How to get numbers after decimal point

Question

How do I get the numbers after a decimal point   For example  if I have 5 55  how do i get  55

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If you are using pandas   df  decimals     df  original number   mod 1

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Easier if the input is a string  we can use split   decimal   input  quot Input decimal number   quot    123 456    split 123 456 by dot     123    456   after coma   decimal split      1      because only index 1 is taken then  456  print after coma     456   if you want to make a number type print int after coma     456

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number 5 55 decimal  number-int number   decimal 1 round decimal 2  print decimal  print decimal 1    output  0 55

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I ve found that really large numbers with really large fractional parts can cause problems when using modulo 1 to get the fraction   import decimal   gt  gt  gt  d   decimal Context decimal MAX PREC  create decimal       143000000000000000000000000000000000000000000000000000000000000000000000000000 1231200000000000000002013210000000             gt  gt  gt  d   1 Traceback  most recent call last     File   lt stdin gt    line 1  in  lt module gt  decimal InvalidOperation    lt class  decimal DivisionImpossible  gt     I instead grabbed the integral part and subtracted it first to help simplify the rest of it    gt  gt  gt  d - d to integral   Decimal  0 1231200000000000000002013210

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similar to the accepted answer  even easier approach using strings would be  def number after decimal number1       number   str number1      if  e-  in number    scientific notation         number dec   format float number      df   len number split      1  split  e-   0   int number split  e-   1         elif     in number    quick check if it is decimal         number dec   number split      1      return number dec

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What about   a   1 234 b   a - int a  length   len str a    round b  length-2    Output  print b  0 23399999999999999 round b  length-2  0 234     Since the round is sent to a the length of the string of decimals   0 234    we can just minus 2 to not count the  0    and figure out the desired number of decimal points  This should work most times  unless you have lots of decimal places and the rounding error when calculating b interferes with the second parameter of round

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Using math module speed of this has to be tested from math import floor  def get decimal number          returns number - floor of number        return number-floor number    Example  n   765 126357123  get decimal n    0 12635712300004798

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import math orig   5 55 whole   math floor orig       whole   5 0 frac   orig - whole           frac   0 55

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Sometimes trailing zeros matter  In  4   def split float x                  split float into parts before and after the decimal                before  after   str x  split                  return int before    int after  10 if len after   1 else int after                      In  5   split float 105 10  Out 5    105  10   In  6   split float 105 01  Out 6    105  1   In  7   split float 105 12  Out 7    105  12

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See what I often do to obtain numbers after the decimal point in python    3   a 1 22 dec str a  split      dec  int dec 1

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Another example using modf  from math import modf number   1 0124584     0  decimal   1  integer result   modf number  print result 0     output   0124584 print result 1     output   1

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Use modf    gt  gt  gt  import math  gt  gt  gt  frac  whole   math modf 2 5   gt  gt  gt  frac 0 5  gt  gt  gt  whole 2 0

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Example   import math x   5 55 print  math floor x 100  100     This is will give you two numbers after the decimal point  55 from that example  If you need one number you reduce by 10 the above calculations or increase depending on how many numbers you want after the decimal

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def fractional part numerator  denominator       if denominator    0          return 0     else          return numerator   denominator - numerator    denominator  print fractional part 5  5     Should be 0 print fractional part 5  4     Should be 0 25 print fractional part 5  3     Should be 0 66    print fractional part 5  2     Should be 0 5 print fractional part 5  0     Should be 0 print fractional part 0  5     Should be 0

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Use floor and subtract the result from the original number    gt  gt  import math  gives you floor   gt  gt  t   5 55  Give a variable 5 55  gt  gt  x   math floor t   floor returns t rounded down to 5    gt  gt  z   t - x  z   5 55 - 5   0 55

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You may want to try this   your num   5 55 n   len str int your num    float  0    str your num  n      It will return 0 55

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def fractional part numerator  denominator         Operate with numerator and denominator to    keep just the fractional part of the quotient if  denominator    0        return 0   else         return  numerator  denominator - numerator    denominator       print fractional part 5  5     Should be 0 print fractional part 5  4     Should be 0 25 print fractional part 5  3     Should be 0 66    print fractional part 5  2     Should be 0 5 print fractional part 5  0     Should be 0 print fractional part 0  5     Should be 0

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What about   a   1 3927278749291 b   a - int a   b  gt  gt  0 39272787492910011   Or  using numpy   import numpy a   1 3927278749291 b   a - numpy fix a

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Float numbers are not stored in decimal  base10  format  Have a read through the python documentation on this to satisfy yourself why  Therefore  to get a base10 representation from a float is not advisable   Now there are tools which allow storage of numeric data in decimal format  Below is an example using the Decimal library   from decimal import    x   Decimal  0 341343214124443151466   str x  -2       66     True  y   0 341343214124443151466 str y  -2       66     False

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import math  x   1245342664 6 print   math floor x 1000  1000    100     It definitely worked

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This is only if you want toget the first decimal print int float input      10    10   Or you can try this num   float input    b   num - int num   c   b   10 print int c

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Another crazy solution is  without converting in a string    number   123 456 temp   1  while  number temp  10    0      temp   temp  10     print temp     print number  temp   temp  10 number   number temp number final   number temp print number final

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Try Modulo   5 55 1   0 54999999999999982

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This is a solution I tried   num   45 7234  whole  frac     int num   int str num   len str int num    1

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An easy approach for you   number dec   str number-int number   1

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You can use this  number   5 55 int str number  split      1

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Just using simple operator division     and floor division      you can easily get the fraction part of any given float    number   5 55  result    number 1  -  number  1   print result

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5 55   1   Keep in mind this won t help you with floating point rounding problems  I e   you may get   0 550000000001   Or otherwise a little off the 0 55 you are expecting

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gt  gt  gt  n 5 55  gt  gt  gt  if     in str n           print     str n  split      -1       55

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Another option would be to use the re module with re findall or re search   import re   def get decimcal n  float  - gt  float      return float re search r    d    str n   group 0     def get decimcal 2 n  float  - gt  float      return float re findall r    d    str n   0     def get int n  float  - gt  int      return int n    print get decimcal 5 55   print get decimcal 2 5 55   print get int 5 55     Output  0 55 0 55 5     If you wish to simplify modify explore the expression  it s been explained on the top right panel of regex101 com  If you d like  you can also watch in this link  how it would match against some sample inputs     Source  How to get rid of additional floating numbers in python subtraction

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Using the decimal module from the standard library  you can retain the original precision and avoid floating point rounding issues    gt  gt  gt  from decimal import Decimal  gt  gt  gt  Decimal  4 20     1 Decimal  0 20     As kindall notes in the comments  you ll have to convert native floats to strings first

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A solution is using modulo and rounding   import math  num   math fabs float 5 55   rem   num   1  rnd by     len str num   - len str int num    - 1  print str round rem rnd by      Your output will be 0 55

[python] How to get numbers after decimal point?

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