akscram / lollipop

Python data serialization/validation library

lollipop

Data serialization and validation library

Features

• flexible schema definition API with powerful type combinators
• data validation
• serialization/deserialization
• in-place deserialization

Example

from lollipop.types import Object, String, Date
from lollipop.validators import Length
from collections import namedtuple
from datetime import date

Person = namedtuple('Person', ['name'])
Book = namedtuple('Book', ['title', 'publish_date', 'author'])

PersonType = Object({
    'name': String(validate=Length(min=1)),
}, constructor=Person)

BookType = Object({
    'title': String(),
    'publish_date': Date(),
    'author': PersonType,
}, constructor=Book)

harryPotter1 = Book(
    title='Harry Potter and the Philosopher\'s Stone',
    publish_date=date(1997, 6, 26),
    author=Person(name='J. K. Rowling')
)

# Dumping
BookType.dump(harryPotter1)
# => {'title': 'Harry Potter and the Philosopher\'s Stone',
#     'publish_date': '1997-06-26',
#     'author': {'name': 'J. K. Rowling'}}

# Loading
BookType.load({'title': 'Harry Potter and the Philosopher\'s Stone',
               'publish_date': '1997-06-26',
               'author': {'name': 'J. K. Rowling'}})
# => Book(title='Harry Potter and the Philosopher\'s Stone',
#         publish_date=date(1997, 06, 26),
#         author=User(name='J. K. Rowling'))

# Partial inplace loading
BookType.load_into(harryPotter1, {'publish_date': '1997-06-27'})
# => Book(title='Harry Potter and the Philosopher\'s Stone',
#         publish_date=date(1997, 06, 27),
#         author=User(name='J. K. Rowling'))

# Loading list of objects
List(BookType).load([
    {'title': 'Harry Potter and the Philosopher\'s Stone',
     'publish_date': '1997-06-26',
     'author': {'name': 'J. K. Rowling'}},
    {'title': 'Harry Potter and the Chamber of Secrets',
     'publish_date': '1998-07-02',
     'author': {'name': 'J. K. Rowling'}},
])
# => [Book(...), Book(...)]

# Validation
BookType.validate({
    'title': 'Harry Potter and the Philosopher\'s Stone',
    'author': {'name': ''},
})
# => {'author': {'name': 'Length should be at least 1'},
#     'publish_date': 'Value is required'}

Installation

$ pip install lollipop

Documentation

Documentation is available at http://lollipop.readthedocs.io/ .

Requirements

• Python >= 2.6 or <= 3.6

Project Links

• Documentation: http://lollipop.readthedocs.io/
• PyPI: https://pypi.python.org/pypi/lollipop
• Issues: https://github.com/maximkulkin/lollipop/issues

License

MIT licensed. See the bundled LICENSE file for more details.