Fixed 'y' or 'yes' comparisons

[DominoPivot]

While Python supports range comparisons like a < b < c, it doesn't do anything special with the == operator, so in the comparison ask == ("y" or "yes"), the or evaluates first which results in ask == "y".

A simple fix is to use the in operator with a tuple: ask in ("y", "yes"). And hey, finally an occasion for me to test making a pull request on someone else's github :)