Multiple & Nested Conditionals Practice

Instructions

Quick review

age >= 13 and age <= 19    # both True
day == "Sat" or day == "Sun"  # at least one
not is_raining              # flips it

if temp < 50:
    print("jacket")
if is_raining:
    print("umbrella")

if has_key:
    if level >= 5:
        print("Door opens")
    else:
        print("Level up")
else:
    print("Find the key")

• and is True only when both sides are True. or is True when at least one side is True. not flips True and False.
• Order of operations: parentheses, then math, then comparisons, then not, then and, then or. Use parentheses to group parts that belong together.
• Write a complete comparison on each side: color == "red" or color == "blue", not color == "red" or "blue". And age >= 13 and age <= 19, not age >= 13 and <= 19.
• Separate if statements are all checked, so several can run. An if-elif-else chain runs only the first True branch.
• In a nested if, the inner if is only checked when the outer condition is True. Each level adds 4 more spaces, and each else belongs to the if it lines up with.

Error messages you may see in the terminal

• SyntaxError: invalid syntax can mean half a comparison (x >= 1 and <= 10), or AND, &&, or || instead of and / or.
• IndentationError: expected an indented block after 'if' statement on line 5 means the line after an if is not indented further.
• IndentationError: unindent does not match any outer indentation level means an else (or another line) does not line up with any level above it.
• No error at all is possible too! The or trap and missing parentheses run without an error but give the wrong answer. Compare your output with the expected output.

How this works

1. Enter your first name, last name initial, and class period, then click Start Assignment. Your start time is recorded.
2. The assignment opens in a Python editor with four files (tabs). Each orange numbered box or drop down is one practice item. There are 30 items.
3. 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, so you can check your predictions. Run does not grade you, so check your work carefully.
4. 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.

Student Information