yamb

YAml Meta Binding microframework

Define schema for YAML documents a-la SQLAlchemy to read, write and manipulate data like a python object.

Basic example

from yamb import Literal, Nested, Collection, YAMBObject


class Address(YAMBObject):
    city = Literal(default='New York')
    street = Literal()

class Person(YAMBObject):
    name = Literal()
    phone = Literal()
    address = Nested(Address)

    def lives_close_to(self, another_person):
        return self.address.city == another_person.address.city

class Phonebook(YAMBObject):
    title = Literal()
    people = Collection(Person)


friends = Phonebook(title='Friends', people=[])

friends.people.append(Person(name='Sue', phone='+12345', address=Address(street='Some blvd')))
sam = Person(name='Sam', phone='+123456', address=Address(city='London', street='Picadilly'))
friends.people += [sam]

with open('friends.yml', 'w') as f:
    f.write(friends._dump())

parsed = Phonebook._load(open('friends.yml'))

assert parsed.title == 'Friends'
assert parsed.people[0].address.city == 'New York'
assert parsed.people[1].name == 'Sam'