1. brief introduction ： By the name of the class 、 Attributes and methods determine
2. Purpose ： A collection of objects with the same properties and methods
3. Ideas ：
# Define the name of a class
# Methods of building classes
# Instantiate an object
# Add class properties
# Call the class to implement the function
4. Code ：
# Define the name of a class
class student(object):
# Methods of building classes
def speak(self):
print("%s say ： I this year %s year "%(self.name,self.age))
# Instantiate an object
john=student()
# Add class properties
john.name=" John "
john.age=19
# Call the class to implement the function
john.speak()
