testing for valid reference: obj vs. None!=obs vs. obj is not None

[Gabriel Genellina]

At Monday 4/9/2006 17:02, alf wrote:

>I have a reference to certain objects. What is the most pythonic way to
>test for valid reference:

By "valid reference" you mean, you have initially:
obj = None
and you want to detect whether obj is bound to another, different, 
object, right?

>         if obj:

This checks whether obj is considered True, not whether it is None. 
e.g. obj=[] would not pass.

>         if None!=obs:

Would be OK, but the next one is better:

>         if obj is not None:

This is what you are looking for! :)



Gabriel Genellina
Softlab SRL 


	
	
		
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