执行结果是.....Person .....Student None，这个None是怎么出来的
class Person(object):
print '.....Person',
class Student(Person):
def skill(self):
print '.....Student',
s = Student()
print s.skill(),
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class Person(object):
print '.....Person',
class Student(Person):
def skill(self):
print '.....Student',
s = Student()
print s.skill(),
2017-08-10
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