If you really need to do this, it should be done like so in some sort of bootstrap file that won't run into parsing/lexing errors:

    import sys
    sys.version_info
    
    if not sys.version_info[:2] == (3, 1):
       raise Exception("You need Python >= 3.1")
    else:
       from your_module import whatever

I really hope no one's seriously using this repo to get any ideas.