Arg Check

A Python utility for checking that call args have the expected types and all required args are provided.

Works only with Python 3.7 (fixing that soon)

Installation

pip install arg-check

Usage

This library uses simple decorators.

Argument Type Checking

@enforce_arg_types
def foobar(a: int, b: str):
    ...

• Type checking is performed via the annotations. If an argument does not have an annotation, type checking is skipped just for that argument.
• If an argument is a collection, all items in the collection are checked.
• Can handle Union and Optional

Required Arguments

@required_args("a", "b")
def foobar(a, b, c=None):
    ...

• Tests the given arguments and raises a ValueError if the value is either None or an empty string
• To make all arguments required, use @required_args without parenthesis

All checks in one decorator

@strict_args
def foobar(a: int, b: str):
    ...

• All arguments are type checked
• All arguments are required