python - Switch Django's version -

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i'm using different django framework version(1.3, 1.4, 1.5) different projects.
on laptop, have reinstall django pip, every time want switch project.
there easier(less stupid! :d) way, can automatically switch version need? nvm node?

in opinion easiest way use requirements.txt file virtualenv. requirements.txt file can specify version , every other person uses project can use pip install -r requirements.txt.

this way how big projects (the "pythonic" way).

here have small introduction.


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