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From: Terry Reedy <tjreedy@udel.edu>
Newsgroups: comp.lang.python
Subject: Re: unable to open IDLE for Python3.50rc1 on windows10 64bit AMD
Date: Thu, 24 Dec 2015 17:45:38 -0500
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Xref: csiph.com comp.lang.python:100842

On 12/24/2015 9:59 AM, eryk sun wrote:
> On Thu, Dec 24, 2015 at 5:06 AM, Nicky Mac <nmcelwaine@gmail.com> wrote:
>>
>> not sure what you mean by "my profile".
>> following your suggestion, looks normal:
>
> I meant your profile directory, "C:\Users\Nick". But printing the
> package path showed the problem is in your Python 3 installation
> itself.
>
>> C:\Users\Nick> python -c "import importlib;
>> print(importlib.find_loader('idlelib').path)"
>> C:\Python\Python35\lib\idlelib\__init__.pyc
>
> This file should not exist. Python 3 stores .pyc files in a
> __pycache__ subdirectory. It won't even run "idlelib\__init__.pyc" if
> "idlelib\__init__.py" exists, so your installation is incomplete and
> damaged. I suggest that you uninstall Python 3.5 and then completely
> remove "C:\Python\Python35" before reinstalling.

'python -m xyz', where xyz is a package name (directory on disk), runs 
xyx/__main__.py (or the xyz/__pycache__/__main__...34.py compiled 
version).  This file currently contains the following implementation, 
subject to change.

"""
IDLE main entry point

Run IDLE as python -m idlelib
"""
import idlelib.PyShell
idlelib.PyShell.main()
# This file does not work for 2.7; See issue 24212.

The errant __init__.pyc should not directly be a problem, but does 
indicate something wrong, such as 2.7 files mixed into your 3.5 install 
(__cache__ is *not* used in 2.7).  Based on my experience with this 
happening, you might try running chkdsk, from an elevated Command Prompt.

'python -m idlelib.idle' runs idlelib/idle.py (or the cached version) to 
mostly the same effect.   The alternate entry has adjustments so it 
works in an uninstalled development repository, while still working in 
an installation.

 From a python program, 'import idlelib.idle' needed as 'import idlelib' 
would run idlelib/__init__.py, which is empty.

-- 
Terry Jan Reedy