Why does this python left rotation of an array not work

Now that you have solved it, I can add a couple of other solutions.

First a simple one:

def rotLeft1(a):
    return a[1:] + [a[0]]

def rotLeft(a, d):
    for _ in range(d):
        a = rotLeft1(a)
    return a

Then one that doesn't make one step at a time:

def rotLeft(a, d):
    i = d % len(a)
    return a[i:] + a[:i]

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