Python3 -递归地将嵌套字典中的所有键替换为句点

def replace_keys(dictionary):
    new_dict = {}
    for key, value in dictionary.items():
        if isinstance(value, dict):
            value = replace_keys(value)
        new_key = key.replace('_', '.')
        new_dict[new_key] = value
    return new_dict

my_dict = {'a_b': 1, 'c_d': {'e_f': 2, 'g_h': {'i_j': 3}}}
new_dict = replace_keys(my_dict)
print(new_dict)

{'a.b': 1, 'c.d': {'e.f': 2, 'g.h': {'i.j': 3}}}