Always forget how to do it after upgrading Python, so just write it down.

Manual

$ cd ~/.virtualenvs  
$ find ${envname}/ -type l -delete  
$ virtualenv ${envname}

Script for one virtualenv

Here's a tiny script from Fix python virtualenv after python update · GitHub for doing this. 

fix_virtualenv.sh  
---  
#!/usr/bin/env bash  
ENV_PATH="$(dirname "$(dirname "$(which pip)")")"  
SYSTEM_VIRTUALENV="$(which -a virtualenv|tail -1)"  

echo "Ensure the root of current virtualenv:"  
echo "    $ENV_PATH"  
read -p "‼️  Say no if you are not sure (y/N) " -n 1 -r  
echo  
if [[ $REPLY =~ ^[Yy]$ ]]; then  
    echo "♻️  Removing old symbolic links......"  
    find "$ENV_PATH" -type l -delete -print  
    echo "💫  Creating new symbolic links......"  
    $SYSTEM_VIRTUALENV "$ENV_PATH"  
    echo "🎉  Done!"  
fi

Steps

$ source ~/.virtualenvs/${envname}/bin/activate.sh  
$ chmod u+x ./fix_virtualenv.sh  
$ ./fix_virtualenv.sh

Script for all virtualenvs under ~/.virtualenvs

Based on the above script which for only one virtualenv,
I modified it to a slighty powerful script to fix all virtualenvs (include reinstall all modules in a virtualenv).

One liner (Network needed)

  • curl
    • sh <(curl -sL https://gist.githubusercontent.com/M157q/e1bf93a4a8170fabac24db9aee686caf/raw)
  • wget
    • sh <(wget -qO- https://gist.githubusercontent.com/M157q/e1bf93a4a8170fabac24db9aee686caf/raw)

Plaintext

fix_virtualenvs.sh  
---  
#!/usr/bin/env bash  

VIRTUALENVS_ROOT_DIR="${HOME}/.virtualenvs"  
ACTIVE_SH_PATH="/bin/activate"  

for dir in `find ${VIRTUALENVS_ROOT_DIR} -type d -maxdepth 1`  
do  
    if [[ ${dir} == ${VIRTUALENVS_ROOT_DIR} ]]; then  
        continue  
    fi  

    source ${dir}${ACTIVE_SH_PATH}  

    ENV_PATH="$(dirname "$(dirname "$(which pip)")")"  
    SYSTEM_VIRTUALENV="$(which -a virtualenv|tail -1)"  

    echo  
    echo "Ensure the root of current virtualenv:"  
    echo "    $ENV_PATH"  
    read -p "Say no if you are not sure (y/N) " -n 1 -r  
    echo  
    if [[ $REPLY =~ ^[Yy]$ ]]; then  

        read -p "Reinstall all packages of this virtualenv after upgraded? (y/N) " -n 1 -r  


        if [[ $REPLY =~ "^[Yy]$" ]]; then  
            echo "Dump pip freeze for current virtualenv into requirements.temp"  
            pip freeze > requirements.temp  
        fi  

        VIRTUALENV_PYTHON_VERSION=`python --version`  
        echo "Removing old symbolic links......"  
        find "$ENV_PATH" -type l -delete -print  

        echo "Creating new symbolic links......"  
        echo ${VIRTUALENV_PYTHON_VERSION}  
        if [[ $VIRTUALENV_PYTHON_VERSION =~ "Python 2" ]]; then  
            echo "Use Python 2 environment for this virtualenv"  
            $SYSTEM_VIRTUALENV "$ENV_PATH" --python=python2  
        elif [[ $VIRTUALENV_PYTHON_VERSION =~ "Python 3" ]]; then  
            echo "Use Python 3 environment for this virtualenv"  
            $SYSTEM_VIRTUALENV "$ENV_PATH" --python=python3  
        else  
            echo "Unknown Python version of this virtualenv"  
        fi  

        if [[ $REPLY =~ "^[Yy]$" ]]; then  
            echo "Reinstall modules from previous dumped pip freeze result."  
            pip install -r requirements.temp  

            echo "Remove requirements.temp"  
            rm requirements.temp  
        fi  
    fi  

    deactivate  
done  

echo "Done!"

References

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