Martin Panter added the comment:
I suspect the $PATH example is a bad example. On my Linux setup, my initial
PATH value is a customized path. After popping it and calling system(), I see a
simpler default path, which is probably re-initialized somewhere else.
I suspect there is no environ.pop() bug. Everthing works according the
documentation if you use another environment variable:
$ TEST_VARIABLE=value python
Python 3.4.0 (default, Mar 17 2014, 23:20:09)
[GCC 4.8.2 20140206 (prerelease)] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import os
>>> os.system('echo "$TEST_VARIABLE"')
value
0
>>> os.environ.pop("TEST_VARIABLE")
'value'
>>> os.system('echo "$TEST_VARIABLE"')
0
The other point in this report, about synchronizing “os.environ” with the C
APIs, is a duplicate of Issue 1159.
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<http://bugs.python.org/issue4887>
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