Andrew Dalke added the comment:
Ahh, so the bug here that the environ dict should use neither UserDict nor
dict, it should implement the core {get,set,del}item and keys and use
DictMixin.
Martin mentioned that the patch doesn't support setdefault. He didn't note
though that the current code also doesn't support the dictionary interface
consistently. This shows a problem with popitem.
>>> import os
>>> os.environ["USER"]
'dalke'
>>> os.environ["USER"] = "nobody"
>>> os.system("echo $USER")
nobody
0
>>> del os.environ["USER"]
>>> os.system("echo $USER")
0
>>> os.environ["USER"] = "dalke"
>>> while os.environ: print os.environ.popitem()
...
('GROUP', 'staff')
('XDG_DATA_HOME', '/Users/dalke/.local/share')
('TERM_PROGRAM_VERSION', '133')
('CVS_RSH', 'ssh')
('LOGNAME', 'dalke')
('USER', 'dalke')
... removed for conciseness ...
('QTDIR', '/usr/local/qt')
>>> os.system("echo $USER")
dalke
0
>>>
Not enough people know about DictMixin.
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Tracker <[EMAIL PROTECTED]>
<http://bugs.python.org/issue1367711>
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