Python while loop does not terminate after exceeding range (0, 10), but for loops do. Why is that?

Question

If I use a while loop for my below code, it is not giving the desired output,

but when i use for loop i am anle to  get the output.

a = [1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89]

b = [1, 1, 2, 3, 5, 6, 7, 8, 9, 10, 11, 12, 13]

x = 0

Comm = [] #common int in both lists

while x in range(0,len(a)):

    if a[x] in b:

        Comm.append(a[x])

        x += 1

print(Comm)

Answer 1

You need to use the for loop instead of while.

If x goes from the 0 to 6, then a[6] = 13. a[6] is in b, so x becomes 7 and a[7] = 21.

a[7] is not in b, so x doesn't increase. It means that x stops at 7 and doesn't break out of the while loop.

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