Persistent variables in python

[Gabriel Genellina]

At Tuesday 26/12/2006 19:13, buffi wrote:

>def doStuff():
>   try:
>     #Will throw exception if not set
>     doStuff.timesUsed
>
>Is this concidered bad coding practice since I guess persistent
>variables in functions are not meant to be?

I don't think so, since Python proudly says that functions are 
first-class objects.
CherryPy does a similar thing to mark a method as "exposed".

But perhaps I'd write the code this way to avoid an unneeded and 
risky recursive call:

def doStuff(some, arguments, may, *be, **required):
     try:
         doStuff.timesUsed += 1
     except AttributeError:
         doStuff.timesUsed = 1
         # ... special case for first call ...
     # ...common code...

If you need to code something special for the 2nd and following 
calls, add an else: clause


-- 
Gabriel Genellina
Softlab SRL 


	

	
		
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