Fix appveyor and windows. Resolves #293

tests/languages/python_test.py

@@ -0,0 +1,18 @@
+from __future__ import absolute_import
+from __future__ import unicode_literals
+
+import os.path
+
+from pre_commit.languages import python
+
+
+def test_norm_version_expanduser():
+    home = os.path.expanduser('~')
+    if os.name == 'nt':  # pragma: no cover (nt)
+        path = r'~\python343'
+        expected_path = r'{0}\python343'.format(home)
+    else:  # pragma: no cover (non-nt)
+        path = '~/.pyenv/versions/3.4.3/bin/python'
+        expected_path = home + '/.pyenv/versions/3.4.3/bin/python'
+    result = python.norm_version(path)
+    assert result == expected_path