STYLE enable pylint: use-implicit-booleaness-not-comparison

[natmokval]

Issue #48855. This PR enables pylint type "C" warning: use-implicit-booleaness-not-comparison

• All code checks passed.

Note: Pylint at the moment raises the following error on clean main branch

************* Module pandas._libs.tslibs
pandas/_libs/tslibs/__init__.py:38:0: W0406: Module import itself (import-self)

[MarcoGorelli]

Thanks @natmokval for working on this one

Are we sure this one's safe? E.g.

a: list | None

a = None

if a == []:
    print('here')

doesn't print anything, but changing it to

a: list | None

a = None

if not a:
    print('here')

prints 'here'

Perhaps we should keep this one turned off, just like use-implicit-booleaness-not-len?

[natmokval]

Thanks, @MarcoGorelli, you are right. I checked the behavior only in a subset of the cases. It is cleaner to keep this check turned off.

[MarcoGorelli]

cool, thanks - closing for now then, and sorry that you already did work on this!