Python scope / namespace issue

Question

I have two python modules:

////funcs.py

from classes import * def func(): d = D() print "func" if __name__ == "__main__": c = C() 

////classes.py

 from funcs import * class C: def __init__(self): print "C class" func() class D: def __init__(self): print "D class" 

---

Running funcs.py gives a NameError saying that the "global name" D "is not defined." However, if I comment on creating an instance of D (), everything will be fine.

Why is this happening?

thanks

Answer 1

This works just fine without complicating your code:

///funcs.py

 import classes def func(): d = classes.D() print "func" if __name__ == "__main__": c = classes.C() 

///classes.py

 import funcs class C: def __init__(self): print "C class" funcs.func() class D: def __init__(self): print "D class" 

Sometimes it is much easier to use simple imports than from ... import ... There is a good article: http://effbot.org/zone/import-confusion.htm

Answer 2

The problem arises from trying to use a cyclically imported module during module initialization. To clarify, the use of "out of use of the module" requires that the module be compiled. Instead, if you switch to using the "import module" in both cases, it should work fine.