在模型训练或数据处理中，常常涉及代码段的计时，这里给出优雅的计时器实现。
例子一，作为上下文管理器，
import urllib.request as request
from pytimer import Timer
def task(n):
for _ in range(n):
request.urlopen("https://httpbin.org/")
with Timer(label="request url") as timer:
task(5)
print(timer.elapsed)例子二，作为装饰器，
import urllib.request as request
from pytimer import Timer
@Timer(label="time url request")
def task(n):
for _ in range(n):
request.urlopen("https://httpbin.org/")
task(1)例子三，在类中使用，
import urllib.request as request
from pytimer import timethis
class Task:
@timethis(label="time instance method")
def urlopen1(self, url):
request.urlopen(url)
@classmethod
@timethis(label="time class method")
def urlopen2(self, url):
request.urlopen(url)
@staticmethod
@timethis(label="time static method")
def urlopen3(url):
request.urlopen(url)
task = Task()
task.urlopen1("https://httpbin.org/")
task.urlopen2("https://httpbin.org/")
task.urlopen3("https://httpbin.org/")
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