increasing float-point numbers accuracy [closed]

Question

How to switch default floating point numbers accuracy to another, maybe custom? I need this, cause I do some calculations and I see that I should increase default float point accuracy.

Answer 1

I've recently had to deal with this problem and the mpmath was perfect. It is pure python, under a BSD license.

Mpmath is a pure-Python library for multiprecision floating-point arithmetic. It provides an extensive set of transcendental functions, unlimited exponent sizes, complex numbers, interval arithmetic, numerical integration and differentiation, root-finding, linear algebra, and much more. Almost any calculation can be performed just as well at 10-digit or 1000-digit precision, and in many cases mpmath implements asymptotically fast algorithms that scale well for extremely high precision work

It is not too much slower, and it can leverage the gmpy library if installed (a C-coded Python extension modules that support fast multiple-precision arithmetic).

Answer 2

If you want greater accuracy I would instead advise you to use the bigfloat package (since this is what it's made for). Alternatively, you can also look into the Decimal class.