IDLE has suddenly become FAWLTY - so should I be hitting it with a big stick, or what?

[pypythotho]

In Command Prompt, 'python -m idlelib' helped me to dicover the problem source. An explicit message told that an indentation was insconsistant in the file ntpath.py I modified previously with notepad++. I replaced a tab by 4 spaces and IDLE run again like a charm.