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Showing content from https://mail.python.org/pipermail/python-dev/2002-June/024889.html below:

[Python-Dev] intra-package mutual imports fail: "from <pkg> import <mod>"

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>          module5.py:
>              from package import module6   # absolute import
>
>          module6.py:
>              from package import module5
>  [...]
>      ImportError: cannot import name module5
>
>  Is this behavior expected?  Or is it a bug?

The problem is that importing with from consists of two steps:
- load the module
- add the imported names to the local namespace

Since this addition is by reference to the actual object and not to 
the symbol's name in the other module, a concept which Python doesn't 
have (use Perl if you want this...), your recursive import doesn't 
work.

The solution would be:
	import package.module6 as module6

which should have the same effect.
-- 
Matthias Urlichs

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