Hello, >>> y=list(x).reverse() > >>> print y > None >
>>> L = ["a", "b", "c"] >>> L.reverse() >>> L ["c", "b", "a"] As you can see, L.reverse() performs the operation on itself and returns nothing. Hence, the return type None. Instead of y=''.join(list(x).reverse()) you should probably do, >>> t = list(x).reverse() >>> y = ''.join(t) Cheers! Zubin
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