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Run, inspect, repair

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Practice files and reports

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Python words in plain language

Assignment and type
frames = 96 binds a name to an integer. "96" is text, not the same numeric value. Values and names.
List and index
A list keeps items in order. Positions start at zero; the final nonnegative index is length minus one. List lookups.
Loop and indentation
A for loop processes each item. Indentation groups its repeated statements; a statement outside the block runs separately. Loops.
Parameter, argument and Return
A parameter names an input in a definition; an argument supplies its value in a call. Return gives a result to the caller; print displays it. A function that only prints returns None. Functions.
Dictionary and schema
A dictionary labels values with keys. A schema states the required fields and types; a missing fact is not automatically zero. Dictionaries · Validation.
File, CSV and JSONL
A file stores bytes/text. CSV needs a quoting-aware parser; JSONL contains one JSON value per line. Browser practice files are temporary, not computer files. CSV · JSONL.
Denominator and evidence
A rate divides a count by its declared eligible total. Keep exclusions visible. A quiz score, practical check and self-review are different evidence. Quality rates.

Read the error, then make one repair

SyntaxError / IndentationError
Python could not parse the code. Inspect the named line and the preceding line for a missing colon, unmatched quote/bracket or inconsistent indentation. Review blocks.
NameError
A name has no value here. Compare case and spelling, and check that assignment happens before use. Do not replace an unknown parameter with a fixed sample.
TypeError / ValueError
A wrong kind of value or an unacceptable value can fail an operation. Inspect the supplied input and declared policy; do not broadly suppress the error. Narrow error handling.
IndexError / KeyError
The requested position or key is missing. Inspect the collection and interface instead of guessing a fallback. Indices · Keys.
Run stays loading / runtime or checker unavailable
This is not proof that your answer is wrong. Stop if available, copy your draft, check your connection and retry. If it repeats, keep the visible error and use the readable lesson/hints. Never reset or clear browser storage as the first repair.
Expected sample prints, but a check fails
Read the named contract and test changed/empty inputs. The helper may return None, use a fixed value or stop too early even when the sample looks right. A failed check is not a request to copy the expected output.

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← Route Week 3 · Day 12 of 40

Dictionaries

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Lesson idea Tap to fold
Recall

Which string method removes spaces from the beginning and end?

Show the answer

strip().

Today

Retrieve facts by meaning, not position

A dictionary groups labelled facts about one record. Braces contain key: value pairs separated by commas. Here the keys are quoted strings; values can be text, integers or booleans. This lets one record carry different types without relying on list positions.

shot["frames"] asks for the value with the exact key frames. Reordering pairs does not change that lookup. Missing or differently spelled keys raise KeyError; that is useful evidence of a contract mismatch, not a reason to invent zero. False is a boolean; "False" is nonempty text.

# Store one record with explicit value types.
shot = {"name": "Harbour Dawn", "frames": 96,
        "approved": True}

# Retrieve the named facts for the report.
print(shot["name"])
print(shot["frames"])
print(shot["approved"])

The three lines are Harbour Dawn, 96 and True. The record stores an integer count and a boolean approval, even though print displays them as text.

Read by key, update the stored frame value, fill the record scaffold, then create a different complete record. Keep the report tied to the dictionary.

Predict, explain, then test

These three brief checks are self-reviewed, not a scored quiz. Explain your answer before opening the comparison. Coding checks test the stated data contract on unfamiliar inputs.

Read a record

In {"frames": 0, "approved": False}, which value does record["frames"] retrieve?

Compare your answer · self-reviewed

The integer zero. It is not the first item by position; the quoted key chooses the value.

Distinguish types

Why is "False" not interchangeable with False?

Compare your answer · self-reviewed

The quoted version is a nonempty string, not a boolean. It may print similarly but behaves differently in a condition.

Diagnose a lookup

Why does shot["frame"] fail when the record contains "frames"?

Compare your answer · self-reviewed

The exact key is different, so Python raises KeyError. Repair the key; do not invent a zero value to hide the mismatch.

Now

Choose an exercise to load its prompt.

day-12.py standard Python · runs in this browser
Output

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