'python -m idlelib' gave me information about a file, ntpath.py, that I've
edited before with notepad++. This file has been rewritten with a tab instead
of 4 paces. The command suggested by Terry displayed an explicit message about
wrong indentation. This error fixed, IDLE run again like a charm
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.
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