Generator Expressions vs List Comprehension

Question

What is the difference between Generator Expressions and List Comprehensions in Python?

Answer 1

Generator expression resemble list comprehensions. List comprehensions are specified within [] brackets and they produce the complete list of items at once. On the other hand, generator expressions, which are specified using () brackets, return the same items but one at a time. 

EXAMPLE:

a=range(6)

print("List Comprehension", end=':')

b=[x+2 for x in a]

print(b)

print("Generator expression", end=':n')

c=(x+2 for x in a)

print(c)

for y in c:

    print(y)

OUTPUT:

List Comprehension:[2, 3, 4, 5, 6, 7]

Generator expression:

<generator object <genexpr> at 0x0000016362944480>

2
3
4
5
6