class Person:
def __init__(self,name, age):
#fill your code
self.__name=name
self.__age=age
@classmethod
def from_string(cls, person_str):
#fill your code
a,b=map(str,person_str.split(','))
return '{} is {} years old'.format(a,b)
def __str__(self):
#fill your code
return '{} is {} years old'.format(self.__name,self.__age)
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