Understanding Variable Scope in Python

The video tutorial explores variable scope in Python, focusing on the differences between global and local scope. It explains how variables are stored in memory during function calls and why Python defaults to local scope. The tutorial advises against using the global keyword and emphasizes returning values from functions instead of modifying global variables. It highlights the importance of function parameters for passing information and maintaining code clarity.

What is the scope of a variable that is defined at the top level of a program?

• Block scope

• Function scope

• Global scope

• Local scope

What happens to local variables when a function call returns?

• They are saved for future use

• They disappear

• They become global variables

• They are stored in global memory

How can information be reliably communicated out of a function?

• Through the return value

• By modifying global variables

• By using global keyword

• By using print statements

Why should the use of the global keyword be avoided in Python?

• It makes the code run slower

• It can lead to conflicts with variable names

• It is not supported in Python

• It requires more memory

What is the main advantage of local scope in functions?

• It is easier to debug

• It uses less memory

• It prevents variable name conflicts

• It allows for faster execution

What happens if a function tries to access a variable that doesn't exist in any scope?

• It raises a NameError

• It creates a new variable

• It crashes the program

• It returns None

What is the risk of relying on global variables in a function?

• They can be accidentally modified

• They are slower to access

• They are not supported in Python

• They require more memory

What is a safer alternative to accessing global variables within a function?

• Passing them as function parameters

• Using global keyword

• Ignoring them

• Using them directly

What is the recommended way to handle variable values needed by a function?

• Access them directly from global scope

• Store them in a file

• Pass them as arguments to the function

• Use the global keyword

What is the best practice for designing functions in terms of scope?

• Avoid using parameters

• Use as many local variables as possible

• Think of functions as input-output machines

• Use global variables for all data