freecodecamp--freecodecamp/curriculum/challenges/english/blocks/daily-coding-challenges-python/68f6587287ad1f4ad39b0c81.md

id, title, challengeType, dashedName

id	title	challengeType	dashedName
68f6587287ad1f4ad39b0c81	Challenge 95: Array Shift	29	challenge-95

--description--

Given an array and an integer representing how many positions to shift the array, return the shifted array.

• A positive integer shifts the array to the left.
• A negative integer shifts the array to the right.
• The shift wraps around the array.

For example, given [1, 2, 3] and 1, shift the array 1 to the left, returning [2, 3, 1].

--hints--

shift_array([1, 2, 3], 1) should return [2, 3, 1].

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(shift_array([1, 2, 3], 1), [2, 3, 1])`)
}})

shift_array([1, 2, 3], -1) should return [3, 1, 2].

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(shift_array([1, 2, 3], -1), [3, 1, 2])`)
}})

shift_array(["alpha", "bravo", "charlie"], 5) should return ["charlie", "alpha", "bravo"].

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(shift_array(["alpha", "bravo", "charlie"], 5), ["charlie", "alpha", "bravo"])`)
}})

shift_array(["alpha", "bravo", "charlie"], -11) should return ["bravo", "charlie", "alpha"].

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(shift_array(["alpha", "bravo", "charlie"], -11), ["bravo", "charlie", "alpha"])`)
}})

shift_array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9], 15) should return [5, 6, 7, 8, 9, 0, 1, 2, 3, 4].

({test: () => { runPython(`
from unittest import TestCase
TestCase().assertEqual(shift_array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9], 15), [5, 6, 7, 8, 9, 0, 1, 2, 3, 4])`)
}})

--seed--

--seed-contents--

def shift_array(arr, n):

    return arr

--solutions--

def shift_array(arr, n):
    length = len(arr)
    n = n % length
    if n < 0:
        n += length

    return arr[n:] + arr[:n]