How two modules call functions defined in each other?

[Reinhold Birkenfeld]

Tian wrote:
> I am python beginner, I have a question about the interdependence of
> modules.
> 
> For example, when I have two modules:
> 
> module1.py
> -------------
> def plus(x):
>   return add(x,1)
> 
> 
> module2.py
> -------------
> def add(x,y):
>   return x+y
> 
> def plus2(x):
>   return plus(x)+1
> 
> 
> How should I write "import" in both files?
> What about the global varibals? is there anything like "extern" keyword
> in C?
> or python has some other solutions?

Yes. Either define plus and add in module1 or define each one in a
separate module.

Reinhold