What are some free IDE for Python on Windows?

I would go with http://www.eclipse.org/ + http://pydev.org/. Interpreter, I don't know. PyDev works with Python, Jython and IronPython. I haven't used this combo in Windows, but in Linux it works very well. And since Eclipse should work more or less the same in Windows I assume it works well there, too.

Eclipse + PyDev works on Windows as well. But I haven't tried out Jython and IronPython. Also  pyscripter " https://code.google.com/p/pyscripter/ "   is pretty good.

PyCharm has a Community Edition which is free. I have used PyScripter few times on Windows and liked it (its packaged with Portable Python). I personally use Vim and am happy with it. May  not be smooth start, but you may end up loving it. These two plugins for Vim should be helpful. Syntastic [https://github.com/scrooloose/syntastic] for syntax checking Jedi [https://github.com/davidhalter/jedi gives auto-completion, function hints and documentation which can be bit slow and annoying sometimes, but mostly ok. I usually write lot of small Python programs, and like to run it frequently and instantly similar to "Run" button/common in most IDE's. On *nix environment I found this small shell script useful - http://vim.wikia.com/wiki/Send_buffer_to_interpreter_in_a_new_xterm " Use these binding with above shell script " Run python script shortcut au! BufRead,BufWrite,BufWritePost,BufNewFile *.py au BufEnter *.py map <leader>p :w !~/local/bin/viminterpreter python2& <CR><CR> au! BufLeave *.py unmap <leader>p

I am a python hobyist so I don't want to spend money to buy IDE. There are several good IDEs out there. Pyscripter, EricIDE, Eclipse+pydev, KomodoEdit. You can try them all and choose which one you prefer. I feel comfortable enough with KomodoEdit.