For python you can try : http://www.pythonchallenge.com/ http://www.pythonchallenge.com/ (purely fun), http://www.spoj.pl/ http://www.spoj.pl/ (algorithmic), ht

For python you can try : http://www.pythonchallenge.com/ http://www.pythonchallenge.com/ (purely fun), http://www.spoj.pl/ http://www.spoj.pl/ (algorithmic), http://www.codechef.com/ http://www.codechef.com/ (competitive) and of course there is project euler (mathematically oriented)