Limier

Limier is a smart toolkit for conversion and validation of function arguments in Python powered by type annotations.

A typical use case is the conversion of route parameters in the context of web routing.

Install

pip install limier

Basic usage

from limier import converted, chain

# Custom converter: validate that the input value is positive
def positive(value: int) -> int:
    if value < 0:
        raise ValueError("Expected positive value")
    return value

@converted
def compute(x: int, times: chain(int, positive)) -> float:
    return x * times

result = compute("2", times="2.5")
assert result == 5

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