Setting `bool` values to `lineno` argument of `warnings.filterwarnings()` and `warnings.simplefilter()` works

[hyperkai]

Bug report

Bug description:

Setting the float value 3.14 to lineno argument of warnings.filterwarnings() and warnings.simplefilter() gets the error message as shown below:

import warnings
                                       # ↓ ↓ ↓ ↓ ↓ ↓
warnings.filterwarnings(action="ignore", lineno=3.14) # Error
warnings.simplefilter(action="ignore", lineno=3.14) # Error
                                     # ↑ ↑ ↑ ↑ ↑ ↑
print(warnings.filters)

AssertionError: lineno must be an int >= 0

But setting the bool values True and False to lineno argument of warnings.filterwarnings() and warnings.simplefilter() works as shown below:

import warnings
                                       # ↓ ↓ ↓ ↓ ↓ ↓
warnings.filterwarnings(action="ignore", lineno=True)
warnings.filterwarnings(action="ignore", lineno=False)
                                        # ↑ ↑ ↑ ↑ ↑ ↑
                                     # ↓ ↓ ↓ ↓ ↓ ↓
warnings.simplefilter(action="ignore", lineno=True)
warnings.simplefilter(action="ignore", lineno=False)
                                      # ↑ ↑ ↑ ↑ ↑ ↑
print(warnings.filters)
# [('ignore', None, <class 'Warning'>, None, False),
#  ('ignore', None, <class 'Warning'>, None, True)]

CPython versions tested on:

3.12

Operating systems tested on:

Windows

[picnixz]

bool is a subclass of int so this is not really an issue per se IMO. They can be considered as 0 or 1. I don't think we should have a dedicated if isinstance(x, bool) just to raise an appropriate error.

I don't think we need to make those functions entirely fool-proof for any kind of int-subclasses. There is a trade-off between practicability and purity IMO.

cc @ncoghlan

[brettcannon]

I'm going to close this as this is just part of the cost of bool being a subclass of int and there's no way we can (or will) sprinkle type checks for bool everywhere int is acceptable. Your best option is to have your linter detect this sort of thing.