forgot file

myrelpath.py

@@ -0,0 +1,19 @@
+"""relpath is not present in python 2.5 and below, so hold an implementation of it.
+"""
+try:
+    from os.path import relpath
+except ImportError:
+    from posixpath import curdir, sep, pardir, join, abspath, commonprefix
+
+    def relpath(path, start=curdir):
+        """Return a relative version of a path"""
+        if not path:
+            raise ValueError("no path specified")
+        start_list = abspath(start).split(sep)
+        path_list = abspath(path).split(sep)
+        # Work out how much of the filepath is shared by start and path.
+        i = len(commonprefix([start_list, path_list]))
+        rel_list = [pardir] * (len(start_list)-i) + path_list[i:]
+        if not rel_list:
+            return curdir
+        return join(*rel_list)