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From: Jason Friedman <jsf80238@gmail.com>
Newsgroups: comp.lang.python
Subject: Re: Two python issues
Date: Tue, 5 Nov 2024 14:08:45 -0700
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Bytes: 5396

>
> (a) An error-prone "feature" is returning -1 if a substring is not found
> by "find", since -1 currently refers to the last item. An example:
>
>  >>> s = 'qwertyuiop'
>  >>> s[s.find('r')]
> 'r'
>  >>> s[s.find('p')]
> 'p'
>  >>> s[s.find('a')]
> 'p'
>  >>>
>
> If "find" is unsuccessful, an error message is the only clean option.
> Moreover, using index -1 for the last item is a bad choice: it should be
> len(s) - 1 (no laziness!).
>

I'm not sure if this answers your objection but the note in the
documentation (https://docs.python.org/3/library/stdtypes.html#str.find)
says:

The find() method should be used only if you need to know the position of
sub.

I think the use case above is a little bit different.