_info.group('name').replace('_', '-')
-        self.version = wheel_info.group('ver')
+        # we'll assume "_" means "-" due to wheel naming scheme
+        # (https://github.com/pypa/pip/issues/1150)
+        self.version = wheel_info.group('ver').replace('_', '-')
         self.pyversions = wheel_info.group('pyver').split('.')
         self.abis = wheel_info.group('abi').split('.')
         self.plats = wheel_info.group('plat').split('.')

tests/unit/test_wheel.py

@@ -163,6 +163,14 @@ def test_purelib_platlib(self):
         for name, path, expected in packages:
             assert wheel.root_is_purelib(name, path) == expected
 
+    def test_version_underscore_conversion(self):
+        """
+        Test that we convert '_' to '-' for versions parsed out of wheel filenames
+        """
+        w = wheel.Wheel('simple-0.1_1-py2-none-any.whl')
+        assert w.version == '0.1-1'
+
+
 class TestPEP425Tags(object):
 
     def test_broken_sysconfig(self):