hello.py

from itertools import chain
# pragma  allow the transcrypt to jump code between  "skip"  and  "noskip"
# we use interfaces to have suggestion and autocomplete  by visul studio code while editing code
# but interfaaces not affect our output hello.js
#__pragma__ ('skip')
from interfaces.document import document
from interfaces.math import Math
#__pragma__ ('noskip')

#endjump
class SolarSystem:
        planets = [list(chain(planet, (index + 1,))) for index, planet in enumerate((
            ('Mercury', 'hot', 2240),
            ('Venus', 'sulphurous', 6052),
            ('Earth', 'fertile', 6378),
            ('Mars', 'reddish', 3397),
            ('Jupiter', 'stormy', 71492),
            ('Saturn', 'ringed', 60268),
            ('Uranus', 'cold', 25559),
            ('Neptune', 'very cold', 24766)
        ))]
        
        lines = (
            '{} is a {} planet',
            'The radius of {} is {} km',
            '{} is planet nr. {} counting from the sun'
        )
        def __init__(self):
            self.lineIndex = 0

        def greet(self):
            self.planet = self.planets[int(Math.random() * len(self.planets))]
        
            document.getElementById(  'greet') .innerHTML = 'Hello {}'.format(self.planet[0])
            self.explain()

        def explain(self):
            document.getElementById('explain').innerHTML = (
                self.lines[self.lineIndex] .format(
                    self.planet[0], self.planet[self.lineIndex + 1])
            )
            self.lineIndex = (self.lineIndex + 1) % 3

solarSystem = SolarSystem()