Force python to use an older version of module (than what I have installed now)

by

A better version of option B. would be to replace 

import twisted

by

import pkg_resources
pkg_resources.require("Twisted==8.2.0")
import twisted

which will arrange for the correct version of twisted to be imported, so long as it’s installed, and raises an exception otherwise. This is a more portable solution.

This won’t work, though (nor would any other variaton of option B), if twisted gets imported before the pkg_resources.require gets called; twisted will already be in sys.modules

OP Edit: Minor syntax correction, per pkg_resources docs

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