Rounding to two decimal places in Python 2 7

Question

Using Python 2 7 how do I round my numbers to two decimal places rather than the 10 or so it gives   print  financial return of outcome 1        str out1

User · Answer

print  financial return of outcome 1      2f     out1

User · Answer

When we use the round   function  it will not give correct values   you can check it using  round  2 735  and round 2 725   please use   import math num   input  Enter a number   print math ceil num 100  100

User · Answer

A rather simple workaround is to convert the float into string first  the select the substring of the first  four numbers  finally convert the substring back to float  For example    gt  gt  gt  out1   1 2345  gt  gt  gt  out1   float str out1  0 4    gt  gt  gt  out1   May not be super efficient but simple and works

User · Answer

Since you re talking about financial figures  you DO NOT WANT to use floating-point arithmetic  You re better off using Decimal    gt  gt  gt  from decimal import Decimal  gt  gt  gt  Decimal  33 505   Decimal  33 505     Text output formatting with new-style format    defaults to half-even rounding     gt  gt  gt  print  financial return of outcome 1      2f   format Decimal  33 505     financial return of outcome 1   33 50  gt  gt  gt  print  financial return of outcome 1      2f   format Decimal  33 515     financial return of outcome 1   33 52   See the differences in rounding due to floating-point imprecision    gt  gt  gt  round 33 505  2  33 51  gt  gt  gt  round Decimal  33 505    2     This converts back to float  wrong  33 51  gt  gt  gt  Decimal 33 505     Don t init Decimal from floating-point Decimal  33 50500000000000255795384873636066913604736328125     Proper way to round financial values    gt  gt  gt  Decimal  33 505   quantize Decimal  0 01       Half-even rounding by default Decimal  33 50     It is also common to have other types of rounding in different transactions    gt  gt  gt  import decimal  gt  gt  gt  Decimal  33 505   quantize Decimal  0 01    decimal ROUND HALF DOWN  Decimal  33 50    gt  gt  gt  Decimal  33 505   quantize Decimal  0 01    decimal ROUND HALF UP  Decimal  33 51     Remember that if you re simulating return outcome  you possibly will have to round at each interest period  since you can t pay receive cent fractions  nor receive interest over cent fractions  For simulations it s pretty common to just use floating-point due to inherent uncertainties  but if doing so  always remember that the error is there  As such  even fixed-interest investments might differ a bit in returns because of this

User · Answer

When working with pennies integers  You will run into a problem with 115  as in  1 15  and other numbers   I had a function that would convert an Integer to a Float       return float 115   0 01    That worked most of the time but sometimes it would return something like 1 1500000000000001   So I changed my function to return like this         return float format 115   0 01    2f      and that will return 1 15  Not  1 15  or 1 1500000000000001  returns a float  not a string   I m mostly posting this so I can remember what I did in this scenario since this is the first result in google

User · Answer

Use the built-in function round      gt  gt  gt  round 1 2345 2  1 23  gt  gt  gt  round 1 5145 2  1 51  gt  gt  gt  round 1 679 2  1 68   Or built-in function format      gt  gt  gt  format 1 2345    2f    1 23   gt  gt  gt  format 1 679    2f    1 68    Or new style string formatting    gt  gt  gt      2f   format 1 2345   1 23  gt  gt  gt      2f   format 1 679   1 68    Or old style string formatting    gt  gt  gt     2f     1 679   1 68    help on round    gt  gt  gt  print round   doc   round number   ndigits   - gt  floating point number  Round a number to a given precision in decimal digits  default 0 digits   This always returns a floating point number   Precision may be negative

User · Answer

Rounding up to the next 0 05  I would do this way   def roundup x       return round int math ceil x   0 05     0 05 2

User · Answer

The best  I think  is to use the format   function    gt  gt  gt  print  financial return of outcome 1         format str out1     2f       Should print  financial return of outcome 1     752 60   But I have to say  don t use round or format when working with financial values

User · Answer

You can use str format    too    gt  gt  gt  print  financial return of outcome 1      2f   format 1 23456  financial return of outcome 1   1 23

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