Python Base Five, pythonbasefive

Python Base Five, pythonbasefive

// 8 day)

38. In python, it is oop.

Class Baskball:
Def setName (self, name ):
Self. name = name
Def kick (self ):
Print ('My name is % s' % self. name)
Baskball = Baskball ()
Baskball. setName ('baskball ')
Baskball. kick ()

-> My name is baskball

Class Ball:
Def _ init _ (self, name ):
Self. name = name
Def kick (self ):
Print ('My name is % s' % self. name)
B = Ball ('Tom ')
B. kick ()

-> My name is tom

 

39. In python, how to define private variable,

Such:

Class Person:
Name = 'roy'
P = Person ()
Print (p. name)

-> Roy

If you use:

Class Person:
_ Name = 'roy'
P = Person ()
Print (p. _ name) | print (p. name)

-> Error

If you use _ before variable, you can access it direct.

Class Person:
_ Name = 'roy'
Def getName (self ):
Return self. _ name
P = Person ()
Print (p. getName ())

-> Roy

Class Person:
_ Name = 'roy'
P = Person ()
Print (p. _ Person _ name)

-> Roy

 

40. inheritance mechanic

Class SubClassName :( ParentClassName ):

......

Class Parent:
Def hello (self ):
Print ('write code change World ')

Class Child (Parent ):
Pass

P = Parent ()
P. hello ()

C = Child ()
C. hello ()

->

Write code change world

Write code change world

If subclass methon is same with parent, it will cover parent method, such:

Class Child (Parent ):

Def hello (self ):

Print ('believe youself ')

C = Child ()

C. hello ()

-> Believe youself

Now we will study a simple example:

Import random as r
Class Fish:
Def _ init _ (self ):
Self. x = r. randint (0, 10)
Self. y = r. randint (0, 10)
Def move (self ):
Self. x-= 1
Print ('my position is: ', self. x, self. y)

Class Shark (Fish ):
Def _ init _ (self ):
# Fish. _ init _ (self)
Super (). _ init __()
Self. hungry = True

Def eat (self ):
If self. hungry:
Print ('eat eat ')
Self. hungry = False
Else:
Print ('not hungry ')

1, Fish. _ init _ (self)
2, super (). _ init __()

1 and 2 is same, if you not add this, you invoke move in Shark, it will error, because ,__ init _ will cover parent method, you call move (), it will not found x and y. if you use 1 and 2, it will solve this question

Multiply parent class:

Class subClassName :( parent1ClassName, parent2ClassName ):

......

Class Base1:
Def fool1 (self ):
Print ('it is fool1 ')

Class Base2:
Def fool2 (self ):
Print ('it is fool2 ')

Class c (Base1, Base2 ):
Pass

C = c ()
C. fool1 ()
C. fool2 ()

-> It is fool1

-> It is fool2