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Week 1 Checkpoint: Variables, Formatting, and Decisions — Python For Freelancers

Day 8 · ~11 min●

Five days, five functions. format_invoice_line, clean_client_name, format_billing_summary, is_over_hours, categorize_project_status. Which one changed how you think about your invoicing workflow?

Honestly, format_billing_summary with the total computed inside the function. I had been trusting a formula that could go stale. Now the total is always fresh.

And the formatting spec does the heavy lifting. {total:.2f} gives exactly two decimal places every time. No TEXT() formula, no manual dollar signs.

The three-tier status on Day 7 also clicked. Once I saw that "critical" only fires when both earlier conditions miss, it felt like the nested-IF logic I already know but without the angle brackets.

A nested IF that does not make your eyes bleed. High bar, cleared.

Week 1 is done. Ready to see what actually stuck.

Six questions, all drawn from this week's functions. These are your Python invoice toolkit now — let's make sure they hold.

Quiz

0/6

6 questions80% to passretry anytime

1.What does format_invoice_line('Design Studio', 95.0) return?

def format_invoice_line(name, rate):
    return f"{name} — ${rate:.2f}/hr"

"Design Studio — $95.00/hr""Design Studio — $95.0/hr""Design Studio — $95/hr""Design Studio — ${rate:.2f}/hr"

2.What does clean_client_name(' Brand_Agency ') return?

def clean_client_name(raw):
    return raw.strip().lower().replace('_', ' ')

strip(), then lower(), then split()strip() removes extra whitespace; lower() normalises caselower() changes the type from str to bytesstrip() removes trailing zeros from the rate float

3.What does format_billing_summary('Acme Corp', 3.0, 200.0) return?

def format_billing_summary(client, hours, rate):
    total = hours * rate
    return f"{client} | Hours: {hours:.1f} | Rate: ${rate:.2f} | Total: ${total:.2f}"

4.What does is_over_hours(5.0, 5.0) return?

def is_over_hours(actual, budgeted):
    return actual > budgeted

TrueFalse0None

5.What does categorize_project_status(6.5, 5.0) return?

def categorize_project_status(actual, budgeted):
    if actual < budgeted * 1.1:
        return "on track"
    elif actual < budgeted * 1.25:
        return "over by 10%"
    else:
        return "critical"

"on track""over by 10%""critical"False

6.Which f-string correctly formats the float 540.0 as "$540.00"?

f"${540.0}"f"${540.0:.2f}"f"${540.0:,}"f"${540.0:.2f,}"