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

[Terry J. Reedy]

Terry J. Reedy added the comment:

sys.path for 3.6.0b1 on Win 10.
Start python from icon (start menu), console (py -3.6) or Explorer (click on python.exe)
'',
'C:\\Programs\\Python36\\python36.zip',
'C:\\Programs\\Python36\\DLLs',
'C:\\Programs\\Python36\\lib',
'C:\\Programs\\Python36',
'C:\\Programs\\Python36\\lib\\site-packages',

Start Python from Explorer by double-clicking *.py file or context menu 'Open': replace '' with
'C:/user/Terry/lib'  # directory containing file.

Running 'import sys; sys.path' (in user process) from IDLE Shell adds the following after ''.
Start IDLE from icon:
'C:\\Programs\\Python36\\Lib\\idlelib',
Start IDLE in console with py -3.6 -m idlelib:
'F:\\Python\\dev'  # the CWD of the console
Start IDLE in console with py -3.6 -m idlelib.idle:
'C:\\Programs\\Python36\\lib',  # duplicate added by idle.py
'F:\\Python\\dev'  # the CWD of the console
Start IDLE from Python with 'import idlelib.idle'
'C:\\Programs\\Python36\\lib',  # duplicate added by idle.py
'C:\\Programs\\Python36'  # the CWD of the running Python (dup)

Currently, idle.py inserts the directory containing idlelib into sys.path.  This is a duplicate unless running idlelib in a non-stanard location.  Check first.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25488>
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