Python Deeply Nested Conditionals (2 to 4 Levels)

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Instructions

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Quick review

Four levels deep

if power_on:                    # level 1
    if battery >= 20:           # level 2
        if mode == "auto":      # level 3
            if room == "den":   # level 4
                print("Clean")
            else:
                print("Skip")

Count the spaces

# Each level adds 4 spaces.
# The code INSIDE an if at
#   level 1 starts at 4 spaces
#   level 2 starts at 8 spaces
#   level 3 starts at 12 spaces
#   level 4 starts at 16 spaces

Complex conditions at any level

if has_ticket:
    if age >= 18 or with_parent:
        if not sold_out:
            print("Enjoy the show")
# Parentheses group parts:
# weekend and (sunny or warm)

Trace from the top. Python only goes into an if when its condition is True. If it is False, Python skips everything indented under it, no matter how deep, and jumps to the matching elif / else.
An else or elif belongs to the if it lines up with. Line up your finger with the else and move straight up until you hit an if. That is its partner.
and is True only when both sides are True. or is True when at least one is True. not flips True and False. Python does not first, then and, then or, so use parentheses to group an or that belongs together.
Write a complete comparison on each side: size == "small" or size == "medium", not size == "small" or "medium" (the or trap).

Error messages you may see in the terminal

IndentationError: expected an indented block after 'if' statement on line 7 means the line after an if is not indented further than the if.
IndentationError: unindent does not match any outer indentation level means a line does not line up with any level above it. Use exactly 4 spaces per level.
SyntaxError: invalid syntax on an else can mean that if already has an else, so this else is lined up with the wrong if. It can also mean half a comparison, like hour >= 9 and < 17.
No error at all is possible too! The or trap, and vs. or, > vs. >=, and missing parentheses all run but give the wrong answer. Compare your output with the expected output.

How this works

Enter your first name, last name initial, and class period, then click Start Assignment. Your start time is recorded.
The assignment opens in a Python editor with four files (tabs). Each orange numbered box or drop down is one item. There are 20 items.
Click ▶ Run on any part to see what Python prints. On Parts 1 to 3, compare it with the expected output. On Part 4, Run shows what each small program prints. Run does not grade you, so check your work carefully.
When you finish all four tabs, click Submit for Score. Your end time is recorded and your score appears. Answers cannot be changed after submitting.

Turning it in: save a PDF (required for a grade)

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In the print window, set Destination to Save as PDF (not a printer), then click Save.
Keep the file name it suggests. It already has your name and period, for example Deep_Nested_Conditionals_Maria_R_P3.pdf.
Turn in the PDF where your teacher tells you to.

Do not refresh or close the page until your PDF is saved. Nothing is stored, so if you leave first you will have to do the assignment again. The PDF shows your name, period, times, score, every answer, and your completed code.

Part	Task	Items	Points
1	Complex conditions inside nests that are 3 and 4 levels deep	1 to 5	5
2	Build deep nests: else / elif, and the right number of spaces at each level	6 to 10	5
3	Debug: fix the condition at levels 2 to 4	11 to 15	5
4	Predict the output of 3 and 4 level programs	16 to 20	5
	Total (1 point per item)	20	20

Student Information

Student:

Period:

Date:

Start:

Elapsed: 00:00

Items answered: 0 of 20

deep_nested_conditionals — Python 3

Task: Each program has a comment that says what it should do. Choose the right logical operator, or type the condition.

Items 2 and 4: type the whole condition.
Item 5: type the whole if line. The 8 spaces in front are already there.

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Task: Complete each nest. Count the levels: every level adds 4 spaces.

Items 8 and 10 already have code in them, but the indentation is wrong. Fix the spaces at the start of the line.
Item 9: type the whole print line, including the spaces in front of it.

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Task: Each condition in an orange box has one bug. Some cause an error, and some run but give the wrong answer. Fix each condition so the program does what the comment says.

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Task: Trace each program in your head and choose what it prints. Go one level at a time: if a condition is False, skip everything indented under it. Line up each else with its if.

TerminalProblemsOutput

Your Score

Student

Period

Date

Start time

End time

Time spent

#	Question	Your answer	Correct answer	Points	Feedback

Your completed code

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