Roman Numerals with Python

Sat, 14 Feb 2026 00:00:00 +0000

Roman Numerals Link to heading

Imagine writing Python code like this:

import roman

print(roman.X) # 10
print(roman.IV) # 4
print(roman.XLII) # 42
print(roman.MCMXC) # 1990

Simply elegant, isn’t it? No functions, no explicit conversions, just… roman numerals being roman numerals. It is as if the language naturally understood this thousand-year-old system.

Internal DSLs and the Magic of `getattr` Link to heading

A DSL (Domain-Specific Language) is basically a language created for a specific purpose. There are external ones (with their own syntax) and internal ones (which piggyback on the syntax of the language you already use). What we are going to create here is an internal DSL.

Metaprogramming on cassiobotaro

Roman Numerals with Python

Roman Numerals Link to heading

Internal DSLs and the Magic of __getattr__ Link to heading

Internal DSLs and the Magic of `getattr` Link to heading