How can I format a decimal to always show 2 decimal places

Question

I want to display   49 as 49 00  and   54 9 as 54 90  Regardless of the length of the decimal or whether there are are any decimal places  I would like to display a Decimal with 2 decimal places  and I d like to do it in an efficient way  The purpose is to display money values   eg  4898489 00

User · Answer

In python 3  a way of doing this would be      2f   format number

User · Answer

format is a more readable way to handle variable formatting        prec f   format 26 034  prec 2

User · Answer

if you have multiple parameters you can use   print  some string  0  2f   amp   1  2f   format 1 1234 2 345     gt  gt  gt  some string 1 12  amp  2 35

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The OP always wants two decimal places displayed  so explicitly calling a formatting function  as all the other answers have done  is not good enough  As others have already pointed out  Decimal works well for currency  But Decimal shows all the decimal places  So  override its display formatter  class D decimal Decimal       def   str   self           return f  self  2f      Usage   gt  gt  gt  cash   D 300000 991   gt  gt  gt  print cash  300000 99  Simple

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This is the same solution as you have probably seen already  but by doing it this way it s more clearer   gt  gt  gt  num   3 141592654  gt  gt  gt  print f quot Number   num  2f  quot

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what about   print round 20 2564567   2      gt  gt  gt  gt  gt  gt  gt         20 25   print round 20 2564567   4      gt  gt  gt  gt  gt  gt  gt         20 2564

User · Answer

You can use the string formatting operator as so   num   49 x      2f    num    x is now the string  49 00    I m not sure what you mean by  efficient  -- this is almost certainly not the bottleneck of your application   If your program is running slowly  profile it first to find the hot spots  and then optimize those

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gt  gt  gt  print     2f   format 1 123456  1 12   You can change 2 in 2f to any number of decimal points you want to show   EDIT   From Python3 6  this translates to    gt  gt  gt  print f  1 1234  2f    1 12

User · Answer

I suppose you re probably using the Decimal   objects from the decimal module   If you need exactly two digits of precision beyond the decimal point with arbitrarily large numbers  you definitely should be  and that s what your question s title suggests     If so  the Decimal FAQ section of the docs has a question answer pair which may be useful for you   Q  In a fixed-point application with two decimal places  some inputs have many places and need to be rounded  Others are not supposed to have excess digits and need to be validated  What methods should be used  A  The quantize   method rounds to a fixed number of decimal places  If the Inexact trap is set  it is also useful for validation    gt  gt  gt  TWOPLACES   Decimal 10     -2         same as Decimal  0 01    gt  gt  gt    Round to two places  gt  gt  gt  Decimal  3 214   quantize TWOPLACES  Decimal  3 21    gt  gt  gt    Validate that a number does not exceed two places  gt  gt  gt  Decimal  3 21   quantize TWOPLACES  context Context traps  Inexact    Decimal  3 21    gt  gt  gt  Decimal  3 214   quantize TWOPLACES  context Context traps  Inexact    Traceback  most recent call last          Inexact  None  The next question reads  Q  Once I have valid two place inputs  how do I maintain that invariant throughout an application   If you need the answer to that  along with lots of other useful information   see the aforementioned section of the docs  Also  if you keep your Decimals with two digits of precision beyond the decimal point  meaning as much precision as is necessary to keep all digits to the left of the decimal point and two to the right of it and no more      then converting them to strings with str will work fine  str Decimal  10      - gt   10  str Decimal  10 00      - gt   10 00  str Decimal  10 000      - gt   10 000

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The String Formatting Operations section of the Python documentation contains the answer you re looking for   In short     0 2f     num     Some examples    gt  gt  gt    0 2f    10  10 00   gt  gt  gt    0 2f    1000  1000 00   gt  gt  gt    0 2f    10 1  10 10   gt  gt  gt    0 2f    10 120  10 12   gt  gt  gt    0 2f    10 126  10 13

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If you re using this for currency  and also want the value to be seperated by   s you can use         f2  format currency value    e g    currency value   1234 50        f2  format currency value  -- gt    1 234 50  Here is a bit of code I wrote some time ago   print   gt  At the end of year      year string      total paid is  t      2f   format total paid     gt  At the end of year   1  total paid is           43 806 36  gt  At the end of year   2  total paid is           87 612 72  gt  At the end of year   3  total paid is           131 419 08  gt  At the end of year   4  total paid is           175 225 44  gt  At the end of year   5  total paid is           219 031 80    lt -- Note  80 and not  8  gt  At the end of year   6  total paid is           262 838 16  gt  At the end of year   7  total paid is           306 644 52  gt  At the end of year   8  total paid is           350 450 88  gt  At the end of year   9  total paid is           394 257 24  gt  At the end of year  10  total paid is           438 063 60    lt -- Note  60 and not  6  gt  At the end of year  11  total paid is           481 869 96  gt  At the end of year  12  total paid is           525 676 32  gt  At the end of year  13  total paid is           569 482 68  gt  At the end of year  14  total paid is           613 289 04  gt  At the end of year  15  total paid is           657 095 40    lt -- Note  40 and not  4    gt  At the end of year  16  total paid is           700 901 76  gt  At the end of year  17  total paid is           744 708 12  gt  At the end of year  18  total paid is           788 514 48  gt  At the end of year  19  total paid is           832 320 84  gt  At the end of year  20  total paid is           876 127 20    lt -- Note  20 and not  2

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The Easiest way example to show you how to do that is    Code     gt  gt  gt  points   19 5   gt  gt  gt  total   22   gt  gt  gt  Correct answers     2    format points total     Output   Correct answers  88 64

User · Answer

You should use the new format specifications to define how your value should be represented   gt  gt  gt  from math import pi    pi   3 141592653589793  gt  gt  gt    0  2f   format pi   3 14   The documentation can be a bit obtuse at times  so I recommend the following  easier readable references   the Python String Format Cookbook  shows examples of the new-style  format   string formatting pyformat info  compares the old-style   string formatting with the new-style  format   string formatting  Python 3 6 introduced literal string interpolation  also known as f-strings  so now you can write the above even more succinct as   gt  gt  gt  f  pi  2f    3 14

[python] How can I format a decimal to always show 2 decimal places?

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