How to round a floating point number up to certain decimal place in Python?

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Suppose I am having 8.8333333333333339 and I want to convert it to 8.84, how can I accomplish this in python? round(8.8333333333333339, 2) gives 8.83 and not 8.84. I am new to python or programming in general.

I don't want to print it as a string, the result will be further used. For more information on the problem please check Tim Wilson's Python Programming Tips: Loan and payment calculator.

Oct 8, 2018 in Python by aryya
• 7,400 points

1 answer to this question.

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This is normal (and has nothing to do with Python) because 8.83 cannot be represented exactly as a binary float, just as 1/3 cannot be represented exactly in decimal (0.333333... ad infinitum).

If you want to ensure absolute precision, you need the decimal module:

>>> import decimal
>>> a = decimal.Decimal("8.833333333339")
>>> print(round(a,2))
answered Oct 8, 2018 by charlie_brown
• 7,780 points

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