这是哪里错啦
import time
def performance(f):
def fn(*args, **kw):
t1=time.time()
r=f(*args, **kw)
t2=time.time()
print 'call %s() in %fs' % (f._name_ ,(t2- t1))
return r
return fn
@performance
def factorial(n):
return reduce(lambda x,y: x*y, range(1, n+1))
print factorial(10)