Problems with simple float values

Asked Oct 12 '21 at 15:33

Active Oct 12 '21 at 15:48

Viewed 21 times

We have these three values:
x = 7.68
y = 7.775
z = 7.87

It happens that y-x = z-y = 0.095, but Python insists on assigning the following values:
y-x = 0.09500000000000064
z-y = 0.094999999999999975

It is an insignificant difference, but enough to return wrong results, for example:
y-x == z-y returns False, which is not true, the comparison should return True (0.095 == 0.095)

The fact is that those types of results are throwing me a comparison routine and the function returns me wrong results for it. How could you avoid this, if possible without using "external" typo sympy modules?

edited Oct 12 '21 at 15:48

asked Oct 12 '21 at 15:33

Lvdvig

Have you tried using the same number of digits for each number? – FLAK-ZOSO Oct 12 '21 at 15:40
You should use the `Decimal` object in this particular case I believe. – Jarvis Oct 12 '21 at 15:50
Number of digits used as shown in x, y, z values. – Lvdvig Oct 12 '21 at 18:09
Tested with Decimal and don't works, I get strange values. – Lvdvig Oct 12 '21 at 18:10

Problems with simple float values

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