Python Class Default Values

Python Class Default Values - Here s a breakdown of what this code does Line 3 defines the Point class using the class keyword followed by the class name Line 4 defines the new method which takes the class as its first argument Note that using cls as the name of this argument is a strong convention in Python just like using self to name the current instance is The method also takes args and kwargs which Note how the local assignment which is default didn t change scope test s binding of spam The nonlocal assignment changed scope test s binding of spam and the global assignment changed the module level binding You can also see that there was no previous binding for spam before the global assignment 9 3 A First Look at Classes Classes introduce a little bit of new syntax three new In Python class variables also known as class attributes are shared across all instances objects of a class They belong to the class itself not to any specific instance In Object oriented programming we use instance and class variables to design a Class Instance variables If the value of a variable varies from object to object then

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Python Class Default Values

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The module executes sequentially at run time so subsequently rebinding the name default will have no effect on the default value in init You could dynamically instantiate a new function using the previously compiled code and a new default value

If the default value of a field is specified by a call to field then the class attribute for this field will be replaced by the specified default value If no default is provided then the class attribute will be deleted The intent is that after the dataclass decorator runs the class attributes will all contain the default values for the

Consider The Following Account Class And Main Function Class Account Acct num 1000 Constructor

Consider the following account class and main function class account acct num 1000 constructor

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Because the init def is executed only once and whatever value DefaultName had at that moment has been stored away and will always be used unless you directly specify a new value when you create a new instance my instance MyClass name new name Share Follow edited Jun 3 2014 at 20 25 answered Oct 8 2011 at 15 03 Ethan Furman

My personal solution If you re just using a class variable to assign a default value to a would be Python instance variable don t use mutable values In this case every instance of Service was going to override Service data with its own instance attribute eventually so using an empty list as the default led to a tiny bug that was easily