[issue40272] ModuleNotFoundEror thrown by system python while accessing it specifically via venv python

[Ned Deily]

Ned Deily  added the comment:

One additional thought: there was a longstanding issue specific to using venv 
on macOS that has recently been fixed (Issue22490); that fix will be released 
first in Python 3.8.3 which should be available in a few weeks (or, if you are 
comfortable doing so, you could build it yourself from the current 3.8 branch 
on Github). If the problem isn't solved otherwise, you could try to see if that 
fix in 3.8.3 helps.

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[issue40272] ModuleNotFoundEror thrown by system python while accessing it specifically via venv python

[Ned Deily]

Ned Deily  added the comment:

Without more information, in particular, a reproducible test case, we can only 
speculate what might be going on.  Suggest you try using some of the debugging 
tools Python includes, starting with invoking your virtualenv python with the 
-vv flag. As described here (https://docs.python.org/3/using/cmdline.html#id4) 
that should show what files are being searched when you attempt to do the 
failing import.  You should also try looking at the results of invoking that 
python with -m test.pythoninfo and examining the values of sys.path and any 
PYTHON* environment variables. If the problem persists, copy the results here. 
Good luck! (Note that Python 2.7 has reached end-of-life and is no longer 
supported here.)

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versions:  -Python 2.7

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[issue40272] ModuleNotFoundEror thrown by system python while accessing it specifically via venv python

[Gavin D'souza]

New submission from Gavin D'souza :

I have a tool that works as a wrapper over a web framework which in turn 
utilizes a virtualenv environment. So every app to be installed for a project 
is installed in it's own env folder. 

Recently, the virtualenv has been breaking throwing 'ModuleNotFoundError's 
however this issue only persists in macOS. The applications installed in each 
project's env are editable installs. The ModuleNotFoundError's are raised by 
the global python install which is all the more confusing as the commands are 
specifically executing using absolute paths in the env python and should be in 
the env site-packages. Even after successful env installs, activating the env 
and simply typing "import frappe" throws a ModuleNotFoundError. 

Reference commands executed by the wrapper program are like
./env/bin/python -m install -q -U -e ./apps/frappe

have also tried absolute paths but faced the same issue. However, this issue 
doesn't persist while using pyenv on macOS. Linux systems work fine too.

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components: macOS
messages: 366299
nosy: gavin, ned.deily, ronaldoussoren
priority: normal
severity: normal
status: open
title: ModuleNotFoundEror thrown by system python while accessing it 
specifically via venv python
type: behavior
versions: Python 2.7, Python 3.6, Python 3.7, Python 3.8

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