What is the expected behavior of the following code?

What is the expected out of the following code of the file named zero_length_existing_file is a zero-length file located inside the working directory?

Which of the following lines of code will work flawlessly when put independently inside the add_new () method in order to make the snippet's output equal to [0, 1, 21 ? (Select two answers)

Python's built-in function named open () tries to open a file and returns:

Assuming that the following snippet has been successfully executed, which of the equations are True? (Select two answers)