Python 3.5+typingterm

typing.SupportsRound

Supports* protocols

A runtime-checkable protocol for objects supporting round() (has __round__).

Syntax

isinstance(obj, typing.SupportsRound)

This is a generic protocol — SupportsRound[T] is parameterized by the type round() returns. Like the other Supports* protocols, isinstance only checks that __round__ exists, not its signature or ndigits support, so a True result doesn't guarantee round(x, 2) won't fail.

Examples

from typing import SupportsRound
from decimal import Decimal
print(isinstance(5, SupportsRound))   # → True
print(isinstance('3.7', SupportsRound))   # → False
print(isinstance(Decimal('2.5'), SupportsRound))   # → True
print(isinstance(1 + 2j, SupportsRound))   # → False
print(issubclass(int, SupportsRound))   # → True

See also

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