Check your understanding of the previous reading: writing a function header, calling a function, and reading the parts of a definition.

Question 1

Identify each numbered part of the function definition and its call:

Code annotated with numbers 1 to 11: def(1) get_room(2)(name(3): str(4))(5) ->(6) int(7):(8), then the indented body(9) with a return statement whose value is room_code_number(10), then a call get_room("Smith 411") where "Smith 411" is the argument(11)

Label	Code	Part of the function
1	def
2	get_room
3	name
4	str
5	)
6	->
7	int
8	:
9	the indented lines
10	room_code_number
11	"Smith 411"

Question 2

Type the symbol that goes at the end of a function definition's header (the last character of the line that starts with def).

Show worked solution

Every header ends with a colon, e.g. def add(left: int, right: int) -> int: — the answer is :.

Question 3

What does the pass statement do?

Select one answer, then check.

Absolutely nothing
Correct. pass only fills in a body that would otherwise be empty; it has no effect when it runs.
Passes a value to a function
Not quite. Passing a value to a function is what an argument in a function call does; pass is a statement inside a body.
Passes the result of the function back to where it was called
Not quite. That's what a return statement does.

Question 4

Mark all of the following that ARE advantages of functions.

Select every answer that applies, then check.

Make it easy to reuse code
Correct. Code reuse is one of the three advantages from the reading.
Code in a function executes faster
Not an advantage. Calling a function has a small overhead of its own; functions are not a speed optimization.
Easier to debug code in a function because it is isolated
Correct. You can test and debug a function on its own, separately from the rest of the program.
Functions allow us to store values in variables.
Not an advantage of functions specifically. Storing values in variables works the same whether or not functions exist.

Question 5

Given the function definition below, what is the name of the function?

def get_area(width: int, height: int) -> int:
    return width * height

Show worked solution

The name comes right after def, before the opening parenthesis: get_area.

Question 6

What type of thing is returned from the function below?

def is_on_fire() -> bool:
    return True

Select one answer, then check.

Boolean
Correct. The return type in the header is bool, and the value returned, True, is a Boolean.
String
Not quite. A string would be written in quotes, and the header says bool.
Function
Not quite. is_on_fire is the function; the value it returns is a Boolean.
None
Not quite. The function explicitly returns True, not None.
True
Close, but the question asks for the type of thing returned, not the value. True is a value of type Boolean.
False
Not quite. The function returns True, and the question asks for the type anyway, which is Boolean.

Question 7

Every function must return an integer or string.

Select one answer, then check.

True
Not quite. A function can also return a float, a Boolean, or None — the reading's own examples return float and bool.
False
Correct. Functions can return any type — int, str, float, bool, or None — or nothing at all (which returns None).

Question 8

Question 9

Question 10

Read the following code, and then fill in the blanks below.

1| def f(x:int) -> int:
2|     x = x + 1
3|     return x
4| val = 0
5| y = f(val)
6| print(y)

You can run the code on Python Tutor to step through and see what happens.

The line executed first is line . The line executed second is line . After line 3 is executed, the next line executed is line .

Word bank — not all numbers are used

Question 11

You have been tasked with creating a function that opens a garage door. Which of the following are good, valid names?

Pick every name below that is both syntactically valid Python and a good choice.

Select every answer that applies, then check.

ogd, a short abbreviation that saves many letters when typing.
Valid Python, but not a good name: ogd doesn't tell another programmer what the function does.
open_garage_door, a concise name that captures the idea
Correct. Valid characters only, starts with a verb, and it's clear what the function does.
open garage door, a concise name that captures the idea
Not valid. Function names can only contain letters, numbers, and underscores — spaces aren't allowed.
door, a short name that saves many letters while typing
Valid Python, but not a good name: it's a noun, not a verb, so it doesn't say what action the function performs.
openThePodBayDoorsHal, a fun reference to a classic sci-fi movie
Valid Python, but not concise — a good name captures the idea briefly, not with a full quoted line.