Use different Python version with virtualenv

Question

I have a Debian system currently running with python 2 5 4  I got virtualenv properly installed  everything is working fine  Is there a possibility that I can use a virtualenv with a different version of Python   I compiled Python 2 6 2 and would like to use it with some virtualenv  Is it enough to overwrite the binary file  Or do I have to change something in respect to the libraries

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Suppose you currently have python 2 7 installed in your virtualenv  But want to make use of python3 2  You would have to update this with     virtualenv --python  usr bin python3 2 name of your virtualenv   Then activate your virtualenv by     source activate name of your virtualenv   and then do  python --version in shell to check whether your version is now updated

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This worked for my usage in Windows 10  where I have Python 3 7 and want to downgrade for a project in Python 3 6 6  I used  quot venv quot  to create a new environment called  quot venv quot   I downloaded from https   www python org downloads windows    install  quot Download Windows x86-64 executable installer- quot    then I used the following command line in the directory where I want to create my environment  gt C  Users     Python Python36 python exe -m venv venv Finally  I activated the environnent using the command line   gt venv Scripts activate bat And check the python version by calling   gt python --version Python 3 6 6

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UBUNTU 19 04   Global Python 3 7  This worked for me  enabling a Python 3 8 environment using the recommended venv for python 3 development  Install 3 8 and 3 8 venv module    sudo apt install python3 8 python3 8-venv plus any other modules you need Create your Virtual Env using the python version you want in that env    usr bin python3 8 -m venv python38-env  switch into your virtual env   source python38-env bin activate  python -V   python 3 8

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There is an easier way    virtualenv venv --python python2 7   Thanks to  a comment  this only works if you have python2 7 installed at the system level  e g   usr bin python2 7    Otherwise  if you are using homebrew you can use the path to give you what you want   virtualenv venv --python  usr local bin python   You can find the path to your python installation with   which python   This will also work with python 3    which python3  gt  gt   usr local bin python3 virtualenv venv --python  usr local bin python3   Ultimately condensing to   virtualenv venv -p  which python  virtualenv venv -p  which python3

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In windows subsystem for linux    Create environment for python3   virtualenv --python  usr bin python3 env  Activate it   source env bin activate

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For Mac High Sierra   install the virtualenv on python3 and create a virtualenv for python2      python3 -m pip install virtualenv    python3 -m virtualenv --python python2 vp27    source vp27 bin activate   vp27   python --version  Python 2 7 14

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For Debian  debian 9  Systems in 2019  I discovered a simple solution that may solve the problem from within the virtual environment   Suppose the virtual environment were created via   python3 7 -m venv myenv   but only has versions of python2 and python2 7  and you need the recent features of python3 7    Then  simply running the command    myvenv    python3 7 -m venv --upgrade  home username path to myvenv    will add python3 7 packages if they are already available on your system

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It worked for me on windows with python 2 installation     Step 1  Install python 3 version    Step 2  create a env folder for     the virtual environment  Step 3   c  Python37 python -m venv     c  path to env    This is how i created Python 3 virtual environment on my existing python 2 installation

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On windows   py -3 4x32 -m venv venv34   or   py -2 6 2 -m venv venv26   This uses the py launcher which will find the right python executable for you  assuming you have it installed

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On the mac I use pyenv and virtualenvwrapper  I had to create a new virtualenv  You need homebrew which I ll assume you ve installed if you re on a mac  but just for fun   ruby -e    curl -fsSL https   raw githubusercontent com Homebrew install master install     brew install pyenv pyenv install 2 7 10 pyenv global 2 7 10 export PATH  Users  USERNAME   pyenv versions 2 7 10 bin  PATH mkvirtualenv -p    pyenv versions 2 7 10 bin python   virtual env name    I also froze my requirements first so i could simply reinstall in the new virtualenv with   pip install -r requirements txt

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It worked for me  sudo apt-get install python3-minimal  virtualenv --no-site-packages --distribute -p  usr bin python3    virtualenvs py3

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These seem a little overcomplicated for Windows  If you re on Windows running python 3 3 or later  you can use the python launcher py to do this much more easily  Simply install the different python version  then run   py - my version  -m venv env   This will create a virtual environment called env in your current directory  using python  my version   As an example   py -3 7 -m venv env   env Scripts activate   This creates a virtual environment called env using python3 7 and activates it  No paths or other complex stuff required

