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The lesson here is that floating point numbers are not exact and that you should never do a straight comparison with them. Instead check to see if they are within some small tolerance of each other. In python that is done with
math.isclose(0.1 + 0.2, 0.3)
.Please don't try to approximate. Use the decimal module to represent numbers and everything will work as expected and it has a ton of other features you didn't know you needed.
https://docs.python.org/3/library/decimal.html#module-decimal