Uses espeak to ask user about simple arithmetic calculations and answers each question by itself after some time. Default language is German. – It has been reported to me that, making a game with it, can be great fun on parties. ;)

Mental arithmetic trainer

#!/usr/bin/env python

import random as ra
import os, time

def main(language):
  ra.seed()
  ops = ("+", "-", "*", "/")
  equals = ("=")
  comma = "point"
  if (language == "german"):
    ops = ("plus", "minus", "mal", "durch")
    equals = ("macht", "ergibt", "ist gleich", "entspricht")
    comma = (",")
  while(True):
    op = ra.randint(0, len(ops)-1)
    a = ra.randint(1, 10+90*(op<2))
    b = ra.randint(1, 10+90*(op<2))
    os.system("espeak -v %s \"%i %s %i\"" % (language, a, ops[op], b)) > 0
    time.sleep(7)
    res = a
    if op == 0:
      res += b
    elif op == 1:
      res -= b
    elif op == 2:
      res *= b
    else:
      if res%b == 0:
        res /= b
      else:
        res = round(res*1./b,2)
    res = str(res).replace(".", comma)
    os.system("espeak -v %s \"%i %s %i %s %s\"" % (language, a, ops[op], b, equals[ra.randint(0,len(equals)-1)], res)) > 0

main("german")