field | Method | Properties | Members of the Class | Python

#-----------------------------------------FieldclassClass:#static fields, belonging to class    #has been created and stored in the class, not every creation of an object created once;Country ='China'    def __init__(self, name):#normal field-->> saved in the created objectSelf.name =name#Common method-->> saved in class    defShow (self):Print(Self.name)#instantiating an objectobj= Class ('Mic')Print(Obj.name) obj.show ()#getting static fields from class objectsPrint(class.country)#print (class.name) # Normal fields are stored in the object and cannot be accessed through the class;#objects can be accessed to static properties through class object pointers (references)Print(Obj.country)

#------------------------------Methodclassmethodtest ():#Common Methods    defTest1 (self):#Self refers to the created object        Print('run-------1')    #Static Methods@staticmethoddefTest2 ():#Self is not necessary at this time, of course, if you write, you need to pass in a parameter        Print('run-------2')    #class Method@classmethoddefTest3 (CLS):#The CLS parameter passed in here is the class name that Python automatically passes in        Print(CLS)Print('run-------3')#-----------------Call the normal method#1. Create an object that accesses the normal methods in the class indirectly through the objectobj =methodtest () obj.test1 ( )#2. Direct access to the normal method, but only if an object is created first#because the first argument of the normal method is self, it refers to the created objectmethodtest.test1 (obj)#------------------Call a static method#class is called directly, similar to writing a function, after all, creating an object consumes the contentMethodtest.test2 ()#----------------Calling class methodsmethodtest.test3 ()#when do you use them separately?#1. We need to use the value in the object, the common method is used;#2. If you do not need the values in any objects, use static methods;#3. In fact, if you need to use the class name in a static method, passing in as a parameter is equivalent to a class method;#that is, a class method can be constructed entirely by a static method.#and there is little need to use the class name in the method, so it is not necessary for the class method

#------------------------------PropertiesclassAttr (): @propertydeftest4 (self):Print('run-------4')        return 'Run4'@test4. Setterdeftest4 (self, param):Print(param) @test4. deleterdeftest4 (self):Print('Delete------4') obj=Attr ()#obj.test4 () # errorObj.test4Print(OBJ.TEST4)#Assign ValueObj.test4 ='Change_val'#print (OBJ.TEST4) # error#What if you must assign a value?Print(OBJ.TEST4)#DeletedelObj.test4#>>> doesn't actually modify this field,#only through such operation, the corresponding adorner method is executed;#is a correspondence relationship;

#-----------------using the property decorator to complete the paging effectclassPaginator (object):def __init__(self, current_page):Try: P=Int (current_page)exceptException as E:p=1Self.page=P @propertydefStart (self): Val= (self.page-1) * 10returnVal @propertydefEnd (self): Val= self.page*10returnVala=list () forIinchRange (1000): A.append (i) whiletrue:p= Input ('Please enter the page you are viewing:') obj=paginator (P)Print(A[obj.start:obj.end])

#---------------------------Use property () to complete the above effectclassClassfunc ():deftest1 (self):return 'Mic'    deftest2 (self, param):Print(param)deftest3 (self):Print('del') per= Property (Fget=test1, Fset=test2, fdel=test3) obj=Classfunc ()#1. Calling Methods#ret = Obj.per#print (ret)#2. Assigning Values#obj.per = ' Mic '#3. DeletedelObj.per

field | Method | Properties | Members of the Class | Python