Is this technically a list comprehension?

Question

I have used this code to add up all numbers up to 1000, which are multiples of 3 or 5. Is this technically a list comprehension approach?

print(sum(i for i in range(1,1000) if i % 3 == 0 or i % 5== 0))

it's a generator expression. List comprehensions are inside `[...]` — Moinuddin Quadri, Jan 04 '21 at 19:05
Ref: https://www.geeksforgeeks.org/python-list-comprehensions-vs-generator-expressions/ — Karthik Radhakrishnan, Jan 04 '21 at 19:07
" A list comprehension consists of brackets containing an expression followed by a for clause, then zero or more for or if clauses. ", per [the Python docs](https://docs.python.org/3/tutorial/datastructures.html?highlight=list%20comprehension#list-comprehensions) — Jason R Stevens CFA, Jan 04 '21 at 19:07

score 8 · Answer 1 · answered Jan 04 '21 at 19:06

Technically, it's a generator expression. A list comprehension always has square brackets and results in a list being created. By contrast, a generator expression can be evaluated element by element without constructing an entire list in memory.

Here's the same code with a list comprehension:

print(sum([i for i in range(1,1000) if i % 3 == 0 or i % 5== 0]))

This would be a waste of memory as there's no reason to keep all the numbers in memory when computing their sum.

Is this technically a list comprehension?

1 Answers1