Python计算程序运行时间

import time

# 程序开始时的时间
time_start=time.time()

# 程序结束时系统时间
time_end=time.time()

# 两者相减
print('totally cost',time_end-time_start)

import time
limit = 10*100*1000
start = time.perf_counter()
 
while True:
    limit -= 1
    if limit <= 0:
        break
delta = time.perf_counter() - start
print("程序运行的时间是：{}秒".format(delta))