Tally attendance with a dictionary

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Tally attendance with a dictionary

A dictionary counts things: start each key at 0, then add 1 for every name you see. `dict.get(key, 0)` keeps the first look-up from failing.

Definition and example

Tally attendance with a dictionary is the focus of this lesson. A dictionary counts things: start each key at 0, then add 1 for every name you see. `dict.get(key, 0)` keeps the first look-up from failing. The task asks you to apply that idea in a small example: Task: Tally attendance with a dictionary. What does this program print. Before you run the code, predict what should happen. Then Inspect the printed output and the values your program uses and compare it with your prediction. If the result differs, change one relevant line and run it again. Testing one change at a time makes the cause of a result easier to understand.

Python 1 automatic check Capstone: five small programs

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# TASK tally-attendance-with-a-dictionary-02: Task: Tally attendance with a dictionary. What does this program print?
# STEPS: Read the explanation. Change one relevant line at a time, then run the code and compare the result with the check on the right.
present = ["Ali", "Sara", "Ali", "Hina", "Ali", "Sara"]
counts = {}

for name in present:
    counts[name] = counts.get(name, 0) + 1

for name in sorted(counts):
    pass  # TODO: produce the required output for this task.

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Checks on this task:

The program output must match “Ali = 3 Hina = 1 Sara = 2”.

The task and step-by-step instructions are written as comments at the top of the editor. Change one relevant line, run it, and compare the result with these checks.

Incorrect attempts before answer: 0 / 3

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Tally attendance with a dictionary

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