Incorrect extension of PYTHONPATH

[divmod-migration]

If the PYTHONPATH environment variable is already empty, doing something like:

PYTHONPATH="/path/to/dir:$PYTHONPATH" python [...]

results in a PYTHONPATH of "/path/to/dir:". As the empty segment at the end is interpreted as . (the current directory), this is undesireable. The easiest way to avoid this is to do:

PYTHONPATH="/path/to/dir${PYTHONPATH:+:$PYTHONPATH}" python [...]

This defect is present in axiom.test.test_xatop in Axiom, as well as in epsilon.release in Epsilon.

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Imported from Launchpad using lp2gh.

• date created: 2011-09-13T01:36:29Z
• owner: mithrandi
• the launchpad url was https://bugs.launchpad.net/bugs/848493