Check if a value still remains the same in a While loop Python

Question

I want know if there is a elegant method for looking if a value that continually changes in a while loop can be checked and stop the while loop if the value stops change and rem

Answer 1

A more portable solution would be to make this a class so that an instance holds on to the previous value. I also had a need for a fuzzy match so I included that in the below example.

class SamenessObserver:
    """An object for watching a series of values to see if they stay the same.
    If a fuzy match is required maxDeviation may be set to some tolerance.

    >>> myobserver = SamenessObserver(10)
    >>> myobserver.check(9)
    False
    >>> myobserver.check(9)
    True
    >>> myobserver.check(9)
    True
    >>> myobserver.check(10)
    False
    >>> myobserver.check(10)
    True
    >>> myobserver.check(11)
    False
    >>> myobserver = SamenessObserver(10, 1)
    >>> myobserver.check(11)
    True
    >>> myobserver.check(11)
    True
    >>> myobserver.check(10)
    True
    >>> myobserver.check(12)
    False
    >>> myobserver.check(11)
    True
    >>> 

    """

    def __init__(self, initialValue, maxDeviation=0):
        self.current = 0
        self.previous = initialValue
        self.maxDeviation = maxDeviation

    def check(self, value):
        self.current = value
        sameness = (self.previous - self.maxDeviation) <= self.current <= (self.previous + self.maxDeviation)
        self.previous = self.current
        return sameness