How to install a package inside virtualenv

Question

I created a virtualenv with the following command   mkvirtualenv --distribute --system-site-packages   1    After starting the virtualenv with workon  I type ipython  It prompts me   WARNING  Attempting to work in a virtualenv  If you encounter problems  please install IPython inside the virtualenv    When I try to install ipython with the virtualenv  I got the following error message   pip install ipython Requirement already satisfied  use --upgrade to upgrade   ipython in  Library Frameworks Python framework Versions 2 7 lib python2 7 site-packages Cleaning up      Does anyone know how to install inside the virtualenv

User · Answer

Sharing what has worked for me in both Ubuntu and Windows. This is for python3. To do for python2, replace "3" with "2":

Ubuntu

pip install virtualenv --user
virtualenv -p python3 /tmp/VIRTUAL
source /tmp/VIRTUAL/bin/activate
which python3

To install any package: pip install package

To get out of the virtual environment: deactivate

To activate again: source /tmp/VIRTUAL/bin/activate

Full explanation here.

Windows

(Assuming you have MiniConda installed and are in the Start Menu > Anaconda > Anaconda Terminal)

conda create -n VIRTUAL python=3  
activate VIRTUAL

To install any package: pip install package or conda install package

To get out of the virtual environment: deactivate

To activate again: activate VIRTUAL

Full explanation here.

User · Answer

To further clarify the other answer here   Under the current version of virtualenv  the --no-site-packages flag is the default behavior  so you don t need to specify it   However  you are overriding the default by explicitly using the --system-site-packages flag  and that s probably not what you want   The default behavior  without specifying either flag  is to create the virtual environment such that when you are using it  any Python packages installed outside the environment are not accessible   That s typically the right choice because it best isolates the virtual environment from your local computer environment   Python packages installed within the environment will not affect your local computer and vice versa   Secondly  to use a virtual environment after it s been created  you need to navigate into the virtual environment directory and then run   bin activate   What this does is to configure environment variables so that Python packages and any executables in the virtual environment s bin folders will be used before those in the standard locations on your local computer   So  for example  when you type  pip   the version of pip that is inside your virtual environment will run instead of the version of pip on your local machine   This is desirable because pip inside the virtual environment will install packages inside the virtual environment   The problem you are having is because you are running programs  like ipython  from your local machine  when you instead want to install and run copies of those programs isolated inside your virtual environment   You set this up by creating the environment  without specifying any site-packages flags if you are using the current version   running the activate script mentioned above  then running pip to install any packages you need  which will go inside the environment

User · Answer

Well i don t have an appropriate reason regarding why this behavior occurs but then i just found a small work around     Inside the VirtualEnvironment   pip install -Iv package name  version number   now this will install the version in your virtual environment     Additionally you can check inside the virtual environment with this   pip install yolk yolk -l   This shall give you the details of all the installed packages in both the locations system and virtualenv   While some might say its not appropriate to use --system-site-packages  it may be true   but what if you have already done a lot of stuffs inside your virtualenv  Now you dont want to redo everything from the scratch   You may use this as a hack and be careful from the next time

User · Answer

To use the environment virtualenv has created  you first need to source env bin activate  After that  just install packages using pip install package-name

User · Answer

I had the same issue and the --no-site-packages did not work for me  I discovered on this older mailing list archive that you are able to force an installation in the virtualenv using the -U flag for pip  eg pip -U ipython  You may verify this works using the bash command which ipython while in the virtualenv   source  https   mail python org pipermail python-list 2010-March 571663 html

User · Answer

Sharing a personal case if it helps  It is that a virtual environment was previously arranged  Its path can be displayed by  echo  VIRTUAL ENV  Make sure that the it is writable to the current user  If not  using      sudo ipython  would certainly clear off the warning message   In anaconda  if  VIRTUAL ENV is independently arranged  one can simply delete this folder or rename it  and then restart the shell  Anaconda will recover to its default setup

