Python Global variables

How to share a global variable across python modules

A global variable is a variable which is accessible in multiple scopes. In Python, it is better to use a single module to hold all the global variables you want to use and whenever you want to use them, just import this module, and then you can modify that and it will be visible in other modules that do the same.

Create a Global module

Create a Python program file to access global variable

Create another Python program to test value is changed or not

Using global variables in a function

A global can be accessed by any function , but it can only be modified if you explicitly declare it with the 'global' keyword inside the function. To use global variables inside a function, you need to do global < varName > inside the function. Keep in mind, that you only need to declare them global inside the function if you want to do assignments / change them. global is not needed for printing and accessing.



Global and Local Variables in Python

Local variables

Local variables can only be reached in their scope. For ex. check with the following two local variables.



The error showing because the variable x has only local scope.

Moreover, If a variable with same name is defined inside the scope of function as well then it will print the value given inside the function only and not the global value.


Python Data Types and Variables

Python Global Keyword

Every variable in Python is considered as an object . Variables in Python follow the standard nomenclature of an alphanumeric name beginning in a letter or underscore. Based on the data type of a variable, the interpreter allocates memory and decides what can be stored in the reserved memory . You do not need to declare variables before using them, or declare their type. Variable names are case sensitive . Most variables in Python are local in scope to their own function or class.

More on.... Python Data Types and Variables

Looking for a Python job ?

Chances are you will need to prove that you know how to work with Python. These Python Interview Questions have been designed especially to get you acquainted with the nature of questions you may encounter during your interview for the subject of Python Programming . Here are the top objective type sample Python Interview questions and their answers are given just below to them. These sample questions are framed by our experts team who trains for Python training to give you an idea of type of questions which may be asked in interview.

Go to... Python Interview Questions
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