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string representation of a rational number in any base

Project description

Purpose

A small library for generating a human readable string value from a number with an arbitrary base. The number is represented by five elements:

  • a sign

    -1, 1, or 0 as appropriate

  • an integer part

    a list of non-negative ints, where each element is less than the base value

  • a non repeating fractional part

    a list of non-negative ints, where each element is less than the base value

  • a repeating fractional part

    a list of non-negative ints, where each element is less than the base value

  • a base

    the base of the number, must be an integer greater than 1.

Usage

>>> from justbases_string import *
>>> xformer = String(DisplayConfig(), 2)
>>> xformer.xform(-1, [1, 0, 1], [], [1, 0], 0)
'-101.(10)_2'
>>> xformer.xform(0, [], [0, 0], [], 0)
'0_2'

An exception is raised if the parts of the number do not conform to the necessary constraints:

>>> xformer.xform(1, [2], [0, 0], [], 0)
Traceback (most recent call last):
...

>>> xformer.xform(1, [-1], [0, 0], [], 0)
Traceback (most recent call last):
...

There are numerous options for configuring the string result:

>>> digits_config = DigitsConfig(use_letters=False)
>>> xformer = String(DisplayConfig(digits_config=digits_config), 1024)
>>> xformer.xform(1, [2], [2, 4, 256], [], 0)
'2.2~4~256_1024'

>>> digits_config = DigitsConfig(use_caps=True)
>>> xformer = String(DisplayConfig(digits_config=digits_config), 16)
>>> xformer.xform(1, [], [0, 13], [], 0)
'0.0D_16'

The final argument is the relation of the value being displayed to the value it represents:

>>> xformer.xform(1, [2], [2, 4, 256], [], Fraction(1, 3))
'< 2.2~4~256_1024'

Project details


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This version

0.1

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