在嵌套的dict/list python中循环和赋值

nested_dict = {
    'dict1': {
        'key1': 'value1',
        'key2': 'value2',
    },
    'dict2': {
        'key3': 'value3',
        'key4': 'value4',
    },
}

for outer_key, inner_dict in nested_dict.items():
    for inner_key in inner_dict:
        # 循环访问并赋值
        nested_dict[outer_key][inner_key] = 'new_value'

print(nested_dict)

nested_list = [
    [1, 2, 3],
    [4, 5, 6],
    [7, 8, 9],
]

for i in range(len(nested_list)):
    for j in range(len(nested_list[i])):
        # 循环访问并赋值
        nested_list[i][j] = nested_list[i][j] * 2

print(nested_list)