Coping with cyclic imports

Jeffrey Froman jeffrey at fro.man
Tue Apr 8 22:41:06 CEST 2008


Torsten Bronger wrote:

> I know that cyclic imports work in Python under certain
> circumstances.  Can anyone refer me to a page which explains when
> this works?

I don't know of a specific URL offhand.

Cyclic imports are not a problem by themselves, but cyclic definitions are.
Thus:

        # a.py
        import b
        x = 1

        # b.py
        import a
        x = 2

works fine, but:

        # a.py
        import b
        x = 1

        # b.py
        import a
        x = a.x + 1  # circular definition

does not.


Jeffrey 



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