python自定义类并使用的方法哦

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class Person:

def __init__(self, first, middle, last, age):

self.first = first;

self.middle = middle;

self.last = last;

self.age = age;

def __str__(self):

return self.first + ' ' + self.middle + ' ' + self.last +

' ' + str(self.age)

def initials(self):

return self.first[0] + self.middle[0] + self.last[0]

def changeAge(self, val):

self.age += val

myPerson = Person('Raja', 'I', 'Kumar', 21)

print(myPerson)

myPerson.changeAge(5)

print(myPerson)

print(myPerson.initials())

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Raja I Kumar 21

Raja I Kumar 26

RIK