Summary - List comprehension

Combine comprehension and generator expressions to write a number processor.

Summary - List comprehension

In this group we covered comprehension, filtering, dict/set, nested and generator.

List: [expr for n in list]
Filter: add ... if condition
Dict: {key: value for ...}
Set: {expr for ...}
Generator: (expr for ...)

Now two tasks combine these concepts.

Exercise Squares of even numbers

Assign to even_squares a comprehension that squares the even numbers from [1, 2, 3, 4, 5, 6]. Then print print(even_squares).

Show example solution

even_squares = [n * n for n in [1, 2, 3, 4, 5, 6] if n % 2 == 0]
print(even_squares)

Exercise Dict and sum together

Assign to squares a dict comprehension holding n: n * n for each n in [1, 2, 3]. Assign sum(squares.values()) to total. Then print print(squares, total).

Show example solution

squares = {n: n * n for n in [1, 2, 3]}
total = sum(squares.values())
print(squares, total)

Test yourself

Which comprehension gives [6, 8]?
- [n * 2 for n in [1, 2, 3, 4]]
- [n * 2 for n in [1, 2, 3, 4] if n > 2]
- [n + 2 for n in [1, 2, 3, 4] if n > 2]
- [n for n in [6, 8]]
Show answer

[n * 2 for n in [1, 2, 3, 4] if n > 2] — 3 and 4 are taken, doubled to [6, 8].

Complete max with a generator

biggest = max(n * n for n in [____])

Show answer

biggest = max(n * n for n in [5])

Next lesson: Tuple

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