Amaury Forgeot d'Arc <amaur...@gmail.com> added the comment:

The patch actually does 2 things:
- it prevents the usage of '=' in putenv, which is is good because the putenv() 
system call handles this badly.
- it will raise an error when unsetting a nonexistent variable. This is a 
change in behaviour which is not needed. (in a shell, the "unset" command will 
silently ignore missing variables)

Also, some unit tests would be appreciated

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nosy: +amaury.forgeotdarc

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<http://bugs.python.org/issue4926>
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