How did this happened?

Question

x = 0
for I in [5,4,3,2,1]:
x = x + 1
print(x)
answer is 5
can any one explain how did this happen.
Thanks in advance.

Answer 1

There are 5 items in the list so x = x + 1 is running five times.

Answer 2

you made 5 cycles in the for-loop. therefore x = 1 + 1 + 1 + 1 + 1 = 5

Answer 3

You also can write:

x=0
for i in [5,4,3,2,1]:
x += i
print(x) #output 15