A simple dictionary structure validation

simple_dictionary_validation.py

import trafaret as t
from trafaret import Dict

some_template = {
    'api': {
        'status': 'ok',
        'locale': 'Some str',
        'error': 'None',
        'data': {
            'result': {
                'hotels': {}
            },
            'filters': [],
            'hotel_count': 1,
            'environment': {},
            'request': {},
            'result_count': 2
        },
    }
}

validation = Dict({
    t.Key('api'): Dict({
        t.Key('status'): t.Atom('ok'),
        t.Key('locale'): t.String,
        t.Key('error'): t.Atom('None'),
        t.Key('data'): Dict({
            t.Key('result'): Dict({
                t.Key('hotels'): t.Dict().allow_extra('*')
            }).allow_extra('*')
        }).allow_extra('*')
    }).allow_extra('*')
}).allow_extra('*')

try:
    validation.check(some_template)
except t.DataError as error:
    print('Validation error occurred: {err_msg}'.format(err_msg=error))
else:
    print('Validation was successfully completed')