python装饰器使用实例详解

import time
def foo():
  time.sleep(1)
  
def bar():
  time.sleep(2)
  
def show_time(f):
  def inner():
    start_time = time.time()
    f()
    end_time = time.time()
    print(end_time-start_time)
  return inner
#show_time(f) is a decoration function
foo = show_time(foo)
bar = show_time(bar)

foo()
bar()

1.0011370182
2.00142788887

import time

@show_time #foo = show_time(foo)
def foo():
  time.sleep(1)
 
@show_time #bar = show_time(bar)
def bar():
  time.sleep(2)
  
  
def show_time(f):
  def inner():
    start_time = time.time()
    f()
    end_time = time.time()
    print(end_time-start_time)
  return inner
#show_time(f) is a decoration function

foo()
bar()