LEGB rule, totally confused ...

[stef mientki]

hello,

I've thought many times I finally understood the import / namespace rules,
but again I'm totally lost :-(

This is my library file

    # Module lib_test.py

    X = 1

    def Init():
        global X
        X = 3
        print 'Init', X

    def Run ():
        print X                 <=== UnboundLocalError: local variable
    'X' referenced before assignment
        X = X + 1
        print ' Run', X



And this my main program in another file:

    import lib_test
    lib_test.Init()
    print lib_test.X

    lib_test.Run()
    print lib_test.X

Why do I get the error ?
Printing isn't assigning anything or am I missing something.
Now if I remove "X = X + 1" I don't get an error ???
Is this a problem of the traceback procedure or the IDE,
or is Python not completely an interpreter, that reads line by line ???

Please explain this to me.

thanks,
Stef Mientki