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in python 3 Given a string, return a new string where the first and last chars...

in python 3 Given a string, return a new string where the first and last chars have been exchanged.

PLEASE WITH EXPLANATION I AM CONFUSED

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Answer #1
def exchange_first_last(s):
    first = s[0]  # get first characters
    middle = s[1:-1]  # get middle characters
    last = s[-1]  # get last characters
    return last + middle + first


# Testing the function here. ignore/remove the code below if not required
print(exchange_first_last('hello'))
print(exchange_first_last('hi'))
print(exchange_first_last('good'))
print(exchange_first_last('morning'))

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