Use dot notation to recursively lookup data attributes in a dict

nested_dict.py

"""
NestedDict wrapper
"""
class NestedDict(dict):
    def __getitem__(self, key_namespace):
        if "." not in key_namespace:
            return super(NestedDict, self).__getitem__(key_namespace)
        keys = key_namespace.split('.')
        val = self
        for key in keys:
            if isinstance(val, list):
                val = val[int(key)]
            else:
                val = val[key]
        return val

"""
Example below
"""
data = NestedDict({
    'name': {
        'first': 'John',
        'last': 'Smith'
    },
    'age': 26,
    'favourite_numbers': [3, 7, 11],
})
     
print(data['name'])
print(data['name.first'])
print(data['name.last'])
print(data['age'])
print(data['favourite_numbers'])
print(data['favourite_numbers.2'])
print(data['favourite_numbers.0'])
print(data['favourite_numbers.1'])