New submission from Chris Jerdonek <chris.jerdo...@gmail.com>:

The error message for os.path.join() is misleading when the first argument is 
None.  The message should probably say something about mixing "None" and 
strings.

Python 3.3.0b1 (default:f954ee489896, Jul 16 2012, 22:42:29) 
[GCC 4.2.1 Compatible Apple Clang 3.1 (tags/Apple/clang-318.0.58)] on darwin
>>> import os
>>> os.path.join(None, 'a')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File ".../cpython/Lib/posixpath.py", line 89, in join
    "components.") from None
TypeError: Can't mix strings and bytes in path components.

----------
components: Library (Lib)
messages: 165685
nosy: cjerdonek
priority: normal
severity: normal
status: open
title: os.path.join() error misleading with path1=None
versions: Python 3.3

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue15377>
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