Object oriented python: "Method" is defined and used

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(1) functions defined in the class, called: Method
(2) defined outside the class of functions, called: global functions

Note point method:
The first parameter (1) The method must be: self, and can not be omitted
(2) However, "method" when calling, without providing the self parameter
(3) before the method call must instantiate "class "example of embodiment: the class name
plus" () ", for example: My ()
(. 4) one unit of whole indentation, which indicates the contents belong to the class of body weight

E.g:

class ex:  #class定义一个类，类名：example
	def walk(self):     #定义一个walk方法，让类具有”散步“的能力
		print("散步：take a walk")  
	def say(self,x):    #定义一个say方法，让类具有”说话“的能力
		print(x)

ai = ex()   #实例化类（因为调用类中的方法，必须先实例化）
ai.walk()   #执行散步指令，self不用提供
y = "可以说话：i kan speak"
ai.say(y)   #执行说话指令,self在调用时，不用提供

Question 2: Argument Examples class

class exm:
	def __init__(self,x,y=0):  #初始化函数，使用内嵌函数：__init__()，进行初始化，具有两个初始化变量：x、y
		self.x = x
		self.y = y
		
	def sum(self):              #定义初始化数据的"方法（函数）"
		return self.x + self.y
a = exm(3)                         #传参数3，进行参数实例化
print("当执行参数3的类，方法结果是：",a.sum())

print('\n')

b = exm(3,7)                           #传参数3,7，进行参数实例化
print("当执行参数3,4的类，方法结果是:",b.sum())