List loop get previous element

a_list = [1,2,3,4,5]

for index, elem in enumerate(a_list):
    if (index+1 < len(a_list) and index - 1 >= 0):
Check index bounds

        prev_el = str(a_list[index-1])
        curr_el = str(elem)
        next_el = str(a_list[index+1])

        print(prev_el, curr_el, next_el)

Source: kite.com

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