Two rectangles
Input
sum(r.area() for r in make_rectangles([(2,3),(4,5)]))
Output
26
Areas are 6 and 20; sum is 26.
Full lesson preview
Initialize Multiple Instances with Different Data
Create a simple Rectangle class and a helper that builds many instances from input data.
Python practice15 minClasses & Objects FundamentalsIntermediateLast updated April 7, 2026
Problem statement
Implement a Rectangle class with a constructor that accepts width and height (numbers) and an area() method that returns the rectangle's area (width * height). Also implement a make_rectangles(data) function that takes a list of (width, height) tuples and returns a list of Rectangle instances, one per tuple.
Task
Implement a constructor and an instance method; write a helper function that initializes multiple instances from a list of data tuples.
Examples
Input format
A list of tuples: [(width1, height1), (width2, height2), ...]. Each number can be zero or positive.
Output format
A list of Rectangle instances from make_rectangles; area() returns numeric area. Tests will often sum areas to verify correctness.
Constraints
Widths and heights are integers (can be 0). Do not print inside the classes or helper function.
Samples
Sample 1
Input
sum(r.area() for r in make_rectangles([(7,6)]))
Output
42
Single rectangle area 7*6 = 42.