How can we control the rounding of our equation?

FAQ Python FAQ
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#21 
    0.20
  + 0.69
  -------
    0.89

    0.53
  x 0.65
  ------
     265
    3180
  ------
  0.3445

The number of decimal places is derived from the arithmetic.

#22

Hi mtf. Thanks for your response. What happens if, say, I want the first equation to print(one_decimal_point) instead of two? …

two_decimal_points = Decimal(‘0.2’) + Decimal(‘0.69’)
… somehow get to an output of …
→ only 0.9 …?

#23

I see your example and it makes sense … but if what you say is true, then why in the lesson for this concept does the example produce a long string of numbers instead of just two decimals like what I wrote in green?

Decimals
Decimals792×350 24.3 KB

#24

Is it that by adding (in front of the number) the word Decimal, we’re telling the computer to “Hey, this number has two decimals so stick with a two decimal result?” Also, the lesson says that Decimal is a data type … which came from inside the decimal library/module right? Data type. Exactly like how strings and boolean are data types too right? So Decimal is NOT a function?

#25

It will be helpful to have the documentation on hand when working with this module, at least until it is committed to memory.

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#26

Thank you for this reference. I will study it!

1 Like