当某些key不是字符串时，如何将Python dict转换为JSON？

import json

def convert_to_json(obj):
    if isinstance(obj, dict):
        # 将非字符串的key转换为字符串
        obj = {str(key): value for key, value in obj.items()}
    return json.dumps(obj)

# 示例字典
data = {1: 'value1', 2: 'value2', 3: 'value3'}

# 转换为JSON
json_data = convert_to_json(data)
print(json_data)

{"1": "value1", "2": "value2", "3": "value3"}