How do you iterate over a list and produce the desired result as a tuple

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I have a question, I been trying to get this output. And I also asked a friend. But we can't get the desired output. His results is closer then mine. Anyway, my problem is that, I do not know how to iterate across the whole tuple as expected. I yet add 'List is'. My primary concern is that, am stuck at 'r,' and 'r-' and 'None'. Sorry, if my grammer is out of the window, coz it's kinda in the early morning.

Supposed output as below:

to_string Test
List is: r, i, n, g, i, n, g
List is: r-i-n-g-i-n-g
List is:

My input:

            def to_string(my_list,sep=','):

                result = ''
                index = length(my_list)

                for char in range(index):

                    result += (str((my_list[char]) + sep))

                    return result

            my_list = ['r', 'i', 'n', 'g', 'i', 'n', 'g']
            print(to_string(my_list, ''))      

My friend's input:

            #2
            def to_string(my_list,sep=','):
                print("List is :",end="")

                index=len(my_list)
                for num in range(index):
                    if num<index-1:
                        print((str(my_list[num]))+sep,end="")
                    elif num==index-1:
                        print(str(my_list[num]),end="")

                print("")

asked 40 secs ago

Macrick

17

How do you iterate over a list and produce the desired result as a tuple