The best replacement for python 3.3 is ruby 2.0.

The best alternatives to python 3.3 are rated as following:
★★★★★  ruby 2.0

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Speaking about python 3.3, one probably shouldn't forget about pygame.

Other search terms related to python 3.3 and their ratings are:
★★★★★ pygame
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python 3.3
ruby 2.0