[SOLVED] Can someone please explain to me why the output of following code is 55?

Question

sum = 0
x = 10
while x > 0:
sum += x
x -= 1

print(sum)

Answer 1

In each iteration of the while loop, a number is added to sum, and the number is decremented by 1 until it reaches 0.
So the result is
sum = 10+9+8+7+6+5+4+3+2+1