CW lecture generator based on Osvald's LY2BJ training method

lectures.py

#!/usr/bin/env python3
import sys
import random
import string
from urllib.parse import quote

letters = 'eistmohanrkuwdgvflpjbxcyzq?/.,'
numbers = '1234567890'
lectures = [3, 3, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2]
out = 'vvv   '

level = 2

count = 50
speed = 20
effective = 5
tone = 600

letter_set = letters[:sum(lectures[:level])]
pos = 0
while pos < count:
    out += letter_set[random.randrange(len(letter_set))]
    pos += 1
    if (pos %  5) == 0: out += ' '*3
    if (pos % 25) == 0: out += ' '*5

print('Lesson content:\n' + '-' * len(out.strip()))
sys.stdout.write(out)
print('\n' + '-' * len(out.strip()))

print('Link to MP3 at LCWO.net:\n')
print('\033[4m' + 'https://cgi2.lcwo.net/cgi-bin/cw.mp3?s=' + \
    str(speed) + '&e=' + \
    str(effective) + '&f=' + \
    str(tone) + '&t=' + \
    quote(out) + '\033[0m')