dict.get(key, default) evaluates default even if key exists

[Loris Bennett]

Paul Bryan <pbryan at anode.ca> writes:

> Maybe this will help:
>
>>>> def get(key, default):
> ...   print("entering get")
> ...   print(f"{key=} {default=}")
> ...   print("exiting get")
> ... 
>>>> def generate_default():
> ...   print("entering generate_default")
> ...   print("exiting generate_default")
> ...   return 1
> ... 
>>>> get("a", generate_default())
> entering generate_default
> exiting generate_default
> entering get
> key='a' default=1
> exiting get
>>>> 

OK, so it even has nothing to do with dict.get().  It is just about the
way function arguments are evaluated.  Your example above illustrates
nicely that Python does what I would expect, although from the examples
others have given, I might have to adjust my expectations when using
other languages.

Cheers,

Loris

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