Ternary operator alternative in Ptyhon

Allen brian_vanderburg2 at yahoo.com
Wed Jun 18 08:53:15 CEST 2008


kretik wrote:
> I'm sure this is a popular one, but after Googling for a while I 
> couldn't figure out how to pull this off.
> 
> Let's say I have this initializer on a class:
> 
>     def __init__(self, **params):
> 
> I'd like to short-circuit the assignment of class field values passed in 
> this dictionary to something like this:
> 
>     self.SomeField = \
>     params.has_key("mykey") ? params["mykey"] : None)
> 
> Obviously I know this is not actual Python syntax, but what would be the 
> equivalent? I'm trying to avoid this, basically:
> 
>     if params.has_key("mykey"):
>         self.SomeField = params["mykey"]
>     else:
>         self.SomeField = None
> 
> This is not a big deal of course, but I guess my main goal is to try and 
> figure out of I'm not missing something more esoteric in the language 
> that lets me do this.
> 
> Thanks in advance.

The syntax is a bit different, but:

result = (true_value if condition else false_value)

is how it is in Pytthon:

self.SomeField = (params['mykey'] if params.has_key('mykey') else None)



Brian Vanderburg II



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