This is a backup of my idle-theme (Obsidian). ;-)
Place this file (config-highlight.def) in the path :\Python34\Lib\idlelib and replace the current file. (overwrite it)
Installation:
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Ensure IDLE is closed
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Open your .idlerc file, usually in your home directory
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Paste in the settings and save
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Open IDLE, Options -> Configure
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Under the Highlighting tab, Obsidian should now be a custom theme available in the dropdown list.
Not to become BLIND. Pyhton's Idle is too bright for daily use.
This was tested solely on Windows 7 64 bit using python3.4.x but it should work on other platforms as well.
This file came from this website.