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Week 1 Checkpoint: Metrics, Strings, and Churn Logic — Python For Entrepreneurs

Day 8 · ~11 min●

Five days, five functions. format_metric, clean_customer_name, format_mrr_line, is_churned, categorize_customer. Which one surprised you most?

Honestly, format_mrr_line with the thousands separator. I had no idea one comma in a format spec was all it took — I've been doing that manually in Excel my whole career.

And now you never will again. That single :, spec replaces an entire custom number-format dialog every time. What about the branching on Day 7?

The three-tier if/elif/else felt clean. Once I saw that else fires only when every condition above it is False, it clicked. It's the same logic as a nested IF in a pivot — except readable.

A nested IF that doesn't make your eyes bleed. High bar, cleared.

Week 1 is behind me. Ready to check what actually stuck.

Six questions, all drawn from this week's code. These five functions are your Python toolkit now — let's make sure they're solid.

Quiz

0/6

6 questions80% to passretry anytime

1.What does format_metric('MRR', 14850.0) return?

def format_metric(label, value):
    return f"{label} — ${value:.2f}"

"MRR — $14850.00""MRR — $14850.0""MRR — $14,850.00""MRR — ${value:.2f}"

2.What does clean_customer_name(' ACME Corp ') return?

def clean_customer_name(raw):
    return raw.strip().lower().replace(" ", "_")

"acme_corp""Acme Corp"" acme corp ""acme-corp"

3.What does format_mrr_line('Pro', 14850.0, 150.0) return?

def format_mrr_line(plan, mrr, arpu):
    return f"{plan} | MRR: ${mrr:,.2f} | ARPU: ${arpu:.2f}"

"Pro | MRR: $14850.00 | ARPU: $150.00""Pro | MRR: $14,850.00 | ARPU: $150.00""Pro | MRR: $14,850 | ARPU: $150.00""Pro | MRR: $14,850.00 | ARPU: $150.0"

4.What does is_churned('active', 0) return?

def is_churned(status, mrr):
    return (status == "churned") or (mrr == 0)

TrueFalseNone0

5.What does categorize_customer(500.0, 1000.0) return?

def categorize_customer(mrr, plan_threshold):
    if mrr >= plan_threshold:
        return "enterprise"
    elif mrr >= plan_threshold * 0.5:
        return "mid-market"
    else:
        return "starter"

"enterprise""mid-market""starter"False

6.Which f-string correctly formats 14850 as "$14,850.00"?

f"${14850:.2f}"f"${14850:,.2f}"f"${14850:,}"f"${14850:.2f,}"