def stop(self):
if self._start is None:
raise TimerError(
"You must call '.start()' before calling '.stop()'.")
self._elapsed = time.time() - self._start
self._start = None
def elapsed(self):
if self._elapsed is None:
raise TimerError(
"You must call '.stop()' before trying to get the elapsed time."
)
return self._elapsed
def start(self):
if self._start is not None:
raise TimerError(
"You have already called '.start()' on this instance.")
self._start = time.time()