使用另外两个字典更新嵌套字典

nested_dict = {
    'key1': {
        'subkey1': 'value1',
        'subkey2': 'value2'
    },
    'key2': {
        'subkey3': 'value3',
        'subkey4': 'value4'
    }
}

dict1 = {
    'key1': {
        'subkey1': 'new_value1',
        'subkey2': 'new_value2'
    }
}

dict2 = {
    'key2': {
        'subkey3': 'new_value3',
        'subkey4': 'new_value4'
    },
    'key3': {
        'subkey5': 'value5',
        'subkey6': 'value6'
    }
}

nested_dict.update(dict1)
nested_dict.update(dict2)

print(nested_dict)

{
    'key1': {
        'subkey1': 'new_value1',
        'subkey2': 'new_value2'
    },
    'key2': {
        'subkey3': 'new_value3',
        'subkey4': 'new_value4'
    },
    'key3': {
        'subkey5': 'value5',
        'subkey6': 'value6'
    }
}