encode / Typesystem
Licence: bsd-3-clause
Data validation, serialization, deserialization & form rendering. 🔢
Stars: ✭ 416
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python
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TypeSystem
Documentation: https://www.encode.io/typesystem/
TypeSystem is a comprehensive data validation library that gives you:
- Data validation.
- Object serialization & deserialization.
- Form rendering.
- Marshaling validators to/from JSON schema.
- Tokenizing JSON or YAML to provide positional error messages.
- 100% type annotated codebase.
- 100% test coverage.
- Zero hard dependencies.
Requirements
Python 3.6+
Installation
$ pip3 install typesystem
If you'd like you use the form rendering you'll also want to install jinja2
.
$ pip3 install jinja2
If you'd like you use the YAML tokenization you'll also want to install pyyaml
.
$ pip3 install pyyaml
Quickstart
import typesystem
class Artist(typesystem.Schema):
name = typesystem.String(max_length=100)
class Album(typesystem.Schema):
title = typesystem.String(max_length=100)
release_date = typesystem.Date()
artist = typesystem.Reference(Artist)
album = Album.validate({
"title": "Double Negative",
"release_date": "2018-09-14",
"artist": {"name": "Low"}
})
print(album)
# Album(title='Double Negative', release_date=datetime.date(2018, 9, 14), artist=Artist(name='Low'))
print(album.release_date)
# datetime.date(2018, 9, 14)
print(album['release_date'])
# '2018-09-14'
print(dict(album))
# {'title': 'Double Negative', 'release_date': '2018-09-14', 'artist': {'name': 'Low'}}
Alternatives
There are plenty of other great validation libraries for Python out there, including Marshmallow, Schematics, Voluptuous, Pydantic and many others.
TypeSystem exists because I want a data validation library that offers first-class support for:
- Rendering validation classes into HTML forms.
- Marshaling to/from JSON Schema.
- Obtaining positional errors within JSON or YAML documents.
— ⭐️ —
TypeSystem is BSD licensed code. Designed & built in Brighton, England.
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