In code, list.clear doesn't throw error - it's just ignored
Jon Ribbens
jon+usenet at unequivocal.eu
Sun Nov 13 17:20:23 EST 2022
On 2022-11-13, DFS <nospam at dfs.com> wrote:
> In code, list.clear is just ignored.
> At the terminal, list.clear shows
><built-in method clear of list object at 0x000001C9CFEC4240>
>
>
> in code:
> x = [1,2,3]
> x.clear
> print(len(x))
> 3
>
> at terminal:
> x = [1,2,3]
> x.clear
><built-in method clear of list object at 0x000001C9CFEC4240>
> print(len(x))
> 3
>
>
> Caused me an hour of frustration before I noticed list.clear() was what
> I needed.
>
> x = [1,2,3]
> x.clear()
> print(len(x))
> 0
If you want to catch this sort of mistake automatically then you need
a linter such as pylint:
$ cat test.py
"""Create an array and print its length"""
array = [1, 2, 3]
array.clear
print(len(array))
$ pylint -s n test.py
************* Module test
test.py:4:0: W0104: Statement seems to have no effect (pointless-statement)
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