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End of 2020  The most seamless experience for using virtualenv  added benefit  with any possible python version  would be to use pyenv and its  bundled  pyenv-virtualenv plugin  cf https   realpython com intro-to-pyenv  virtual-environments-and-pyenv  Usage  pyenv virtualenv  lt python version gt   lt environment name gt  Installation   first check that you ve got all prerequisites  depending on your OS   https   github com pyenv pyenv wiki Common-build-problems prerequisites curl https   pyenv run   bash exec  SHELL  cf https   github com pyenv pyenv-installer That being said  nowadays the best possible alternative instead of using virtualenv  and pip  would be Poetry  along with pyenv indicated above  to handle different python versions   Another option  because it s supported directly by the PyPA  the org behind pip and the PyPI  and has restarted releasing since the end of May  didn t release since late 2018 prior to that     would be Pipenv

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Yes  the above answers are correct and works fine on Unix based systems like Linux  amp  MAC OS X   I tried to create virtualenv for Python2  amp  Python3 with the following commands   Here I have used venv2  amp  venv3 as their names for Python2  amp  Python3 respectively      Python2  raquo    MacBook-Pro-2   admin  virtualenv venv2 --python  which python2  Running virtualenv with interpreter  usr local bin python2 New python executable in  Users admin venv2 bin python Installing setuptools  pip  wheel   done  MacBook-Pro-2   admin   MacBook-Pro-2   admin  ls venv2 bin  activate        easy install        pip2 7          python2 7 activate csh        easy install-2 7    python          wheel activate fish       pip         python-config activate this py    pip2            python2 MacBook-Pro-2   admin        Python3  raquo    MacBook-Pro-2   admin  virtualenv venv3 --python  which python3  Running virtualenv with interpreter  usr local bin python3 Using base prefix   Library Frameworks Python framework Versions 3 6  New python executable in  Users admin venv3 bin python3 Also creating executable in  Users admin venv3 bin python Installing setuptools  pip  wheel   done  MacBook-Pro-2   admin   MacBook-Pro-2   admin  ls venv3 bin  activate        easy install        pip3 6          python3 6 activate csh        easy install-3 6    python          wheel activate fish       pip         python-config activate this py    pip3            python3 MacBook-Pro-2   admin        Checking Python installation locations   MacBook-Pro-2   admin  which python2  usr local bin python2 MacBook-Pro-2   admin   MacBook-Pro-2   admin  which python3  usr local bin python3 MacBook-Pro-2   admin

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As already mentioned in multiple answers  using virtualenv is a clean solution  However a small pitfall that everyone should be aware of is that if an alias for python is set in bash aliases like   python python3 6   this alias will also be used inside the virtual environment  So in this scenario running python -V inside the virtual env will always output 3 6 regardless of what interpreter is used to create the environment    virtualenv venv --python pythonX X

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Here is the stepbystep how to create the Virtual environment in Visual Studio Code folder  I used Powershell  Administrator mode    1  I create a VSCode folder -  D  Code Python VE  where I want to create Virtual environment   2   Next I type the command -  pip3 install virtualenv    D  Code Python VE  pip3 install virtualenv    3  D  Code Python VE  python3 -m venv project env  4  D  Code Python VE project env Scripts activate bat  5  D  Code Python VE  ls - This will list a new directory  project env    6  D  Code Python VE  code   This will start Visual Studio Code  Make sure the command is  code      7  Create launch jason with following content            Use IntelliSense to learn about possible attributes         Hover to view descriptions of existing attributes         For more information  visit  https   go microsoft com fwlink  linkid 830387      version    0 2 0        configurations                            type    python                request    launch                name    Python  Current File  Integrated Terminal 1                 program      file                                     name    Python  Current File  Integrated Terminal 2                 type    python                request    launch                program      file                 console    integratedTerminal                       Please search how to go to Debug window and Add new Configuration in VS Code       Press F1 in Visual studio code and the command pallet will open - Select Python Interpreter and select the virtual environment project env   Add test py file with one statement print  Hello World    Run this program  In Visual studio Code terminal -  project env  d  Code Python VE python -m pip install --upgrade I hope this helps

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virtualenv -p python3 myenv   Link to Creating virtualenv

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I use pyenv to manage my python version   pyenv install 3 7 3 pyenv local 3 7 3   Check your python version     python --version Python 3 7 3   Create the virtual environment with venv   python -m venv     Then activate the Virtual Environment   source bin activate   Check your python version     python --version Python 3 7 3   You may need to remove the previous virtual environment  rm -rf bin

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This was a bug with virtualenv  Just upgrading your pip should be the fix   pip install --upgrade virtualenv

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Even easier  by using command substitution to find python2 for you   virtualenv -p   which python2   lt path to new virtualenv  gt   Or when using virtualenvwrapper     mkvirtualenv -p   which python2   lt env name gt

