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Multi-branch selection and readable code

Use if–elif–else when exactly one of several ordered alternatives should run. Python tests conditions from top to bottom and stops at the first true branch.

1. Order broad thresholds carefully

To classify a mark:

if mark >= 70:
    grade = "Distinction"
elif mark >= 50:
    grade = "Pass"
else:
    grade = "Not yet"

A mark of 78 satisfies both >= 70 and >= 50, but the first true branch wins. Put the highest threshold first.

Fill in the blanks3 marks

With the model, mark 78 gives gap 1, mark 50 gives gap 2, and mark 49 gives gap 3.

Distinction
Pass
Not yet
two outputs

Written answer2 marks

Explain the logic error if mark >= 50 is tested before mark >= 70 in the same chain.

Use a mark such as 78 and the first-true-branch rule.

Students type their answer here.

2. Readability supports correctness

Pearson expects meaningful identifiers, indentation, comments where they clarify purpose, and sensible white space. These do not replace correct logic, but they help a programmer follow, test and maintain it.

Prefer ticket_price to x; align every statement in the same block; and comment the reason for an unusual rule rather than narrating obvious syntax.

Multiple choice1 mark

Which comment adds the most useful information?

A`# if statement` above an if statement
B`# add one` above `count = count + 1`
C`# Under-12s use the junior price` above the age rule
D`# print` above a print statement

3. Complete an ordered chain

Create category from integer age: Adult for 18 or above, Teen for 13–17, otherwise Child. Output only the category.

Coding task4 marks

age = 15
# Create category and output it.

4. Independent multi-branch program

Input integer items. Set delivery to Large van for 50 or more, Small van for 20–49, and Bike otherwise. Output only delivery. It will be tested at 50, 20 and 19.

Coding task5 marks

# Input items, classify delivery, and output it.

5. Nested selection

A nested if sits inside another branch. Use it only when the second decision is relevant after the first. Excessive nesting makes code harder to follow; a well-ordered elif chain is clearer for mutually exclusive thresholds.

Multiple choice1 mark

Which structure best classifies one score into Bronze, Silver or Gold?

AThree unrelated if statements
BOne if–elif–else chain
CA while loop containing an if
DAn input statement for each category

Written answer3 marks

Give two readability improvements for code that uses variables a and x, inconsistent indentation, and a comment # code.

State each improvement and how it helps a reader.

Students type their answer here.

Multiple choice1 mark

In an if–elif–else chain, what happens after one condition is true?

AEvery later condition is still tested.
BOnly the else branch runs as well.
CThe remaining branches are skipped.
DThe program returns to the first condition.

Route forward

You can now design ordered, readable multi-branch selection. Next, logical operators combine or reverse conditions without unnecessary nesting.