Python中计时程序运行时间的几种常用方法

import time

def do_something(nsec=0):
	if isinstance(nsec, (int, float)):
		time.sleep(nsec)  # 模拟程序运行耗时

if __name__ == "__main__":
	start_time	= time.perf_counter()  # 记录开始时间戳
	do_something(3)
	do_something(1)
	do_something(0.5)
	end_time = time.perf_counter()  # 记录结束时间戳
	print(f"耗时 {end_time - start_time:.3f} s")

import time 

class Timer:
	"""
	按照 xxh xxm xxs格式计时程序运行时间的计时上下文管理器
	"""
	def __init__(self, code_part):
		self._part = code_part
		
	def __enter__(self):
		self._enter_time = time.perf_counter()
		
	def __exit__(self, *exc_args):  # 不做异常处理，因此将异常相关的参数打包
		time_span = time.perf_counter() - self._enter_time
		hours, seconds = divmod(time_span, 3600)
		minutes, seconds = divmod(seconds, 60) 
		print(f"{self._part}耗时 {int(hours)}h {int(minutes)}m {seconds:.2f}s")

def do_something(nsec=0):
	if isinstance(nsec, (int, float)):
		time.sleep(nsec)  # 模拟程序运行耗时

if __name__ == "__main__":
	with Timer("Main"):
		with Timer("Part1"):
			do_something(0.3)
		with Timer("Part2"), open("demo_file.txt", "wt") as f:
			f.write("Hello, World\n")
			do_something(2)
		do_something(1)

import time
from functools import wraps

def timer(func):
	@wraps(func)
	def inner(*args, **kwargs):
		start_time = time.perf_counter()
		retval = func(*args, **kwargs)
		time_span = time.perf_counter() - start_time
		hours, seconds = divmod(time_span, 3600)
		minutes, seconds = divmod(seconds, 60) 
		print(f"{func.__name__}耗时 {int(hours)}h {int(minutes)}m {seconds:.2f}s")
		return retval
	return inner

@timer
def do_something(nsec=0):
	if isinstance(nsec, (int, float)):
		time.sleep(nsec)  # 模拟程序运行耗时

@timer
def main():
	do_something(1)
	time.sleep(0.5)

if __name__ == "__main__":
	main()