python-progressbar/progressbar/base.py at develop · commit-0/python-progressbar · GitHub

36 lines (24 loc) · 572 Bytes

from __future__ import annotations

import typing

from typing import IO, TextIO

class FalseMeta(type):

@classmethod

def __bool__(cls) -> bool: # pragma: no cover

return False

@classmethod

def __cmp__(cls, other: typing.Any) -> int: # pragma: no cover

return -1

__nonzero__ = __bool__

class UnknownLength(metaclass=FalseMeta):

pass

class Undefined(metaclass=FalseMeta):

pass

assert IO is not None

assert TextIO is not None

__all__ = (

'FalseMeta',

'UnknownLength',

'Undefined',

'IO',

'TextIO',

)

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