Can you explain me this code make in phyton?

Question

y=[x for x in range (10) if x // 3 == 2]
print( sum(y)).

I know that the answer is 21 but I dont understand why. I dont understand the syntax.

I know that this code is the same that
y=0
for x in range (10):
if x//3==2:
y=y+x
print(y)

Answer 1

It's a list comprehension sir...
You better glance once that concept

Answer 2

It's a list comprehension, it's given in the solo learn course.
We can use lists operation with conditions inside "[ ]"
So when we do :
y = [ x for x in range(10) if x//3 == 2]
Y becomes a list
And y is : [6, 7, 8]
**See the course again**

Answer 3

https://www.sololearn.com/learn/JUMP_LINK__&&__Python__&&__JUMP_LINK/2454/

Answer 4

x//3 : is floor division, hope you know what that means
So when we run the loop only 3 numbers qualify the condition
6, 7 and 8 : as 6//3 = 2, 7//3 = 2 and 8//3 = 2, it's just division but just ignore whatever you have in the points, doesn't matter,
So the sun is : 6+7+8 = 21

Answer 5

That I understand, I think that your answer is for only the loop for. But the part y=[x..... I dont understand. Why is it building a list?

Please sorry my English.

Answer 6

Thanks Diego. I have not reached that concept in the course, in the first module of list do not mention this concept