How to define global variable in class in python
In Python, global variables can be defined outside a class, making them accessible within the entire Python script. However, if you want to create a global variable within a class, you can use class variables. These are variables that are shared among all instances of the class. Here's a step-by-step tutorial on how to define global variables within a class in Python, along with a code example:
Understanding Class Variables:
Class variables are variables that are shared among all instances of a class. They are defined within the class but outside of any class methods. When these variables are modified, the changes are reflected across all instances of the class.
Defining a Global Variable in a Class:
To define a global variable in a class, simply declare it within the class scope but outside of any class methods.
Accessing the Global Variable:
You can access the global variable using the class name, as it is common to all instances of the class.
Here's an example demonstrating how to define a global variable within a class:
In this example, the global_var is the global variable defined within the MyClass class. It can be accessed by all instances of the class. The print_values method prints the values of the global variable and the instance variable for each object. Note that the class variable global_var is accessed using the class name MyClass.
Remember that altering the global variable using any instance of the class will affect the variable across all instances, which is a key characteristic of class variables in Python.
By following the steps outlined in this tutorial, you can effectively define and use global variables within a class in Python.
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