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I have a Flask application that is running in a Python 2 virtual environment.
I'm looking to run a Python 3 program, so I need to install python3 into the virtual environment. How do I do this? Do I have to recreate the environment? Is this a difficult migration?
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virtualenv as venv replacement ** You can actually install it with any Python version, but then you will have to specify --python=/opt/python-2.7/bin/python or --python=python2. 7 when running virtualenv . By default, it uses the python executable that was used to install it.
Since Python is available on Windows 10, you can also use virtual environments on Windows 10. Typically, using a Python 3 virtual environment in Windows 10 involves the following steps: Installing Python 3 with pip and several features. Creating a Python 3 virtual environment with Python 3 venv module. Activating the Python 3 virtual environment.
py -m pip install --user virtualenv Creating a virtual environment ¶ venv (for Python 3) and virtualenv (for Python 2) allow you to manage separate package installations for different projects. They essentially allow you to create a “virtual” isolated Python installation and install packages into that virtual installation.
pip 21.1.3 from c:\python39\lib\site-packages (Python 3.9.4) Installing virtualenv¶ Note If you are using Python 3.3 or newer, the venvmodule is the preferred way to create and manage virtual environments. venv is included in the Python standard library and requires no additional installation.
After the virtual environment is deactivated, your command prompt will switch to the global Python 3 environment. In addition, those Python 3 dependencies that you had installed in your virtual environment will not be available. Clivant a.k.a Chai Heng enjoys composing software and building systems to serve people.
It's not recommended to mix multiple versions of Python. In fact, I don't think it's even possible.
Creating a new virtualenv isn't difficult at all:
Get the list of modules in the current virtualenv
source /path/to/current/bin/activate
pip freeze > /tmp/requirements.txt
Create a new virtualenv. Either change into a suitable directory before executing the virtualenv command or give a full path.
deactivate
virtualenv -p python3 envname
Install modules
source envname/bin/activate
pip install -r /tmp/requirements.txt
That's it.
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