3 examples of 'how to make a stopwatch in python' in Python

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def StopWatch(tens_led, ones_led, tenths_led, startstop, reset, clock):
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    """ 3 digit stopwatch with seconds and tenths of a second.
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    tens_led: 7 segment led for most significant digit of the seconds
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    ones_led: 7 segment led for least significant digit of the seconds
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    tenths_led: 7 segment led for tenths of a second
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    startstop: input that starts or stops the stopwatch on a posedge
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    reset: reset input
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    clock: 10Hz clock input
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    """
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    tens, ones, tenths = [Signal(intbv(0)[4:]) for i in range(3)]
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    timecount_inst = TimeCount(tens, ones, tenths, startstop, reset, clock)
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    bcd2led_tens = bcd2led(tens_led, tens, clock)
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    bcd2led_ones = bcd2led(ones_led, ones, clock)
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    bcd2led_tenths = bcd2led(tenths_led, tenths, clock)
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    return timecount_inst, bcd2led_tens, bcd2led_ones, bcd2led_tenths

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def start(self):
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	"""Start the stopwatch if not started already."""
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	if not self.Running:
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		self._beg = time.time()
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		self._running = True

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def update_stopwatch(self):
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    self.stopwatch.update(delta=0.1)
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    self.after(100, self.update_stopwatch)
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    # Update timer label
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    self.w_timer['text'] = self.stopwatch.display()