python declare global variable outside function
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Certainly! In Python, declaring a global variable outside a function allows you to create a variable that can be accessed and modified by any function or code block within the same module. Here's a tutorial on how to declare a global variable outside a function with code examples:
In Python, a global variable is a variable that is accessible throughout the entire program, including inside functions. To declare a global variable outside a function, you simply define it outside of any function or code block.
Let's go through the process step by step with examples:
In this example, global_var is declared outside the function, making it a global variable. The print_global_variable function can access and print the value of this global variable.
In this example, the modify_global_variable function uses the global keyword to indicate that it wants to modify the global variable global_var. After calling the function, you can see that the global variable has been modified.
While using global variables can be convenient, it's generally considered good practice to avoid them when possible. Instead, consider using function parameters to pass values between functions or use return statements to get values from functions.
In this example, the add_numbers function takes two parameters (a and b) and returns the result. This approach is more modular and can make your code easier to understand and maintain.
Remember that using global variables should be done judiciously, as overuse can lead to code that is difficult to understand and maintain. In many cases, there are better alternatives, such as passing values between functions or using class attributes.
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