Simple problem with functions and returns

[GOTO10]

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Your function menu() is going to return either an integer value or None if the input is invalid. You could assign this value to a variable and then pass it to started(), or you could pass it directly:

# Assign the value returned by menu() to a variable and then call started()
op = menu()
started(op)

# Pass the value returned by menu() directly
started(menu())

Also, to simplify your code in the menu function, you can do just a single comparison to determine if the input is what you expect before returning. (Note that your current code would throw an error if the user enters a non-integer value, by the way.)

if 1 <= option <=5:
    return option
else:
    print("Invalid selection")
    return