def __init__(self, screenHz=None, win=None, name='StaticPeriod'):
"""
:param screenHz: the frame rate of the monitor (leave as None if you don't want this accounted for)
:param win: if a visual.Window is given then StaticPeriod will also pause/restart frame interval recording
:param name: give this StaticPeriod a name for more informative logging messages
"""
self.status = NOT_STARTED
self.countdown = CountdownTimer()
self.name = name
self.win = win
if screenHz is None:
self.frameTime = 0
else:
self.frameTime = 1.0 / screenHz
