doc/make.py only works for development build

[pwm1234]

doc/make.py contains the statement os.environ['PYTHONPATH'] = '..', which means it will only work with an inplace build. I need to be able to contribute to pandas documentation using an installed version of pandas. When I comment out this line, I am able to build the html documentation from source.

See this SO question for background and details.

[jorisvandenbossche]

@pwm1234 Does it work if you comment out that one line?

[pwm1234]

Yes, I am able to build the documentation using my installed pandas when I comment out that line.

[datapythonista]

Is this something we want to fix? I can add an option --no-local-pandas (or whatever name makes sense), and don't overwrite the python path, but I don't know if generating the documentation with a different version of pandas makes sense.