Comparison between Marshmallow and Colander

marshmallow_colander_bench.py

import timeit
import uuid
import colander
import marshmallow


class BarList(colander.SequenceSchema):
    item = colander.SchemaNode(
        colander.Integer(), validator=colander.Range(min=1))


class SignupSchema(colander.MappingSchema):
    @staticmethod
    def schema_type():
        return colander.Mapping(unknown='preserve')

    username = colander.SchemaNode(colander.String())
    foo = colander.SchemaNode(
        colander.Integer(), validator=colander.Range(min=1))
    bar = BarList()


@colander.deferred
def def_uuid(node, kw):
    return str(uuid.uuid4())


@colander.deferred
def def_validator(node, kw):
    return colander.Function(lambda v: kw['bound'] == v)


class SignupSchemaWithDeferred(SignupSchema):
    uuid = colander.SchemaNode(colander.String(), missing=def_uuid)
    bound = colander.SchemaNode(colander.String(), validator=def_validator)


class SignupSchemaM(marshmallow.Schema):
    class Meta:
        strict = True
        ordered = True
        preserve = True

    username = marshmallow.fields.String(required=True)
    foo = marshmallow.fields.Integer(
        required=True,
        validate=[marshmallow.validate.Range(min=1)])

    bar = marshmallow.fields.List(marshmallow.fields.Integer(
        validate=[marshmallow.validate.Range(min=1)]), many=True)

    @marshmallow.post_load(pass_original=True)
    def _add_unknown(self, data, original):
        """Preserve unknown keys during deserialization."""
        for key, val in original.items():
            if key not in self.fields:
                data[key] = val
        return data


class SignupSchemaContextM(SignupSchemaM):
    uuid = marshmallow.fields.String(missing=lambda: str(uuid.uuid4()))
    bound = marshmallow.fields.String()

    @marshmallow.validates('bound')
    def validate_bound(self, value):
        if self.context['bound'] != value:
            raise marshmallow.ValidationError('WRONG!')


data = {'foo': 1, 'bar': [1, 2, 3],
        'bound': 'YYYY',
        'baz': {'a': 'test',
                'b': ['a', 'b', 'c']},
        'username': 'ergo'}


def test_colander():
    schema = SignupSchema()
    return schema.deserialize(data)


to_bind_schema = SignupSchemaWithDeferred()
def test_colander_bind():
    schema = to_bind_schema.bind(bound='YYYY')
    return schema.deserialize(data)


def test_marshmallow():
    schema = SignupSchemaM()
    return schema.load(data).data


def test_marshmallow_context():
    schema = SignupSchemaContextM()
    schema.context.setdefault('bound', 'YYYY')
    return schema.load(data).data


print(test_colander_bind())
print(test_marshmallow_context())
c_result = timeit.timeit(test_colander, number=10000)
m_result = timeit.timeit(test_marshmallow, number=10000)
print(f'Colander took {c_result:.4f}')
print(f'Marshmallow took {m_result:.4f}')
print('-----------------------')
print(f'Marshmallow took {m_result/c_result:.2f}x of Colander execution time')
print('\nNow testing with binds/context\n')

c_result = timeit.timeit(test_colander_bind, number=10000)
m_result = timeit.timeit(test_marshmallow_context, number=10000)
print(f'Colander w/bind took {c_result:.4f}')
print(f'Marshmallow w/context took {m_result:.4f}')
print('-----------------------')
print(f'Marshmallow w/context took {m_result/c_result:.2f}x of Colander w/bind execution time')

@ergo I updated the script to separate instantiation from the benchmark functions: https://gist.github.com/sloria/b84cd0118337bb3b6d001d959d95a922 .

I also posted the results for both marshmallow 2 and marshmallow 3 on my fork.