__ str__ Output class

class Cat:
    """ Define a cat class """
 
    def __init__(self, new_name, new_age):
        """ After creating the object   Automatically called ,  It completes the function of object initialization """
        # self.name = " Tom "
        # self.age = 20
        self.name = new_name
        self.age = new_age  #  It is an attribute in an object , Store... In an object , That is, as long as the object still exists , Then this variable can be used 
        # num = 100 #  It's a local variable , When this function is executed , There is no space for this variable , Therefore, other methods cannot use this variable 
 
    def __str__(self):
        """ Returns the description of an object """
        # print(num)
        return " The name is :%s ,  Age is :%d" % (self.name, self.age)
 
    def eat(self):
        print("%s Eating fish ...." % self.name)
 
    def drink(self):
        print("%s Drinking coke ..." % self.name)
 
    def introduce(self):
        # print(" The name is :%s,  Age is :%d" % ( Tom's name ,  Tom's age ))
        # print(" The name is :%s,  Age is :%d" % (tom.name, tom.age))
        print(" The name is :%s,  Age is :%d" % (self.name, self.age))
 
#  Created an object 
tom = Cat(" Tom ", 30)
print(tom)