static variables

[Steven D'Aprano]

On Tue, 1 Dec 2015 07:32 am, BartC wrote:

> On 30/11/2015 17:15, Ulli Horlacher wrote:
>> def main():
>>    a(1)
>>    a(2)
>>    a()
>>    print(a.x)
>>    if 'a.x' in globals(): print('global variable')
>>    if 'a.x' in locals():  print('local variable')
> 
> Try this:
> 
>     if 'x' in a.__dict__:  print('attribute of a')


That will work in this specific case, but it isn't guaranteed to always
work. Not all objects have a __dict__, even if they can hold attributes,
and not all attributes are stored in a __dict__.

A better and more general test is:

if hasattr(a, 'x'): print('attribute of a')

 

-- 
Steven