[issue40734] /usr/bin surprisingly in sys.path under IDLE

[Terry J. Reedy]

Terry J. Reedy  added the comment:

Lib/idlelib contains a startup file 'idle.py' (and 'idle.bat' and 'idle.pyw' on 
Windows).  IDLE, and I, have no control over the installation of IDLE, 
including the addition of system-specific auxiliary startup files and entries, 
with names containing 'idle', outside of /idlelib.  On Windows, there is no 
addition in pythondir/Scripts.  The 'IDLE' Start menu shortcut run 
idlelib/idle.pyw.

I believe IDLE's only manipulation of sys.path for the user process is to 
prepend '' or the the edited file's directory.  In my message above describing 
a possible experiment, 'sys.python' should be sys.path.  You can keep exploring 
if you want, but I am closing this for now.

--
resolution: works for me -> not a bug
stage:  -> resolved
status: open -> closed

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[issue40734] /usr/bin surprisingly in sys.path under IDLE

[E. Paine]

E. Paine  added the comment:

This is simply because the Python interpreter is running from /usr/bin. This is 
shown if you call:

cp /usr/bin/idle idle
./idle

In this case, the Python interpreter is running from the directory you are in 
and /usr/bin shouldn't(!) show in the path (at least on my system...)

--
nosy: +epaine

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[issue40734] /usr/bin surprisingly in sys.path under IDLE

[paul rubin]

paul rubin  added the comment:

Yes as mentioned I'm running Debian GNU/Linux, not Windows.  By "idle is 
installed in /usr/bin" I mean that it is an executable shell script stored at 
/usr/bin/idle .  Yes, shell prompt is the $ prompt to bash.  When I run 
"python3 -m idlelib", /usr/bin does not appear in sys.path.  "python -m 
idlelib" attempts to run python2 and I don't have python2 idle installed.  I'll 
see if I can figure out what's going on with sys.path in the user process.  The 
explanation about the two processes was helpful.  Thanks.

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[issue40734] /usr/bin surprisingly in sys.path under IDLE

[Terry J. Reedy]

Terry J. Reedy  added the comment:

'IDLE' is an application implemented by Lib/idlelib.  At least on Windows, 
application startup executables (like pip.exe, on Windows) are normally 
installed in /Scripts, at least on Windows.  What, precisely, in 
'installed in /usr/bin'?

By 'shell prompt', I presume you mean the $ prompt of bash or older unix shell. 
 What precisely did you type?  What happens if you start with
$ python3 -m idlelib
?

Unless you add -n to the above, IDLE runs in two processes: the IDLE process 
that runs the IDLE GUI and the user process that runs user code under the 
supervision of idlelib/run.py.  Each has its own sys and sys.path.  You are 
seeing the user process sys.path.

To see how python initially sets sys.python in the user process, before IDLE 
can possible modify it, edit idlelib.run by (temporarily) adding

print(sys.path, file=sys.__stdout__)

after 'import sys'.  To do this with IDLE, click File => Open module and enter 
'idlelib.run'.  In case you mistakenly make IDLE not run, note where the file 
is and maybe make a backup first.  Then close and start IDLE in your terminal 
and you should see sys.path printed there.  You may see it twice.

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[issue40734] /usr/bin surprisingly in sys.path under IDLE

[paul rubin]

paul rubin  added the comment:

I'm using Debian 10 MATE live install and have been running IDLE by clicking an 
icon on the top panel, but I just tried running IDLE from the shell prompt in a 
terminal window, and also see /usr/bin in the path.  In both cases, the output 
of os.system('pwd').read() is my home directory.  IDLE itself is installed in 
/usr/bin .

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[issue40734] /usr/bin surprisingly in sys.path under IDLE

[Terry J. Reedy]

Terry J. Reedy  added the comment:

*Exactly* how are you starting IDLE?  This should only happen if you start IDLE 
in /usr/bin or edit a file in /usr/bin.  Is there any such thing on 
Linux/Debian as 'start IDLE from an icon', as on Windows?  If so, is the 
starting directory part of the icon configuration, as on Windows?

--
nosy: +cheryl.sabella

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[issue40734] /usr/bin surprisingly in sys.path under IDLE

[paul rubin]

paul rubin  added the comment:

Matthias, I get the same result you do when I run python from the shell command 
line.  I see /usr/bin in the path when I import sys and print sys.path from 
inside IDLE.  In other words this is an IDLE configuration oddity.  Again I 
don't know if it's a bug.  It's perplexing though.

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[issue40734] /usr/bin surprisingly in sys.path under IDLE

[Matthias Klose]

Matthias Klose  added the comment:

I can't reproduce that:

$ python3.7 -c 'import sys; print (sys.path)'
['', '/usr/lib/python37.zip', '/usr/lib/python3.7', 
'/usr/lib/python3.7/lib-dynload', '/usr/local/lib/python3.7/dist-packages', 
'/usr/lib/python3/dist-packages']

--
resolution:  -> works for me

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[issue40734] /usr/bin surprisingly in sys.path under IDLE

[Ned Deily]

Change by Ned Deily :


--
nosy: +doko

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[issue40734] /usr/bin surprisingly in sys.path under IDLE

[paul rubin]

New submission from paul rubin :

This is in the standard python 3.7.3 install under Debian 10.  It's possible 
that this is on purpose, and it's (separately) possible that the Debian 
packagers did this for some reason.  I'm not sure it's a bug but am reporting 
it as it's an oddity that might warrant looking into.

When I look at sys.path in the IDLE shell, the path includes /usr/bin, which is 
not there under the normal python prompt.  Since /usr/bin is not a place where 
python modules usually live, it's a bit strange to find it on the path.  It 
doesn't seem healthy since it could lead to surprises.  But maybe I'm missing 
something.

Feel free to close this if the inclusion is intentional.

--
assignee: terry.reedy
components: IDLE
messages: 369643
nosy: phr, terry.reedy
priority: normal
severity: normal
status: open
title: /usr/bin surprisingly in sys.path under IDLE
type: behavior
versions: Python 3.7

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