https://github.com/json2d/validium

a functional library for creating validators in Python
https://github.com/json2d/validium

functional-programming validation

Last synced: 26 days ago
JSON representation

a functional library for creating validators in Python

• Host: GitHub
• URL: https://github.com/json2d/validium
• Owner: json2d
• License: mit
• Created: 2020-02-28T23:05:59.000Z (almost 5 years ago)
• Default Branch: master
• Last Pushed: 2020-03-21T00:02:05.000Z (almost 5 years ago)
• Last Synced: 2024-09-22T11:06:19.885Z (4 months ago)
• Topics: functional-programming, validation
• Language: Python
• Homepage:
• Size: 20.5 KB
• Stars: 0
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

Awesome Lists containing this project

README

        
# validium

a Python utility library for performing validations flexibly

## Installation

```bash

pip install validium

```

## Quick Start

Here's an example of how to create and use some very simple validators for some numbers:

```py

import validium as V

PI = 3.14

ONE = 1

is_number = V.Validator(lambda x: isinstance(x, Number), 'must be a number')

is_number.validate(PI) # pass

is_number.validate(ONE) # pass

is_positive = V.Validator(lambda x: x > 0, 'must be positive')

is_positive.validate(PI) # pass

is_positive.validate(ONE) # pass

is_not_one = V.Validator(lambda x: not x == 1, 'must not equal 1')

is_not_one.validate(PI) # pass

is_not_one.validate(ONE) # AssertionError: must not equal 1

```

### Building Up

Here's an example of how to parameterize and reuse a common validator pattern:

```py

is_not = lambda y: V.Validator(lambda x: not x == y, 'must not equal {}'.format(x)) # u

is_not(-1).validate(ONE) # pass

is_not(0).validate(ONE) # pass

is_not(1).validate(ONE) # AssertionError: must not equal 1

```

This approach will help keep your code nice and DRY in the event you need handful of validators that behave mostly the same but slightly different.