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Python Rounding Bankers Rounding round mathceil mathfloor mathtrunc Tutorial
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http://youtube.com/watch?v=xBAkyXZXHqo
In depth tutorial of rounding with Python, geared to beginners. Discussion of the built-in round function, as well as getting ceilings, floors, and truncating numbers using Python's math module. Includes discussion of why numbers ending in .5 sometimes rounds up and sometimes rounds down (i.e. Banker's Rounding, aka Dutch Rounding or Gaussian rounding), and a couple of different ways to get numbers ending in .5 to always round up instead. Time stamps are below. • For more information on Python's round() function, visit: https://docs.python.org/3/library/fun.... • For more information on Python's math module, visit: https://docs.python.org/3/library/mat.... • Please note that due to inherent limitations with float values, there may be unexpected results with rounding. For more information on these limitations, visit: https://docs.python.org/3/tutorial/fl.... • This tutorial uses Python 3.8.3. To download the current version of Python, visit: https://www.python.org/. It also uses PyCharm (Community Edition). To download PyCharm, visit: https://www.jetbrains.com/pycharm/. • round() - 0:22 • Why do numbers ending in .5 sometimes round down and sometimes round up? (Banker's Rounding (rounding to the nearest even result)) - 1:34 • round() to specified number of digits - 6:25 • round() to None number of digits - 7:37 • round() using expressions inside the parenthesis - 9:32 • Can you round infinity or not a number ? - 13:05 • math.ceil() - 14:10 • Taking ceiling of negative number - 15:59 • Using math.ceil() to always round numbers ending in .5 up - 17:48 (Not in video - but note that you could do the same thing with math.floor() to always round numbers ending in .5 down if you were so inclined). • math.floor() - 19:10 • Taking floor of negative number - 20:49 (first time inadvertently uses math.ceil, is corrected at 21:23) • math.trunc() - 22:08 • Can you truncate infinity or not a number ? - 23:57 • Using math.trunc() to round (and always round numbers ending in .5 up) through math.trunc(n +.5) - 24:39 • Truncating negative number when rounding with truncate (e.g. math.trunc(-3.5 + .5)) - 28:11
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