प्रोग्राम की सुविधाएँ · हिस्टैरिसीस वाली सीमा अवस्थाएँ

from math import isfinite

def hysteresis(active, sample, low, high):
    if type(active) is not bool:
        raise ValueError("hysteresis.state")
    if any(type(x) not in (int, float) or (type(x) is float and not isfinite(x))
           for x in (sample, low, high)) or low >= high:
        raise ValueError("hysteresis.thresholds")
    if sample >= high:
        return True
    if sample <= low:
        return False
    return active