What is the scope and lifetime of variables in Python?

What is the scope and lifetime of variables in Python?

In Python, the scope of a variable refers to the region of the code where the variable is accessible. The lifetime of a variable is the duration for which the variable exists in memory.

Can you explain local and global variables?

Sure! Local variables are defined within a function and can only be accessed inside that function. Global variables are defined outside any function and can be accessed throughout the entire program.

What happens to a variable when a function exits?

When a function exits, local variables are destroyed, and their memory is freed. Global variables remain in memory until the program ends.

How can I use the 'global' keyword?

You can use the 'global' keyword inside a function to modify a global variable. For example, if you want to change a global variable's value, declare it as global within the function.

Are there any best practices for variable scope?

Yes, it's best to limit the use of global variables to avoid unintended side effects. Use local variables whenever possible to keep your code modular and easier to debug.