Default Dict

from collections import defaultdict

user = defaultdict(lambda: 'Kevin')

user

defaultdict(<function __main__.<lambda>>, {})

type(user)

collections.defaultdict

user['abc']

'Kevin'

user['country']

'Kevin'

user['name'] = 'Peter'
user['age'] = 21
user['city'] = 'Toronto'

user

defaultdict(<function __main__.<lambda>>,
            {'abc': 'Kevin',
             'age': 21,
             'city': 'Toronto',
             'country': 'Kevin',
             'name': 'Peter'})

for k, v in user.items():
    print(k, "==>", v)

abc ==> Kevin
country ==> Kevin
name ==> Peter
age ==> 21
city ==> Toronto