Question on difference between LambdaType and FunctionType

[Iwo Herka]

> That said, though: if you want to distinguish a lambda function from a
> def function, you can do so with reasonable reliability using the
> function's name:

That's what I'm using currently, thank you for the suggestion.
Nonetheless, it feels hacky - that's why I tried to use LambdaType and,
to my surprise, it didn't do the job.

Sincerely,
Iwo Herka
niedz., 25 lis 2018 o 20:41 Chris Angelico <rosuav at gmail.com> napisał(a):
>
> On Mon, Nov 26, 2018 at 6:06 AM Iwo Herka <iwoherka at gmail.com> wrote:
> >
> > Hello,
> >
> > Can someone please provide a use-case for having LambdaType
> > separate to FunctionType?
>
> Clarification: This is talking about the 'types' module.
>
> > Since they are equal
> > (LambdaType == FunctionType) it seems a bit superfluous to me.
> > For example, I cannot do the following:
> >
> >     if type(foo) is FunctionType and not type(foo) is LambdaType:
> >         ...
> >
>
> I was actually unaware of LambdaType even existing. Obviously it has
> to be the same as FunctionType (even more strongly than you put it:
> "types.LambdaType is types.FunctionType"), so I agree, it's
> superfluous. Maybe it's in case some other Python implementation might
> distinguish??
>
> https://docs.python.org/3/library/types.html#types.FunctionType
>
> That said, though: if you want to distinguish a lambda function from a
> def function, you can do so with reasonable reliability using the
> function's name:
>
> >>> def is_lambda(f): return f.__name__ == "<lambda>"
> ...
> >>> is_lambda(is_lambda)
> False
> >>> is_lambda(lambda x: x+1)
> True
>
> ChrisA
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