JSON如何删除&#x27；字符串的字母

import json
import re

def remove_letters(json_data):
    if isinstance(json_data, dict):
        for key, value in json_data.items():
            if isinstance(value, str):
                json_data[key] = re.sub('[a-zA-Z]', '', value)
            else:
                remove_letters(value)
    elif isinstance(json_data, list):
        for i in range(len(json_data)):
            if isinstance(json_data[i], str):
                json_data[i] = re.sub('[a-zA-Z]', '', json_data[i])
            else:
                remove_letters(json_data[i])

# 示例JSON字符串
json_str = '{"name": "John", "age": 30, "address": "123 Main St"}'

# 解析JSON字符串为对象
json_data = json.loads(json_str)

# 删除字母
remove_letters(json_data)

# 更新JSON数据
updated_json_str = json.dumps(json_data)

print(updated_json_str)