Python计算代码运行时间的四种方法

#python 的标准库手册推荐在任何情况下尽量使用time.clock().
#只计算了程序运行CPU的时间，返回值是浮点数
import time
start =time.clock()
#中间写上代码块
end = time.clock()
print('Running time: %s Seconds'%(end-start))

#该方法包含了其他程序使用CPU的时间，返回值是浮点数
import time
start=time.time()
#中间写上代码块
end=time.time()
print('Running time: %s Seconds'%(end-start))

#该方法包含了其他程序使用CPU的时间
import datetime
start=datetime.datetime.now()
#中间写代码块
end=datetime.datetime.now()
print('Running time: %s Seconds'%(end-start))

#在 Unix 系统中，建议使用 time.time()，在 Windows 系统中，建议使用 time.clock()
#实现跨平台的精度性可以使用timeit.default_timer()
import timeit
start=timeit.default_timer()
#中间写代码块
end=timeit.default_timer()
print('Running time: %s Seconds'%(end-start))

import time

start_time = time.time()  # 获取当前时间

# 在这里放置你想要测试的代码
for i in range(0, 1000000):
    pass

end_time = time.time()  # 代码运行后再次获取当前时间

execution_time = end_time - start_time  # 计算运行时间

print(f"代码运行时间: {execution_time}秒")

import timeit

start_time = timeit.default_timer()

# 在这里放置你想要测试的代码
for i in range(0, 1000000):
    pass

end_time = timeit.default_timer()

print(f"代码运行时间: {end_time - start_time}秒")

import timeit

# 定义你的函数
def function1():
    # 函数1的代码
    pass

def function2():
    # 函数2的代码
    pass

def function3():
    # 函数3的代码
    pass

# 使用timeit来测量每个函数的执行时间
print("Measuring execution time for function1:")
start_time = timeit.default_timer()
for _ in range(10000):
    function1()
end_time = timeit.default_timer()
print(f"Time taken by function1: {end_time - start_time} seconds")

print("Measuring execution time for function2:")
start_time = timeit.default_timer()
for _ in range(10000):
    function2()
end_time = timeit.default_timer()
print(f"Time taken by function2: {end_time - start_time} seconds")

print("Measuring execution time for function3:")
start_time = timeit.default_timer()
for _ in range(10000):
    function3()
end_time = timeit.default_timer()
print(f"Time taken by function3: {end_time - start_time} seconds")

import timeit

# 定义你的函数
def function1():
    # 函数1的代码
    pass

def function2():
    # 函数2的代码
    pass

def function3():
    # 函数3的代码
    pass

# 设置timeit参数
setup_code = """
from __main__ import function1, function2, function3
"""
stmt1 = "function1()"
stmt2 = "function2()"
stmt3 = "function3()"
number_of_runs = 10000
repeats = 3  # 重复测量次数以获得更稳定的结果

# 使用timeit.repeat来测量每个函数的执行时间
print("Measuring execution time for function1:")
times1 = timeit.repeat(stmt=stmt1, setup=setup_code, repeat=repeats, number=number_of_runs)
print(f"Average time taken by function1: {min(times1)} seconds")

print("Measuring execution time for function2:")
times2 = timeit.repeat(stmt=stmt2, setup=setup_code, repeat=repeats, number=number_of_runs)
print(f"Average time taken by function2: {min(times2)} seconds")

print("Measuring execution time for function3:")
times3 = timeit.repeat(stmt=stmt3, setup=setup_code, repeat=repeats, number=number_of_runs)
print(f"Average time taken by function3: {min(times3)} seconds")

setup_code = """
from __main__ import function1, function2, function3
"""