时间装饰器提升"'NoneType'对象不可调用"异常

Question

我有计时功能和我的主要功能.当我只使用main函数它运行正常,但当我使用计时功能作为装饰器时,它会引发异常.

定时功能码:

def timing(function):
    import time
    t = time.time()
    function()
    t = time.time() - t
    print('Program has been running for {} seconds.'.format(t))

我这样使用它:

@timing
def main():
    #some code

Answer 1

装饰器需要返回装饰函数:

def timing(function):
  def wrapped():
    import time
    t = time.time()
    function()
    t = time.time() - t
    print('Program has been running for {} seconds.'.format(t))
  return wrapped

@timing
def main():
  # some code