通过变量修改嵌套字典

# 定义一个嵌套字典
nested_dict = {
    'key1': {
        'subkey1': 'value1',
        'subkey2': 'value2'
    },
    'key2': {
        'subkey3': 'value3',
        'subkey4': 'value4'
    }
}

# 修改嵌套字典中的值
nested_dict['key1']['subkey1'] = 'new_value1'
nested_dict['key2']['subkey4'] = 'new_value4'

# 打印修改后的嵌套字典
print(nested_dict)

{
    'key1': {
        'subkey1': 'new_value1',
        'subkey2': 'value2'
    },
    'key2': {
        'subkey3': 'value3',
        'subkey4': 'new_value4'
    }
}