从字符串到毫秒：
s = "4:34.234"
hours, minutes, seconds = (["0", "0"] + s.split(":"))[-3:]
hours = int(hours)
minutes = int(minutes)
seconds = float(seconds)
miliseconds = int(3600000 * hours + 60000 * minutes + 1000 * seconds)
从毫厘到字符串：
hours, milliseconds = divmod(miliseconds, 3600000)
minutes, milliseconds = divmod(miliseconds, 60000)
seconds = float(milliseconds) / 1000
s = "%i:%02i:%06.3f" % (hours, minutes, seconds)
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