Message402497
There is an unjustified asymmetry between `str` and `list`, as far as lookup goes. Both have an `index()` method that returns the first index of a value, or raises a `ValueError` if it doesn't exist. However, only `str` has the `find` method, which returns -1 if the value is not in the string.
I think it would make sense to add `find` to `list` as well. For starters, it would make the API between the two sequence types more consistent. More importantly (though it depends on the use-case), `find` is usually more convenient than `index`, as one doesn't have to worry about handling an exception. As a bonus, since `list` is mutable, it allows one to write code such as
if (idx := lst.find(value)) == -1:
lst.append(value)
call_some_function(lst[idx])
, making the method even more useful as it is in `str`. |
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2021-09-23 15:05:06 | nemeskeyd | set | recipients:
+ nemeskeyd |
2021-09-23 15:05:06 | nemeskeyd | set | messageid: <1632409506.27.0.197043194996.issue45271@roundup.psfhosted.org> |
2021-09-23 15:05:06 | nemeskeyd | link | issue45271 messages |
2021-09-23 15:05:06 | nemeskeyd | create | |
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