[issue25488] IDLE: Remove '', user_dir, and idlelib from sys.path when added

[Terry J. Reedy]

Terry J. Reedy added the comment:

In private email, eryk sun reports  "/usr/bin/idle3 instead prepends 3 directories: ['', current_directory_absolute, '/usr/bin']. If I use the -r option to run a script, it instead prepends script_directory_relative, '', '/usr/bin']. I think these should be [''] and [script_directory_absolute], respectively."

Windows does not have idle3.  None of the directories above are needed to run IDLE and I believe any could contain masking files.

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<http://bugs.python.org/issue25488>
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