Program1.1

 1 class MyClass:
 2     
 3     i = 12345
 4     
 5     def __init__(self):
 6         self.data = "WOOWOWOWO"
 7     
 8     def f(self):
 9         return 'Hello World'
10     
11     def New(self,W = '1',N = '2', x = 33):
12         self.W = 'lla is W'
13         self.N = 'lll'
14         return W,N,x
15     
16     def x(self,ss = 1,dd = 2):
17         return ss,dd
18     
19 x = MyClass()
20 print(x.f())
21 print(x.i)
22 print(x.New())
23 print(x.New('张','三'))
24 print(x.x())


The output is:

Hello World
12345
('1', '2', 33)
( ' Photos ' , ' three ' , 33 )
(1, 2)

If print (xW) will be given:

Traceback (most recent call last):
  File "E:/PyPrograms/Unit1/Day03/Class_1.py", line 22, in <module>
    print(x.W)
AttributeError: 'MyClass' object has no attribute 'W'

If you use

    def New(self,W = '1',N = '2', x = 33):
        self.W = 'lla is W'
        self.N = 'lll'
        return W,N,x

    def x(self,ss = 1,dd = 2):
        return ss,dd

It will return output

('1', '2', 33)
( ' Photos ' , ' three ' , 33 )
(1, 2)

For Python, is not to create any parameter passing, passing a address in the method, but this can not be used directly by the object p.address, can only be used when calling speak of

. 1  class people:
 2      # defines the basic properties of 
3      # define private property, private property can not be directly accessed from outside the class 
4      # define constructor 
. 5      DEF  the __init__ (Self, n-, A, W):
 . 6          the self.name = n-
 . 7          Self = .age A
 . 8          Self. __weight = W
 . 9  
10      DEF Speak (Self, address):
 . 11          self.address = ' Lala ' 
12 is          Print ( " % S says:% d years old I S% " %(self.name, self.age, self.address))
 13  
14 the p-people = ( ' runoob ' , 10, 30 )
 15 p.speak ( " ZZ " ) 


output:
　　runoob said: I am 10 years old. lala

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