Whenever I want to add functionality to a function while still allowing
it to word as it was before my edit would be to include a few optional
variables passed to the string.  something to this effect would look
like:

------------------------------------------
BEFORE:
------------------------------------------
def myfunction(a, b):
    return (a + b)
------------------------------------------
AFTER:
------------------------------------------
def myfunction(a, b, op="add"):
    if (op == "add"):
        return (a + b)
    else:
        return (a - b)
------------------------------------------

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