Python constructor __new__ (cls[,...]), destructor __del__ ()

1 class capstr (str): 2     def __new__ (cls,string): 3         string=string.upper ()4         return str.__new__(cls,string)  56 a=capstr ('ifuckyou')7 Print A

__NEW__ is the establishment of a constructor-------instance object

Inherits the String class str, capitalizes the string, and returns the processed uppercase string with str.__new__ ()

Unlike __init__ (), Init is the initialization function, new is the constructor, a function that actually returns an instance object, and Init does not return an instance object

__del__ when an instance object is to be deconstructed

When an object is to be destroyed, __del__ () is called

There are some thoughts on the understanding of the structure function.

Python constructor __new__ (cls[,...]), destructor __del__ ()