在一个脚本中运行两个版本的Python。 可能？

Question

I have a pure Python 3.7.3 and another Python 3.7.0 that comes with QGIS software bundle.

I set default Python as 3.7.0 and need to get some functions and modules working in 3.7.3.

I could set my default environment to a 3.7.3 but in this case I can not get an access to qgis.core lib. In 3.7.0 I need to perform from PyQt5 import QtWidgets but here it throws and error of missing dll. Re-installing pyqt5 will harm qgis and totally delete it.

So I see that I need to run scripts from 3.7.0 with Qt functions that work in pure 3.7.3. But how can I put in my script. I tried to test virtualenv but looks like it doesn't want to set a temporary environment.

Answer 1

I believe that you should deal with these issues and avoid using 2 different Python environments. But you could achieve this with pyenv .

Let's say that 3.7.0 is your system Python version. First, install pyenv and a 3.7.3 environment:

$ pyenv update
$ pyenv install 3.7.3
$ pyenv shell 3.7.3

Then, install PyQt5 and the other requirements with pip .

Eventually, you will be able to switch to a every installed versions, manually or within your script.

pyenv also supports virtual environments.

Answer 2

Made it.

In 3.7.0 script I add

import sys 
qt_bundle =['~long_path_to_appdata\\Python\\Python37-32\\lib\\site-packages\\'] # list in case I need to add more modules
sys.path+= qt_bundle

after that this statement

from PyQt5 import QtCore, QtWidgets

does not throw any error