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* The precision of the various real-time functions may be less than suggested by
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the units in which their value or argument is expressed. E.g. on most Unix
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systems, the clock "ticks" only 50 or 100 times a second, and on the Mac, times
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* On the other hand, the precision of :func:`time` and :func:`sleep` is better
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than their Unix equivalents: times are expressed as floating point numbers,