python自定义类并使用的演示示例，python类并,class Person

python自定义类并使用的演示示例，python类并,class Person

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 += valmyPerson = Person('Raja', 'I', 'Kumar', 21)print(myPerson)myPerson.changeAge(5)print(myPerson)print(myPerson.initials())