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Week 2 Checkpoint: Lists, Loops, and Dictionaries — Python For Professionals

Day 15 · ~11 min●

Five functions, five mental shifts. filter_high_spend, compute_cpl_per_campaign, find_first_over_target, group_by_channel, channel_summary. Which one landed hardest?

Honestly, the for c in campaigns moment on Day 11 hit different. I kept waiting for the row number and it just... wasn't there. Python gave me the whole dict. I didn't need a number.

That's the exact instinct to hold onto — you're iterating the data, not the positions. What about the while loop on Day 12?

The break felt wrong at first. Like I was cheating. But find_first_over_target only needs the first match — why loop through all forty rows once you've found it? That's not lazy, that's correct.

"That's not lazy, that's correct" — I'm putting that on a t-shirt. And the dict moment?

"Dicts are just Salesforce records" — once you said that, group_by_channel was obvious. I'm looking up a field by name, not by column position. setdefault is basically IFERROR for keys that don't exist yet.

Six questions from this week and Week 1. These five functions are your collections toolkit. Let's confirm they're solid.

Quiz

0/6

6 questions80% to passretry anytime

1.What does filter_high_spend(campaigns, 5000.0) return when campaigns contains one campaign with spend = 5000.0?

def filter_high_spend(campaigns, threshold):
    result = []
    for c in campaigns:
        if c["spend"] > threshold:
            result.append(c)
    return result

A list containing that campaignAn empty listTrue5000.0

2.Given campaigns = [{"name": "Email", "spend": 1250.0, "leads": 50}], what does compute_cpl_per_campaign(campaigns) return?

def compute_cpl_per_campaign(campaigns):
    result = []
    for c in campaigns:
        cpl = round(c["spend"] / c["leads"], 2)
        result.append({"name": c["name"], "cpl": cpl})
    return result

[{"name": "Email", "cpl": 25.0}][{"name": "Email", "cpl": 25.00}][25.0]{"Email": 25.0}

3.What does find_first_over_target(campaigns, 60.0) return when campaigns have CPLs of [45.0, 72.0, 90.0]?

def find_first_over_target(campaigns, target_cpl):
    i = 0
    while i < len(campaigns):
        if campaigns[i]["cpl"] > target_cpl:
            return campaigns[i]
        i += 1
    return None

The campaign with cpl 45.0The campaign with cpl 72.0The campaign with cpl 90.0None

4.Which line correctly initialises an empty bucket for a new channel key inside group_by_channel?

def group_by_channel(campaigns):
    groups = {}
    for c in campaigns:
        channel = c["channel"]
        # ← which line goes here?
        groups[channel].append(c)
    return groups

groups[channel] = []groups.setdefault(channel, [])groups.get(channel, [])groups[channel] = {}

5.In channel_summary, a channel has total_spend = 0 and total_leads = 0. What should the CPL field in its summary dict be?

cpl = total_spend / total_leads if total_leads > 0 else None

00.0NoneZeroDivisionError is raised

6.[REVIEW] What does is_over_budget(12400.0, 12400.0) return?

def is_over_budget(spend, budget):
    return spend > budget

TrueFalse0None