[issue9309] Add environment variable complementing command line option -no-user-cfg

[Michael Brickenstein]

Michael Brickenstein <brickenstein at mfo.de> added the comment:

Actually, Sage acts in a similar way like virtualenvs do.
In fact, config files are also a problem for virtualenv, see second red box here:

http://wiki.pylonshq.com/display/pylonscookbook/Using+a+Virtualenv+Sandbox

cite:
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Virtualenv is currently incompatible with distutils.cfg and ~/.pydistutils.cfg. If you have either of these files, virtualenv will put easy_install into the bin directory specified in the config file, rather than into the virtualenv where it belongs.

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nosy: +Michael.Brickenstein

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<http://bugs.python.org/issue9309>
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