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The -p approach works well  but you do have to remember to use it every time   If your goal is to switch to a newer version of Python generally  that s a pain and can also lead to mistakes   Your other option is to set an environment variable that does the same thing as -p  Set this via your    bashrc file or wherever you manage environment variables for your login sessions   export VIRTUALENV PYTHON  path to desired version   Then virtualenv will use that any time you don t specify -p on the command line

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These are the steps you can follow when you are on a shared hosting environment and need to install  amp  compile Python from source and then create venv from your Python version  For Python 2 7 9  you would do something along these lines   mkdir   src wget http   www python org ftp python 2 7 9 Python-2 7 9 tgz tar -zxvf Python-2 7 9 tgz cd Python-2 7 9 mkdir    localpython   configure --prefix  HOME  localpython make make install   virtual env  cd   src wget https   pypi python org packages 5c 79 5dae7494b9f5ed061cff9a8ab8d6e1f02db352f3facf907d9eb614fb80e9 virtualenv-15 0 2 tar gz md5 0ed59863994daf1292827ffdbba80a63 tar -zxvf virtualenv-15 0 2 tar gz cd virtualenv-15 0 2     localpython bin python setup py install virtualenv ve -p  HOME  localpython bin python2 7 source ve bin activate      Naturally  this can be applicable to any situation where you want to replicate the exact environment you work and deploy on

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Mac OSX 10 6 8  Snow Leopard    1  When you do pip install virtualenv  the pip command is associated with one of your python versions  and virtualenv gets installed into that version of python   You can do     which pip      to see what version of python that is   If you see something like      which pip   usr local bin pip   then do     ls -al  usr local bin pip lrwxrwxr-x  1 root  admin  65 Apr 10  2015  usr local bin pip - gt           Library Frameworks Python framework Versions 2 7 bin pip   You can see the python version in the output   By default  that will be the version of python that is used for any new environment you create  However  you can specify any version of python installed on your computer to use inside a new environment with the -p flag       virtualenv -p python3 2 my env   Running virtualenv with interpreter  usr local bin python3 2   New python executable in my env bin python   Installing setuptools  pip   done         virtualenv my env will create a folder in the current directory which   will contain the Python executable files  and a copy of the pip    command  which you can use to install other packages    http   docs python-guide org en latest dev virtualenvs   virtualenv just copies python from a location on your computer into the newly created my env bin  directory    2  The system python is in  usr bin  while the various python versions I installed were  by default  installed into     usr local bin   3  The various pythons I installed have names like python2 7 or python3 2  and I can use those names rather than full paths            VIRTUALENVWRAPPER           1  I had some problems getting virtualenvwrapper to work   This is what I ended up putting in    bash profile     export WORKON HOME  HOME  virtualenvs export PROJECT HOME  HOME django projects   Not very important -- mkproject command uses this  Added the following based on    http   stackoverflow com questions 19665327 virtualenvwrapper-installation-snow-leopard-python export VIRTUALENVWRAPPER PYTHON  usr local bin python2 7   source  usr local bin virtualenvwrapper sh source  Library Frameworks Python framework Versions 2 7 bin virtualenvwrapper sh   2  The -p option works differently with virtualenvwrapper  I have to specify the full path to the python interpreter to be used in the new environment when I do not want to use the default python version        mkvirtualenv -p  usr local bin python3 2 my env Running virtualenv with interpreter  usr local bin python3 New python executable in my env bin python Installing setuptools  pip   done  Usage  source deactivate  removes the  bin  directory of the environment activated with  source activate  from PATH     Unlike virtualenv  virtualenvwrapper will create the environment at the location specified by the  WORKON HOME environment variable   That keeps all your environments in one place

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Yes you just need to install the other version of python  and define the location of your other version of python in your command like                   virtualenv  home payroll Documents env -p  usr bin python3

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Since Python 3  the Python Docs suggest creating the virtual environment with the following command   python3 -m venv  lt myenvname gt    Please note that venv does not permit creating virtual environments with other versions of Python  For that  install and use the virtualenv package     Obsolete information  The pyvenv script can be used to create a virtual environment  pyvenv  path to new virtual environment   but it has been deprecated since Python 3 6

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These two commands should work fine   virtualenv -p python2 myenv   For python2   virtualenv -p python3 myenv   For python3

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Under Windows for me this works   virtualenv --python c  Python25 python exe envname   without the python exe I got WindowsError   Error 5  Access is denied  I have Python2 7 1 installed with virtualenv 1 6 1  and I wanted python 2 5 2

