读取JSON字符串并查找整数形式的最大值

import json

def find_max_integer(json_str):
    data = json.loads(json_str)

    def traverse(obj):
        max_value = float('-inf')

        if isinstance(obj, int):
            max_value = max(max_value, obj)
        elif isinstance(obj, dict):
            for value in obj.values():
                max_value = max(max_value, traverse(value))
        elif isinstance(obj, list):
            for item in obj:
                max_value = max(max_value, traverse(item))

        return max_value

    max_integer = traverse(data)
    return max_integer

# 示例JSON字符串
json_str = '{"numbers": [1, 2, 3, 4, 5], "nested": {"integers": [10, 20, 30, 40]}}'

# 查找最大值
max_integer = find_max_integer(json_str)
print(max_integer)