commit 5bfc03f430ab13ed84c2c30f2c87e9800b5670a4
author Serhiy Storchaka <storchaka@gmail.com> Tue May 19 11:00:07 2015 +0300
committer Serhiy Storchaka <storchaka@gmail.com> Tue May 19 11:00:07 2015 +0300
tree 65bd9f3891193717f61424862ad75b423281d066
parent 6baa0a53b05d580d21d260c5d7d6ee2d3ff005ee

Issue #23780: Improved error message in os.path.join() with single argument.
Idea by R. David Murray.

Lib/macpath.py

diff --git a/Lib/macpath.py b/Lib/macpath.py
index dbcf368..a90d105 100644
--- a/Lib/macpath.py
+++ b/Lib/macpath.py
@@ -53,6 +53,8 @@
     try:
         colon = _get_colon(s)
         path = s
+        if not p:
+            path[:0] + colon  #23780: Ensure compatible data type even if p is null.
         for t in p:
             if (not path) or isabs(t):
                 path = t