示例代码：

import json
import time

s = '[{"name": "dgw", "age": 26, "sex": "男"}, {"name": "dgw2", "age": 27, "sex": "男"}, ' \
    '{"name": "dgw3", "age": 28, "sex": "男"}]'

eval_start = time.time()
for _ in range(100000):
    res = eval(s)
print(type(res), type(res[0]), res)
print(f"使用eval()用时：{time.time() - eval_start} s")

json_start = time.time()
for _ in range(100000):
    res = json.loads(s)
print(type(res), type(res[0]), res)
print(f"使用json.loads用时：{time.time() - json_start} s")

运行结果：

总结：从运行结果来看，json.loads()的运行效率要远远高于eval()方法 。