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Week 4 Quiz: Comprehensions and Composition — Python For Beginners

Day 29 · ~11 min●

Day 28 is behind you. How does the tracker feel now that you've seen it whole?

Honestly? Small. Every function is a few lines, and somehow they add up to a real working program.

That's the right read. Good software is small pieces composed cleanly — not one giant clever block. Let's see what the capstone week left in your head.

Let's finish strong.

Six questions from this week. The explainer below has the recap when you're done.

Week 4 Recap

Day 24 — extract_amounts — comprehension transform: [t["amount"] for t in txns]
Day 25 — high_value_expenses — compose filter + sort in one line
Day 26 — savings_rate — guard zero → divide → round(x, 2)
Day 27 — summarize_expenses — stack every Week 1-3 pattern into one dict
Day 28 — build_report — lines + sorted grouping + "\n".join

Ahead: a loop you can write in one line is called a comprehension — you'll see them next track.

Quiz

0/6

6 questions80% to passretry anytime

1.What does [t["amount"] for t in [{"amount": 10.0}, {"amount": 20.0}]] return?

[{"amount": 10.0}, {"amount": 20.0}][10.0, 20.0]30.0["amount", "amount"]

2.What does sorted([3, 1, 2], reverse=True) return?

[1, 2, 3][3, 2, 1]None[3]

3.What does savings_rate(0, 500) return?

def savings_rate(income, expenses):
    if income == 0: return 0.0
    return round((income - expenses) / income, 2)

-500ZeroDivisionError0.0None

4.What does summarize_expenses([]) return?

# returns {"total", "count", "average", "by_category"}

None{}ZeroDivisionError{"total": 0.0, "count": 0, "average": 0.0, "by_category": {}}

5.What does "\n".join(["April", "-----", "Total: $60.00"]) return?

"April-----Total: $60.00""April\n-----\nTotal: $60.00"["April", "-----", "Total: $60.00"]"April, -----, Total: $60.00"

6.Inside high_value_expenses, why filter the list BEFORE sorting it?

Python requires itSorting first gives a different resultFiltering first means you sort a smaller list — cheaperFilter and sort can't both be used

Day 29 · ~11 min●

Day 28 is behind you. How does the tracker feel now that you've seen it whole?

Honestly? Small. Every function is a few lines, and somehow they add up to a real working program.

That's the right read. Good software is small pieces composed cleanly — not one giant clever block. Let's see what the capstone week left in your head.

Let's finish strong.

Six questions from this week. The explainer below has the recap when you're done.

Week 4 Recap

Day 24 — extract_amounts — comprehension transform: [t["amount"] for t in txns]
Day 25 — high_value_expenses — compose filter + sort in one line
Day 26 — savings_rate — guard zero → divide → round(x, 2)
Day 27 — summarize_expenses — stack every Week 1-3 pattern into one dict
Day 28 — build_report — lines + sorted grouping + "\n".join

Ahead: a loop you can write in one line is called a comprehension — you'll see them next track.

Quiz

0/6

6 questions80% to passretry anytime

1.What does [t["amount"] for t in [{"amount": 10.0}, {"amount": 20.0}]] return?

[{"amount": 10.0}, {"amount": 20.0}][10.0, 20.0]30.0["amount", "amount"]

2.What does sorted([3, 1, 2], reverse=True) return?

[1, 2, 3][3, 2, 1]None[3]

3.What does savings_rate(0, 500) return?

def savings_rate(income, expenses):
    if income == 0: return 0.0
    return round((income - expenses) / income, 2)

-500ZeroDivisionError0.0None

4.What does summarize_expenses([]) return?

# returns {"total", "count", "average", "by_category"}

None{}ZeroDivisionError{"total": 0.0, "count": 0, "average": 0.0, "by_category": {}}

5.What does "\n".join(["April", "-----", "Total: $60.00"]) return?

"April-----Total: $60.00""April\n-----\nTotal: $60.00"["April", "-----", "Total: $60.00"]"April, -----, Total: $60.00"

6.Inside high_value_expenses, why filter the list BEFORE sorting it?

Python requires itSorting first gives a different resultFiltering first means you sort a smaller list — cheaperFilter and sort can't both be used

Day 29 · ~11 min●

Day 28 is behind you. How does the tracker feel now that you've seen it whole?

Honestly? Small. Every function is a few lines, and somehow they add up to a real working program.

That's the right read. Good software is small pieces composed cleanly — not one giant clever block. Let's see what the capstone week left in your head.

Let's finish strong.

Six questions from this week. The explainer below has the recap when you're done.

Week 4 Recap

Day 24 — extract_amounts — comprehension transform: [t["amount"] for t in txns]
Day 25 — high_value_expenses — compose filter + sort in one line
Day 26 — savings_rate — guard zero → divide → round(x, 2)
Day 27 — summarize_expenses — stack every Week 1-3 pattern into one dict
Day 28 — build_report — lines + sorted grouping + "\n".join

Ahead: a loop you can write in one line is called a comprehension — you'll see them next track.