def __init__(self):
self.str=''
self.n=0
def write(self,s):
self.str+="Out:[%s] %s\n"%(self.n,s)
self.n+=1
def show(self): #顯示函數，非必須
print self.str
def clear(self): #清空函數，非必須
self.str=''
self.n=0
f=FakeOut()
import sys
old=sys.stdout
sys.stdout=f
print 'Hello weird.'
print 'Hello weird too.'
sys.stdout=old
f.show()
# 輸出：
# Out:[0] Hello weird.
# Out:[1]
# Out:[2] Hello weird too.
# Out:[3]