Initializing two dimensional dictionary in Python

Python

◯ usage

>>> table = dict2d(['a', 'b', 'c'])
>>> table['a']['b'] = 100
>>> table['a']['b']
100

◯ definition

def dict2d(key_list, default=None):
    return dict1d(key_list, dict1d(key_list, default))

def dict1d(key_list, default=None):
    n = len(key_list)
    default_list = [default]*n
    return dict(zip(key_list, default_list))

◯ reference