{'food''spam' arguments here' sample solution remember that you have to use print to see results in the test calls because file isn' the same as code typed interactivelypython doesn' normally echo the results of expression statements in filesdef adder(xy)return print(adder( )print(adder('spam''eggs')print(adder([' '' '][' '' '])python mod py spameggs [' '' '' '' ' varargs two alternative adder functions are shown in the following fileadders py the hard part here is figuring out how to initialize an accumulator to an empty value of whatever type is passed in the first solution uses manual type testing to look for an integerand an empty slice of the first argument (assumed to be sequenceif the argument is determined not to be an integer the second solution uses the first argument to initialize and scan items and beyondmuch like one of the min function variants shown in the second solution is better both of these assume all arguments are of the same typeand neither works on dictionaries (as we saw in part iidoesn' work on mixed types or dictionariesyou could add type test and special code to allow dictionariestoobut that' extra credit def adder (*args)print('adder 'end='if type(args[ ]=type( )sum elsesum args[ ][: for arg in argssum sum arg return sum def adder (*args)print('adder 'end='sum args[ for next in args[ :]sum +next return sum integerinit to zero else sequenceuse empty slice of arg init to arg add items for func in (adder adder )print(func( )print(func('spam''eggs''toast')print(func([' '' '][' '' '][' '' ']) appendix dsolutions to end-of-part exercises