uncertainty tolerance - / / what we want / / what we get now let' return to our square root example we have loop the body of which halves the length of the interval of uncertainty we need to put this into python loop so we need corresponding loop test one typical approach is to test to see if the interval is longer than some acceptable value in this case we will demand that the interval have length no longer than - (it will take halvings to get from an initial length of to something less than - common name for an "acceptable uncertaintyis "tolerance"the amount of uncertainty we are prepared to tolerate