range2.py

def set_range(el, val):
    minval = float(el.get_attribute("min") or 0)
    maxval = float(el.get_attribute("max") or 100)
    v = max(0, min(1, (float(val) - minval) / (maxval - minval)))
    width = el.size["width"]
    target = float(width) * v
    ac = ActionChains(driver)
    ac.move_to_element_with_offset(el, target, 1)
    ac.click()
    ac.perform()