Problem: Unable to open Python IDLE or edit script tools from ArcToolbox
When right-clicking a script tool and selecting "Edit" or attempting to open Python IDLE from the Windows Start menu, nothing happens.
This is a known issue with Python 2.5.1 on Windows.
Solution or Workaround
The .idlerc folder in the current user's profile cannot have the "Hidden" option activated.
In Windows Explorer, navigate to the user's profile directory.
To see hidden files in XP:
1. Under Tools menu in Windows Explorer, click Folder Options. 2. Click View. 3. Under Hidden files and folders, click Show hidden files and folders.
To see hidden files in Vista/Win7:
1. Open Folder Options by clicking Start > Control Panel > Appearance and Personalization > Folder Options. 2. Click View. 3. Under Advanced settings, click Show hidden files and folders, and then click OK.
Right-click the ".idlerc" folder and select Properties. Uncheck the "Hidden" attribute if it's active and apply the new settings.
Test the change by editing a script tool or opening Python IDLE again.