Problems with PYTHONPATH

Question

From the command line (Mac OS), when I execute 'echo $PYTHONPATH' I get:

> /opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7

If I then enter the Python interpreter and do the following:

>>> import os
>>> os.environ['PYTHONPATH']
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/UserDict.py", line 23, in __getitem__
    raise KeyError(key)
KeyError: 'PYTHONPATH'

Why would this happen?

Why would your PYTHONPATH be set to a location that Python searches anyway? — Keith
– Keith, Commented Sep 30, 2012 at 22:30
Remember the contents of $PYTHONPATH get appended to sys.path automatically, but they should also appear in os.environ (probably is as the first answer indicates). — Perkins
– Perkins, Commented Sep 30, 2012 at 23:31

Ignacio Vazquez-Abrams · Accepted Answer · 2012-09-30 19:27:13Z

3

You forgot to export it to the environment so that subprocesses can access it; it's currently only a bash variable.

export PYTHONPATH

answered Sep 30, 2012 at 19:27

Ignacio Vazquez-Abrams

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