Double precision floating values in Python

Question

Are there data types with better precision than float

User · Accepted Answer

Unlike hardware based binary floating point, the decimal module has a user alterable precision (defaulting to 28 places) which can be as large as needed for a given problem.

If you are pressed by performance issuses, have a look at GMPY

User · Answer

Here is my solution  I first create random numbers with random uniform  format them in to string with double precision and then convert them back to float  You can adjust the precision by changing   2f  to   3f  etc    import random from decimal import Decimal  GndSpeedHigh   float format Decimal random uniform 5  25      2f    GndSpeedLow   float format Decimal random uniform 2  GndSpeedHigh      2f    GndSpeedMean   float Decimal format GndSpeedHigh   GndSpeedLow    2    2f     print GndSpeedMean

User · Answer

Python s built-in float type has double precision  it s a C double in CPython  a Java double in Jython   If you need more precision  get NumPy and use its numpy float128

User · Answer

May be you need Decimal   gt  gt  gt  from decimal import Decimal      gt  gt  gt  Decimal 2 675  Decimal  2 67499999999999982236431605997495353221893310546875     Floating Point Arithmetic

User · Answer

For some applications you can use Fraction instead of floating-point numbers    gt  gt  gt  from fractions import Fraction  gt  gt  gt  Fraction 1  3  54  Fraction 1  58149737003040059690390169     For other applications  there s decimal  as suggested out by the other responses

[python] Double precision floating values in Python?

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