RSA_numbers_factored.py

Introduction
- Python code formatting and linting
- Makefile
RSA_numbers_factored.py documentation
Non-standard Python environments
- MicroPython
- Android
Functionality validation:
- Python, browser and nodejs demos
- Python snapshot
Multiple precision integer performance across languages

Introduction

Associated forum thread:
https://forums.raspberrypi.com/viewtopic.php?t=343468

Continuation of RSA_numbers_factored.py gist (now in ./RSA_numbers_factored.py). Python code changes get manually transpiled to ../RSA_numbers_factored.js for use in nodejs and HTML demos, find details here (with added JavaScript implementation of sympy functions gcd and isprime, and functions from itertools).

Python code formatting and linting

With v1.10 this repo is formatted with Python code formatter black, and pylinted.
Here shown for demo RSA_svg.py to create SVG from a RSA number:

Different to OpenSSL random art, the generated image exposes RSA number factor p (1-bits = shown rows) and factor q (1-bits = shown columns) with "and" function:

    $ python RSA_svg.py 250 > 250.svg
    $ convert 250.svg 250.svg.png 
    $ file 250.svg.png 
    250.svg.png: PNG image data, 414 x 415, 2-bit colormap, non-interlaced
    $

Makefile

Makefile targets:

    $ make
    targets: doc|doc_diff|pylint|black|validate|clean
    $

doc: runs lazydocs to create new doc, with some sed replacements
doc_diff: updates doc, and shows reduced version of git diff for doc
pylint: runs pylint, allows long lines with 92+ continuous digits, ignores no-self-use and invalid-name warnings
black: runs "black" Python formatter, followed from make validate
validate: compares validation run output against file "validate.good"
clean: remove doc and temporary file