list comprehensions

Question

i'm finding it hard to understand this list

Answer 1

name = [expression for item in iterable if condition]

is equivalent to

name = []
for item in iterable:
if condition:
name.append(expression)

Answer 2

A list comprehension is just a simplified and convenient way of generating a list, which could be written also with a for loop and if condition (in 4-5 lines)

Answer 3

I know list comprehension from Haskell (programming language). Ther it means to generate a list in passed steps (and optionally a condition), for example all elements from 0 to 20 in a step size of 2, which are lesser 10 would return [0, 2, 4, 6, 8]. How to implement it depends on the programming language...