pyow 0.0.1

A function argument validation for humans

Function argument validation for humans for Python 3!

Highlights

• Straight port from the amazing library ow from Sindre Sorhus
• Expressive chainable API
• Lots of built-in validations
• Supports custom validations
• Written in Python3 with Type hinting

Notes

Since this is a straight up port from the JavaScript library not all features are available. Partly since this is a port and I haven't caught up and also since Python doesn't support all usecases as JavaScript does.

Install

$ pip3 install pyow

Usage

from pyow import pyow;

def unicorn(input):
	pyow(input, pyow.string.min_length(5));

	# …

unicorn(3)
>>> ArgumentError: ('Expected argument to be of type `str` but received type `int`')

unicorn('yo');
>>> ArgumentError: ('Expected string to have a minimum length of `3`, got `yo`'

API

ow(value, predicate)

Test if value matches the provided predicate. Throws an ArgumentError if the test fails.

ow.{type}

All the below types return a predicate. Every predicate has some extra operators that you can use to test the value even more fine-grained.

Primitives

• string
• number
• boolean

Built-in types

• list
• error
• dict
• set

Maintainers

• Henrik Andersson

Related

• @sindresorhus/ow - Function argument validation for humans

License

MIT