如何将python嵌套字典转换为非嵌套字典？

def flatten_dict(nested_dict, parent_key='', sep='.'):
    flattened_dict = {}
    for key, value in nested_dict.items():
        new_key = parent_key + sep + key if parent_key else key
        if isinstance(value, dict):
            flattened_dict.update(flatten_dict(value, new_key, sep=sep))
        else:
            flattened_dict[new_key] = value
    return flattened_dict

nested_dict = {
    'a': 1,
    'b': {
        'c': 2,
        'd': {
            'e': 3
        }
    }
}

flattened_dict = flatten_dict(nested_dict)
print(flattened_dict)

{
    'a': 1,
    'b.c': 2,
    'b.d.e': 3
}