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devel / comp.lang.python / Re: learning python ...

Re: learning python ...

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From: __pete...@web.de (Peter Otten)
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Subject: Re: learning python ...
Date: Sun, 23 May 2021 19:28:24 +0200
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by: Peter Otten - Sun, 23 May 2021 17:28 UTC

On 23/05/2021 06:37, hw wrote:
>
> Hi,
>
> I'm starting to learn python and have made a little example program
> following a tutorial[1] I'm attaching.
>
> Running it, I'm getting:
>
>
> Traceback (most recent call last):
> File "[...]/hworld.py", line 18, in <module>
> print(isinstance(int, float))
> TypeError: isinstance() arg 2 must be a type or tuple of types
>
>
> I would understand to get an error message in line 5 but not in 18. Is
> this a bug or a feature?

It is a bug in your code (which you don't provide). Did you assign some
value to float, e. g.:

>>> float = 42.0
>>> isinstance(int, float)
Traceback (most recent call last):
File "<pyshell#313>", line 1, in <module>
isinstance(int, float)
TypeError: isinstance() arg 2 must be a type or tuple of types

If you do not shadow the built-in you should get

>>> isinstance(int, float)
False