在 venv 上一次运行不同 python 版本的命令 CMD

Question

I am currently running python 3.9 on my system. Due to the incompatibility of some of python libraries like numba on python 3.9 I will have to use previous versions. What cmd commands will I have to use to create a virtual environment so that I could run python 3.6 on cmd separate from python 3.9. I have a windows 10 64 bit system, I dont use conda or anything.

CMD Output:

C:\Users\maste>python -V
Python 3.9.1

Answer 1

In Windows you can utilize the Python Launcher for Windows . You can just install multiple Python versions from Python.org, and then use

py -3.6 -m venv venv

To create a virtual environment called "venv" (the last argument is the name). After that just activate your virtual environment and python will point to the Python 3.6 in your virtual environment.

Instead of the py launcher, you can also just use the full file path of the Python 3.6 (assuming Powershell, hence & ):

& "C:\path\to\python 3.6\python.exe" -m venv venv

Lastly, you don't have to activate the virtual environment, if you don't want to. You can just run

<path-to-project>\venv\Scripts\python.exe myscript.py