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I have installed both python3.3 and python2.6. I have set python3.3 to default by creating an alias named "python" in usr/bin and another one for python2.6 named "python2.6". Now if I type in the terminal "python" python3.3 will be open but if I type "python2.6" I get "cannot execute binary file". I can launch the binary directly but not through the alias. I have checked the permissions and are the same for both binaries and aliases so I don't know what to do. Can someone help me?

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    Did you create aliases (in Finder) or symbolic links (in Terminal)? Can you execute the python2.6 binary in its installation directory directly? – nohillside Feb 3 '13 at 16:32
  • Aliases using finder and yes, I can run python 2.6 from the original folder without problems. – Rnhmjoj Feb 3 '13 at 16:40
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    I would recommend using symbolic links for this instead of aliases – nohillside Feb 3 '13 at 16:48
  • I created a link using "ln" and it's working. Thank you. – Rnhmjoj Feb 3 '13 at 17:02
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Instead of using Finder aliases, use Terminal to create symbolic links (see man ls for details):

ln -s /path/to/python3.3/binary /usr/local/bin/python
ln -s /path/to/python2.6/binary /usr/local/bin/python2.6

It's usually not a good idea to mess with /usr/bin content (will be wiped out with the next upgrade). Use /usr/local/bin instead and make sure it comes before /usr/bin in $PATH.

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