Terry J. Reedy added the comment:
When python is started without running a file (Windows icon or command line),
'' is prepended to sys.path. When IDLE is started from 3.5 icon, '' is
prepended temporally after and spatially before '.../idlelib', so the latter,
to be removed, is sys.path[1] an
New submission from Terry J. Reedy:
Problem: Consider module idlelib.run. The following is correct.
C:\Users\Terry>python -c "import run"
Traceback (most recent call last):
File "", line 1, in
ImportError: No module named 'run'
But in IDLE started from icon or command line
>>> import run
>>
