python how to declare global variable
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In Python, a global variable is a variable that is defined outside of any function and is accessible throughout the entire program. To declare a global variable in Python, you need to use the global keyword inside a function. This tutorial will guide you through the process of declaring and using global variables in Python with code examples.
In Python, variables defined inside a function are local to that function by default. To make a variable global and accessible throughout the entire program, the global keyword is used.
To declare a global variable within a function, use the global keyword followed by the variable name. Here's the syntax:
Once a variable is declared as global, it can be accessed from any part of the program, both inside and outside functions.
Global variables can be modified inside functions using the global keyword. However, it's essential to use caution when modifying global variables within functions.
Let's go through a simple example to illustrate the concept of global variables:
In this example, we declare a global variable global_var and then define a function update_global_variable. Inside the function, we access and modify the global variable. Finally, we call the function and print the value of the global variable both inside and outside the function.
Understanding how to declare and use global variables in Python is crucial for effective programming. By using the global keyword, you can create variables with global scope, making them accessible from different parts of your program.
This tutorial provides a basic overview of declaring and using global variables in Python. As you continue to explore Python programming, you'll encounter situations where global variables become handy, but it's essential to use them judiciously to maintain code readability and avoid unintended side effects.
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