x.py

import re
from random import randint, choice

f = open('algebra.html', 'r')
g = open('algebra2.html', 'w')

updated = 0
sumSoFar = 0.0

modes = ['low', 'avg', 'high']
mode = choice(modes)

for line in f:

    newLine = line
    while 'td class="s11"><' in newLine:

        if mode == 'low':
            a, b = 0, 4
        elif mode == 'avg':
            a, b = 3, 7
        else:
            a, b = 6, 10


        points = randint(a, b) / 10

        sumSoFar += points
        updated += 1
        if updated % 5 == 0:
            mode = choice(modes)

            sumSoFar -= points # go back one addition
            points = sumSoFar
            sumSoFar = 0.0


        newLine = newLine.replace('<td class="s11"><', '<td class="s11">%.1f<' % points, 1)

    g.write("%s\n" % newLine)

f.close()
g.close()