writing classes in python

1. Reflection2. Built-in methods__ Name __: Special method/Built-in method in classDouble Subscript Method Magic method1.__call__Instantiating an object ()---->> equivalent to executing the __call__ methodApplication: Used to view the execution process in the source code　　　　　　2.__len__ for viewing the length of an objectLen (object), the __len__ method that invokes object does not execute Len () if there is no __len__ error　　　　　　3.__new__------>>> Construction method__INIT__------>>> Initializat

In Python, if a method is executed in a multithreaded manner, it is simply a function object that is the first parameter of the synchronization function. However, if the function object is a static method of a class, the function object that uses the class directly will have an error. At this point, you need to construct a proxy method to implement.For example, the static class method of statistical directory size in the previous blog post, if you wan

1.class_a ()Class_b ()2.class_b using variables and functions in Class_a3. Variable class_a: class_a.num= ...function Class_b: Instantiate the class_a first (if there is initialization in class_a, then it is also initialized at this time, in order to avoid the second initialization can not write initialization in the CLASS_A as the initialization function), and then call the functionThe class_a variable used in the function called in the calling function must also be in Class_a: class_a.num= ...

#InheritanceclassPerson :defEat (self):Print("Eating ...") defRun (self):Print("runing ...")#inherited SyntaxclassStudent (person):defStudy (self):Print("study ...") STU1=Student () stu1.run ( )#rewriteclassPerson :defEat (self):Print("Eating ...") defRun (self):Print("runing ...")#subclasses overriding parent class methodsclassStudent (person):defRun (self):Print("Quick runing ...") Print("father Func") #calling a parent class method in a subclass

" "keyword argument to%s (). Don ' t do that."% (key, CLS.__name__)) if nothasattr (CLS, key):RaiseTypeError ("%s () received an invalid keyword%r. As_view" "Only accepts arguments that is already" "attributes of the class."% (CLS.__name__, key)) defView (Request, *args, * *Kwargs): self= CLS (* *Initkwargs)ifHasattr (Self,'Get') and notHasattr (Self,'Head'): Self.head=Self.get self.request=

): + " " - defining subclasses: Students $ Properties: Study number $ method: Lectures (Print: Name + School Number + "listening class") - " " - def __init__(self, Name,age, StudentID): thePerson.__init__(self, name, age) -Self.studentid =StudentIDWuyi the defLearn (self): - PrintSelf.name + str (self.studentid) +"I 'm listening ." Wu - About if __name__=="__main__": $ - #instantiate a teacher, three students, then mock the teacher class, the teacher dismissed the

" "self.miters+=add_mitersdefprint_miters (self):Print("This car has"+ STR (self.miters) +"miles on it")#Create an instanceMy_user_car = Car ('Audi','A4',' .')Print(My_user_car.get_describe_car ()) My_user_car.update_miters (200) my_user_car.print_miters () my_user_car.increment_miters (100) my_user_car.print_miters ()The new Method Increment_miters () takes a number and adds it to Update_miters () the number of miles that have been modified, we call the method Update_miters () to pass in 200, a