d2718nis/codewars-roman-numerals-decoder

Codewars 4 Kyu Kata for transforming Roman numerals to the numeric decimal integer.

Roman Numerals Decoder

Solution for the codewars challenge.

• Task description: https://www.codewars.com/kata/roman-numerals-decoder/python

The Task

Create a function that takes a Roman numeral as its argument and returns its value as a numeric decimal integer. You don't need to validate the form of the Roman numeral.

Modern Roman numerals are written by expressing each decimal digit of the number to be encoded separately, starting with the leftmost digit and skipping any 0s. So 1990 is rendered "MCMXC" (1000 = M, 900 = CM, 90 = XC) and 2008 is rendered "MMVIII" (2000 = MM, 8 = VIII). The Roman numeral for 1666, "MDCLXVI", uses each letter in descending order.

Example

solution('XXI') # should return 21

Running Tests

Tests are located in the tests directory. To run Roman to decimal integer converter related tests use python -m unittest tests.test_roman_solution

Authors

• Denis Z. — Initial work — d2718nis

See also the list of contributors who participated in this project.

Acknowledgments

• Wikipedia: Roman numerals — the numeric system represented originated in ancient Rome
• Wikipedia: Arabic numerals — ten digits: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, based on the Hindu–Arabic numeral system