using identifiers before they are defined

Ethan Furman ethan at stoneleaf.us
Tue Jun 12 20:51:56 CEST 2012


Julio Sergio wrote:
> Jose H. Martinez <josehmartinezz <at> gmail.com> writes:
> 
>>
>> You should define the function first and then call it.
>>
>>
>>  def something(i):     return i
>>
>>
>> a = something(5)
>>
>>
>> If you want a reference to the function somewhere else you can do this:
>>
> 
> I know that. That was what I meant by "changing the order of the definitions 
> will work" in my original message.
> 
> And I insist in the issue, which is not trivial... In my message I mentioned 
> "crossed recursion", and I delve into it here:
> 
> Suppose I have to define two functions, aa, and, bb that are designed to call 
> each other:
> 
>   def aa():
>      ...
>      ... a call of bb() somewhere in the body of aa
>      ...
> 
>   def bb():
>      ...
>      ... a call of aa() somewhere in the body of bb
>      ...
> 
> 
> Whatever the order of definition of aa and bb the problem remains

No.  The reply from MRAB explains this.

~Ethan~


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