I'm working on a python class that is being shared between two products. 90% of the functionality applies to both products. For the 10% that's different the code is littered with this kind of thing:

#Start of file
project = 'B'

#Some line of code

if project == 'A':
    import moduleA
elif project == 'B':
    import moduleB

#Many lines of code

if project == 'A':
    print moduleA.doA(2)
elif project == 'B':
    print moduleB.doB(2)

This doesn't seem very elegant or very readable, has anyone encountered this sort of thing before? Are there better ways of doing it?