python：运行时带有pkg_resources的多个库版本（pkg_resources.VersionConflict错误）

Question

I'm trying to use two different releases of a same library (installed with easy_install --multi-version) from within the same python script. The general idea is illustrated in the code below.

If I call each version independently, everything is fine. If I want to call one version and then the other, I get a VersionConflict error.

There must be a way to "unload" the previous distribution from the working set before loading the other one but I seem to always get lost reading the pkg_resources manual .

Can anyone point me to the right way to go about this? Thanks a lot.

#!/usr/local/bin/python2.7
# -*- coding: utf-8 -*-
def test1():
    import pkg_resources
    pkg_resources.require('obspy.core==0.6.2')
    import obspy.core
    try:
        print obspy.core.__version__
    except:
       print "Can not read obspy.core version"
def test2():
    import pkg_resources
    pkg_resources.require('obspy.core==0.4.8')
    import obspy.core
    try:
        print obspy.core.__version__
    except:
        print "Can not read obspy.core version"
if __name__ == '__main__':
    test1()
    test2()

Answer 1

Have you tried to use reload(module) in the cases where the module is already imported?

Reload