更新一个嵌套defaultdict中的特定值，但不更新其他defaultdicts中的特定值

from collections import defaultdict

# 创建嵌套的defaultdict
nested_dict = lambda: defaultdict(nested_dict)
data = nested_dict()

# 设置一些初始值
data['key1']['subkey1'] = 1
data['key1']['subkey2'] = 2
data['key2']['subkey1'] = 3
data['key2']['subkey2'] = 4

# 更新特定值
data['key1']['subkey1'] = 10

# 输出结果
print(data)

defaultdict(<function <lambda> at 0x000001>, {'key1': defaultdict(<function <lambda> at 0x000002>, {'subkey1': 10, 'subkey2': 2}), 'key2': defaultdict(<function <lambda> at 0x000003>, {'subkey1': 3, 'subkey2': 4})})