class Pepole():

    def __init__(self,name):

        self.name = name 

    def speak(self):

        print("my name is %s"%(self.name))

xiaoming = Pepole("xioaming")

xiaohong = Pepole("xioahong")

print xiaoming.speak()

print xiaohong.speak()

print (xiaoming is xiaohong)

print ("xxxxxxxxxxxxxxx")

打印：

“xioaming”

None

"xiaohong"

None

这个None是哪里打印的