Display a decimal in scientific notation

Question

How can I display this   Decimal  40800000000 00000000000000   as  4 08E 10    I ve tried this    gt  gt  gt    E    Decimal  40800000000 00000000000000    4 080000E 10    But it has those extra 0 s

User · Answer

My decimals are too big for  E so I had to improvize   def format decimal x  prec 2       tup   x as tuple       digits   list tup digits  prec   1       sign    -  if tup sign else        dec      join str i  for i in digits 1        exp   x adjusted       return   sign  int   dec e exp   format sign sign  int digits 0   dec dec  exp exp    Here s an example usage    gt  gt  gt  n   decimal Decimal 4 3     12314  gt  gt  gt  print format decimal n  3 39e7800  gt  gt  gt  print   e    n inf

User · Answer

Here is the simplest one I could find   format 40800000000 00000000000000    2E     4 08E 10      E  is not case sensitive  You can also use   2e

User · Answer

Here s an example using the format   function    gt  gt  gt      2E   format Decimal  40800000000 00000000000000     4 08E 10    Instead of format  you can also use f-strings    gt  gt  gt  f  Decimal  40800000000 00000000000000    2E    4 08E 10     official documentation original format   proposal

User · Answer

def formatE decimal x  prec 2           Examples       gt  gt  gt  formatE decimal  0 1613965  10       1 6139650000E-01       gt  gt  gt  formatE decimal  0 1613965  5       1 61397E-01       gt  gt  gt  formatE decimal  0 9995  2       1 00E 00              xx decimal Decimal x  if type x   type     else x      tup   xx as tuple       xx xx quantize  decimal Decimal  1E 0   format len tup 1   tup 2 -prec-1    decimal ROUND HALF UP       tup   xx as tuple       exp   xx adjusted       sign    -  if tup sign else        dec      join str i  for i in tup 1  1 prec 1          if prec gt 0          return   sign  int   dec E exp  03d   format sign sign  int tup 1  0   dec dec  exp exp      elif prec  0          return   sign  int E exp  03d   format sign sign  int tup 1  0   exp exp      else          return None

User · Answer

See tables from Python string formatting to select the proper format layout  In your case it s   2E

User · Answer

This is a consolidated list of the  Simple  Answers  amp  Comments   PYTHON 3  from decimal import Decimal  x    40800000000 00000000000000    Converted to Float x   Decimal x                                              Dot Format  print   0  2E   format x                                                 Format print    2E    x                                             f  Format print f  x  2E                                              ALL Return  4 08E 10 print  f  x  2E           2E    x        0  2E   format x      True print type f  x  2E       type    2E    x     type   0  2E   format x      True                                           OR Without IMPORT s    NO IMPORT NEEDED FOR BASIC FLOATS y    40800000000 00000000000000  y   float y                                              Dot Format  print   0  2E   format y                                                 Format print    2E    y                                             f  Format print f  y  2E                                              ALL Return  4 08E 10 print  f  y  2E           2E    y        0  2E   format y      True print type f  y  2E       type    2E    y     type   0  2E   format y      True                                           Comparing                                          x   Decimal  40800000000 00000000000000   y   40800000000 0  type x     lt class  decimal Decimal  gt  type y     lt class  float  gt   x    y   True type x     type y    False  x   Decimal  40800000000 00000000000000   y   40800000000 0   So for Python 3  you can switch between any of the three for now     My Fav   print   0  2E   format y

User · Answer

To convert a Decimal to scientific notation without needing to specify the precision in the format string  and without including trailing zeros  I m currently using  def sci str dec       return          str len dec normalize   as tuple   digits  - 1     E    format dec   print  sci str  Decimal  123 456000            1 23456E 2   To keep any trailing zeros  just remove the normalize

User · Answer

This worked best for me   import decimal    2E    decimal Decimal  40800000000 00000000000000     4 08E 10

User · Answer

from decimal import Decimal     2E    Decimal  40800000000 00000000000000      returns  4 08E 10    In your  40800000000 00000000000000  there are many more significant zeros that have the same meaning as any other digit  That s why you have to tell explicitly where you want to stop   If you want to remove all trailing zeros automatically  you can try   def format e n       a     E    n     return a split  E   0  rstrip  0   rstrip         E    a split  E   1   format e Decimal  40800000000 00000000000000       4 08E 10   format e Decimal  40000000000 00000000000000       4E 10   format e Decimal  40812300000 00000000000000       4 08123E 10

User · Answer

I prefer Python 3 x way   cal   123 4567 print f result  cal  4E      4 indicates how many digits are shown shown in the floating part    cal   123 4567 totalDigitInFloatingPArt   4 print f result  cal   totalDigitInFloatingPArt E

User · Answer

No one mentioned the short form of the  format method   Needs at least Python 3 6  f  Decimal  40800000000 00000000000000    2E      I believe it s the same as Cees Timmerman  just a bit shorter

User · Answer

Given your number   x   Decimal  40800000000 00000000000000     Starting from Python 3        2e   format x    is the recommended way to do it   e means you want scientific notation  and  2 means you want 2 digits after the dot  So you will get x xxE  n

[python] Display a decimal in scientific notation

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