Python Learning Notes (eight) object-oriented extension

Original chain: http://www.cnblogs.com/vamei/archive/2012/06/02/2532018.html

NOTES: Today's content feels like it's not easy to understand

1 #when I learned to define my move yesterday, I used self.2 " "3 def Bird (object):4 Have_feather = True5 way_of_reproduction = ' egg '6 7 summer = Bird8 print (summer.way_of_reproduction)9 " "Ten #There's an error here. One #attributeerror: ' function ' object has no attribute ' way_of_reproduction ' A #The define used above, the class that was used yesterday, the above are annotated, the following re - -  - classBird (object): theHave_feather =True -Way_of_reproduction ='Egg' -  -Summer =Bird + Print(summer.way_of_reproduction) -  + #print is egg, normal, next step. A #and then the summer into a movable chicken. at " " - class Bird (object): - Have_feather = True - way_of_reproduction = ' egg ' - def move (self, x, y): - position = [0, 0] in position[0] = position[0] + x - position[1] = position[1] + y to return position +  - summer = Bird the Print (Summer (5,8)) * " " $ #again the error ... Typeerror:object () takes no parametersPanax Notoginseng #Forget summer.move. - #It also shows that the def move has become a bird attribute . the " " + class Bird (object): A Have_feather = True the way_of_reproduction = ' egg ' + def move (self, x, y): - position = [0, 0] $ position[0] = position[0] + x $ position[1] = position[1] + y - return position -  the summer = Bird - Print (Summer.move (5, 8))Wuyi #TypeError: Move () Missing 1 required positional argument: ' Y ' the # .... Don't know what to say, yesterday all normal printing ah - " " Wu  - classBird (object): AboutHave_feather =True $Way_of_reproduction ='Egg' -     defMove (self, x, y): -Position =[0, 0] -Position[0] = position[0] +x APOSITION[1] = position[1] +y +         returnposition the  -Summer =Bird () $ Print(Summer.move (5, 8)) the #Bird behind the short brackets .....  the #here is the introduction of self the  the #written by: - #Self represents an object. Object has all the properties of a class, then we can invoke the Class property through self in  the " " the class Human (object): About laugh = ' hahahaha ' the def show_laugh (self): the print (Self.laugh) the  + #因为我们上面发现, Def Move,summer.move can invoke the properties of the move - #那这里, the author used Self.laugh to do a test . the Li_lei = Human ()Bayi print (Li_lei.laugh) the #输出结果: Hahahaha the #然后print (Li_lei.show_laugh) - #然后就 ... It's crazy. - #输出: <bound method Human.show_laugh of <__main__.human object at 0x000002a28d83ec50>> the #不懂, keep reading the author . the " " the  the classHuman (object): -Laugh ='Hahahaha' the     defShow_laugh (self): the         Print(Self.laugh) the     deflaugh_100th (self):94          forIinchRange (100): the Self.show_laugh () the  theLi_lei =Human ()98 li_lei.laugh_100th () About  - #This is the author's101 #print (li_lei.laugh) #输出是hahahaha102 #Direct Li_lei.laugh #输出是 ' hahahaha ', is the string? 103 #It was later understood that the summer.way_of_reproduction output was ' egg '104  the #print (Li_lei.show_laugh ()) #输出是hahahaha None106 #Li_lei.show_laugh () #输出是hahahaha107 108 #print (li_lei.laugh_100th ()) #输出是100个 hahahaha None109 #li_lei.laugh_100th () #输出是100个 hahahaha the 111 #There is no understanding .... Why? What is None?  the 113 #laugh is a property of the human class, and self is an object that has all the properties of the class the #Self is the property of human . the #defines the Show_laugh function, in which self uses the laugh attribute the #laugh_100th with Show_laugh function, Show_laugh function is Self.laugh, that is human laugh117 118 #I don't know if that's the right thing.119  - 121 122 123 124 #Special Methods Special method the classHappybird (bird):#Happybird inheriting bird properties126     def __init__(self, more_words):127         Print('We are happy birds.', More_words) - 129Summer = Happybird ('Happy, happy!') the #do not get init int ha, error .... 131 #automatic invocation, process called initialization the #Execute summer.__init__ (more_words), put happy, happy handed to More_words133 #__init__ () automatically executes when an object is created

Legacy: The nature of an object

Python Learning Notes (eight) object-oriented extension