如何测量多个函数的system.time

import time

# 定义要测量执行时间的函数
def function1():
    # 执行相应的操作
    time.sleep(1)

def function2():
    # 执行相应的操作
    time.sleep(2)

def function3():
    # 执行相应的操作
    time.sleep(0.5)

# 创建计时器变量
total_time = 0

# 测量函数1的执行时间
start_time = time.time()
function1()
end_time = time.time()
execution_time = end_time - start_time
total_time += execution_time
print("函数1的执行时间：", execution_time, "秒")

# 测量函数2的执行时间
start_time = time.time()
function2()
end_time = time.time()
execution_time = end_time - start_time
total_time += execution_time
print("函数2的执行时间：", execution_time, "秒")

# 测量函数3的执行时间
start_time = time.time()
function3()
end_time = time.time()
execution_time = end_time - start_time
total_time += execution_time
print("函数3的执行时间：", execution_time, "秒")

# 输出总的执行时间
print("总的执行时间：", total_time, "秒")