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November 2019   I needed to install a Python 3 7 environment  env  on my Python 3 8-based Arch Linux system   Python 3 7 was no longer on the system  so I could not downgrade Python  to install a package that I needed   Furthermore  I wanted to use that package   Python 3 7 inside a virtual environment  venv    This is how I did it     Download Python version source files   I downloaded the Python 3 7 4 source files from     https   www python org downloads source    to   mnt Vancouver apps python versions src Python-3 7 4 tgz  I then extracted that archive  source files  to   mnt Vancouver apps python versions src Python-3 7 4     Installation    Note  in my system env  not a venv    cd  mnt Vancouver apps python versions src Python-3 7 4  time   configure                    17 sec time make                           1 min 51 sec time sudo make install              18 sec time make clean                     0 3 sec     Examine installed Python versions     which python  usr bin python    python --version Python 3 8 0    which python3 7  usr local bin python3 7    python       Python 3 8  system   env  Python 3 8 0  default  Oct 23 2019  18 51 26    GCC 9 2 0  on linux Type  help    copyright    credits  or  license  for more information   gt  gt  gt     python3 7       newly-installed Python 3 7 package Python 3 7 4  default  Nov 20 2019  11 36 53    GCC 9 2 0  on linux Type  help    copyright    credits  or  license  for more information   gt  gt  gt  import sys  gt  gt  gt  print sys version  3 7 4  default  Nov 20 2019  11 36 53    GCC 9 2 0   gt  gt  gt     python3 7 --version                                                                                                  Python 3 7 4     How to create a venv for a specific Python version      https   docs python org 3 tutorial venv html      12 2  CREATING VIRTUAL ENVIRONMENTS      The module used to create and manage virtual environments is called venv  venv will usually install the most recent version of Python that you have available  If you have multiple versions of Python on your system  you can select a specific Python version by running python3 or whichever version you want       To create a virtual environment  decide upon a directory where you want to place it  and run the venv module as a script with the directory path            python3 -m venv tutorial-env         This will create the tutorial-env directory if it doesn   t exist  and also create directories inside it containing a copy of the Python interpreter  the standard library  and various supporting files              Create Python 3 7 venv  on a Python 3 8 operating env   system    python3 7 -m venv   venv py3 7         create Python 3 7-based venv source   venv py3 7 bin activate       activate that venv deactivate                             deactivate that venv  when done  there    Added to    bashrc   alias p37  echo      Python 3 7 venv  source   venv py3 7 bin activate     amp  amp  source   venv py3 7 bin activate      Test Python 3 7 venv     p37                                                                                                                   Python 3 7 venv  source   venv py3 7 bin activate     py3 7   python --version Python 3 7 4   py3 7   python Python 3 7 4  default  Nov 20 2019  11 36 53    GCC 9 2 0  on linux Type  help    copyright    credits  or  license  for more information   gt  gt  gt  import sys  gt  gt  gt  print sys version  3 7 4  default  Nov 20 2019  11 36 53    GCC 9 2 0    gt  gt  gt

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You should have that Python version installed  If you have it then basically  With virtualenv  virtualenv --python python3 8 env place you want to save to  with venv python3 8 -m venv env place you want to save to  The above examples are for python3 8  you can change it to have different versions of virtual environments given that they are installed in your computer

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Surprised that no one has mentioned conda so far  I have found this is a lot more straightforward than the other methods mentioned here  Let s say I have python 3 9 and python 2 7 and a project I am working on was python 3 5 4  I could simply create the isolated virtual env for 3 5 4 with the conda command without downloading anything else  To see a list of available python versions first  use the command conda search  quot  python  quot  To create the virtual environment for python version x y z  use the command conda create -n yourenvname python x y z Activate venv with conda activate yourenvname Deactivate with conda deactivate To delete the virtual environment when done  use the command conda remove -n yourenvname --all

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I use Windows so I should use  exe on the pthon path virtualenv -p C  Python27 python2 exe  lt envname gt

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virtualenv --python  usr bin python2 6  lt path to myvirtualenv gt

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You can call virtualenv with python version you want  For example   python3 -m virtualenv venv   Or alternatively directly point to your virtualenv path  e g  for windows   c  Python34 Scripts virtualenv exe venv   And by running   venv bin python  Python 3 5 1  v3 5 1 37a07cee5969  Dec  5 2015  21 12 44    GCC 4 2 1  Apple Inc  build 5666   dot 3   on darwin Type  help    copyright    credits  or  license  for more information   gt  gt  gt    you can see the python version installed in virtual environment

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Just use the --python  or short -p  option when creating your virtualenv instance to specify the Python executable you want to use  e g    virtualenv --python  usr bin python2 6  lt path to new virtualenv  gt    N B  For Python 3 3 or later  refer to The Aelfinn s answer below

[python] Use different Python version with virtualenv

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