User · Answer

You can go to the folder where your venv exists and right click -  git bash here  Then you just right python -m pip install ipython and it will install inside the folder   I find it even more convenient with the virtualenv package that creates the venv inside the project s folder

User · Answer

From documentation https   docs python org 3 library venv html       The pyvenv script has been deprecated as of Python 3 6 in favor of using python3 -m venv to help prevent any potential confusion as to which Python interpreter a virtual environment will be based on    In order to create a virtual environment for particular project  create a file  home user path to create venv sh      usr bin env bash    define path to your project s directory PROJECT DIR  home user path to Project1    a directory with virtual environment   will be created in your Project1 directory   it recommended to add this path into your  gitignore VENV DIR    PROJECT DIR   venv    https   docs python org 3 library venv html python3 -m venv    VENV DIR      activates the newly created virtual environment      VENV DIR   bin activate    prints activated version of Python python3 -V  pip3 install --upgrade pip    Write here all Python libraries which you want to install over pip   An example or requirements txt see here    https   docs python org 3 tutorial venv html managing-packages-with-pip pip3 install -r    PROJECT DIR   requirements txt  echo  Virtual environment   VENV DIR  has been created   deactivate   Then run this script in the console      bash  home user path to create venv sh

User · Answer

For Python 3    pip3 install virtualenv  python3 -m venv venv name  source venv name bin activate   key step  pip3 install  package-name

User · Answer

Avoiding Headaches and Best Practices    Virtual Environments are not part of your git project  they don t need to be versioned    They can reside on the project folder  locally   but  ignored on your  gitignore   After activating the virtual environment of your project  never   sudo pip install package   After finishing your work  always  deactivate  your environment  Avoid renaming your project folder       For a better representation  here s a simulation   creating a folder for your projects environments    mkdir venv   creating environment    cd venv      virtualenv google drive New python executable in google drive bin python Installing setuptools  pip   done    activating environment    source google drive bin activate   installing packages   google drive    pip install PyDrive Downloading unpacking PyDrive Downloading PyDrive-1 3 1-py2-none-any whl                 Successfully installed PyDrive PyYAML google-api-python-client oauth2client six uritemplate httplib2 pyasn1 rsa pyasn1-modules Cleaning up      package available inside the environment   google drive    python Python 2 7 6  default  Oct 26 2016  20 30 19    GCC 4 8 4  on linux2 Type  help    copyright    credits  or  license  for more information   gt  gt  gt   gt  gt  gt  import pydrive auth  gt  gt  gt     gt  gt  gt  gdrive   pydrive auth GoogleAuth    gt  gt  gt    deactivate environment   google drive    deactivate        package NOT AVAILABLE outside the environment    python Python 2 7 6  default  Oct 26 2016  20 32 10    GCC 4 8 4  on linux2 Type  help    copyright    credits  or  license  for more information   gt  gt  gt   gt  gt  gt  import pydrive auth Traceback  most recent call last   File   lt stdin gt    line 1  in  lt module gt  ImportError  No module named pydrive auth  gt  gt  gt       Notes   Why not sudo       Virtualenv creates a whole new environment for you  defining  PATH and some other variables and settings  When you use sudo pip install package  you are running Virtualenv as root  escaping the whole environment which was created  and then  installing  the package on global site-packages  and not inside the project folder where you have a Virtual Environment  although you have activated the environment    If you rename the folder of your project           you ll have to adjust some variables from some files inside the bin directory of your project       For example       bin pip  line 1  She Bang       bin activate  line 42  VIRTUAL ENV

User · Answer

Create your virtualenv with --no-site-packages if you don t want it to be able to use external libraries   virtualenv --no-site-packages my-virtualenv   my-virtualenv bin activate pip install ipython   Otherwise  as in your example  it can see a library installed in your system Python environment as satisfying your requested dependency

[python] How to install a package inside virtualenv?

Ubuntu

Windows

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