import time
def performance(f):
def fn(*args, **kw):
t1 = time.time()
t2 = time.time()
print 'call %s() in %fs' % (f.__name__,(t2-t1))
return f(*args, **kw)
return fn
@performance
def factorial(n):
return reduce(lambda x,y: x*y, range(1, n+1))
print factorial(10)
2019-09-09
@performance
def factorial(n):
return reduce(lambda x,y: x*y, range(1, n+1))
这三句执行之后factorial = performance(factional)，factorial(10)实际上是fn(10)，这是performance中return fn的效果，fn(10)中return f(10)，这里执行的f(10)是factorial = performance(factional)中作为参数传入的factional，返回值为reduce(lambda x,y: x*y, range(1, n+1))，n=10的结果
举报
