TypeError init should return None not X Python
The init method is used to set the supplied values on the instance and shouldn t return a value If we return a value other than None from a class s init method a TypeError is raised
Python Class Constructors Control Your Object Instantiation, Getting to Know Python s Class Constructors Understanding Python s Instantiation Process Object Initialization With init Providing Custom Object Initializers Building Flexible Object Initializers Object Creation With new Providing Custom Object Creators Subclassing Immutable Built in Types Returning Instances of a Different Class
Is it a good practice to declare instance variables as None in a class
Aug 27 2014 at 11 24 17 By the way using a proper python IDE e g PyCharm setting the attributes in the init already provides autocompletion etc Also using None prevents the IDE to infer a better type for the attribute so it s better to use a sensible default instead when possible Bakuriu Aug 27 2014 at 17 39
Dataclasses Data Classes Python 3 12 1 documentation, Init If true the default a init method will be generated If the class already defines init this parameter is ignored repr If true the default a repr method will be generated The generated repr string will have the class name and the name and repr of each field in the order they are defined in the class
Python Class Constructor Python init Function AskPython
Python Class Constructor Python init Function AskPython, 1 Class with No Constructor We can create a class without any constructor definition In this case the superclass constructor is called to initialize the instance of the class The object class is the base of all the classes in Python class Data pass d Data print type d class main Data
Python Class self init self init 013 Python
Explicit return in init Python Anti Patterns documentation
Explicit return in init Python Anti Patterns documentation The init method of the Rectangle class below attempts to return the area of the rectangle within the init method This violates the rule of only using init to initialize instance members
Real Python Using Python Class Constructors Community Where You Can
9 Classes Classes provide a means of bundling data and functionality together Creating a new class creates a new type of object allowing new instances of that type to be made Each class instance can have attributes attached to it for maintaining its state Class instances can also have methods defined by its class for modifying its state 9 Classes Python 3 12 1 documentation. 3 Answers Sorted by 48 You ll have to use a new method by the time init is called a new instance has already been created class User object def new cls name password if name and password instance super User cls new cls instance name instance password name password return instance init method in Python is used to initialize objects of a class It is also called a constructor To completely understand the concept of init method you should be familiar with Prerequisites Python Class and Objects Self What is init in Python init method is like default constructor in C and Java
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