Adding pycompat.py for py2/py3 work in progress

windows/pycompat.py

@@ -0,0 +1,19 @@
+import sys
+
+is_py3 = (sys.version_info.major >= 3)
+
+if is_py3:
+    def str_from_ascii_function(s):
+        return s.decode("ascii")
+
+    int_types = int
+    basestring = str
+    anybuff = (str, bytes)
+
+else: # py2.7
+    def str_from_ascii_function(s):
+        return s
+
+    int_types = (int, long)
+    basestring = basestring
+    anybuff = basestring