如何升級virtualenv使用新的系統python？

Question

我已經在系統上用python2.6安裝了virtualenv。

我將系統python升級到2.7，但virtualenv仍然對python2.6有親和力。

我試過easy_install - 升級virtualenv，但沒有改變任何東西。

有誰知道如何更新系統安裝virtualenv使用系統上的新python2.7？

Answer 1

你可以從虛擬環境中嘗試pip install -U python，不知道它會破壞什麼。

您也可以更改指向舊Python的符號鏈接，但不知道會有哪些副作用。

我會推薦最安全的路徑，即先到pip freeze > installed.txt，然後用你的新Python和pip install -r installed.txt重新創建你的virtualenv。

Answer 2

安裝pip，easy_install和virtualenv命令每 python版本（python 2.6,2.7等）。

你必須通過installing it directly安裝的easy_install新副本爲你的Python版本（見setuptools installation instructions，或做pip相同。

然後，您可以使用這個新的安裝，捆綁到Python 2.7，安裝virtualenv

新的命令是有可能的，已安裝爲pip-2.7或easy_install-2.7;看到setuptools documentation on multiple python versions，pip和easy_install本身可能是一個符號鏈接到他們的2.6版本嘗試運行。或easy_install-2.7 virtualenv。

如果不適合你，你可以隨時使用-m開關來代替：

python2.7 -m easy_install virtualenv 

Answer 3

我創建了一個腳本來重新生成的virtualenv（S）：https://gist.github.com/WoLpH/fb98f7dc6ba6f05da2b8

如果你有許多更新，你可以使用這個腳本使用GNU平行並行化：https://gist.github.com/WoLpH/fb98f7dc6ba6f05da2b8#file-recreate_virtualenvs-sh

#!/bin/zsh -e 

export PATH="/usr/local/bin:$PATH" 
. $(which virtualenvwrapper.sh) 

envs=$(find ~/envs -mindepth 1 -maxdepth 1 -type d -print -or -name '*.sparseimage' -print | sed -e 's/.*\///' | sed 's/.sparseimage$//' | sort -u) 
echo "$envs" | parallel -v --no-notice ~/scripts/recreate_virtualenv.sh {} 

只需將它複製到文件（d可執行文件如下：zsh -e recreate_virtualenvs.sh <project_name>

#!/bin/zsh -e 

if [ ! -d "$PROJECT_HOME" ]; then 
    echo 'Your $PROJECT_HOME needs to be defined' 
    echo 'http://virtualenvwrapper.readthedocs.org/en/latest/install.html#location-of-project-directories' 
    exit 1 
fi 

if [ "" = "$1" ]; then 
    echo "Usage: $0 <project_name>" 
    exit 1 
fi 

env="$1" 
project_dir="$PROJECT_HOME/$1" 
env_dir="$HOME/envs/$1" 

function command_exists(){ 
    type $1 2>/dev/null | grep -vq ' not found' 
} 

if command_exists workon; then 
    echo 'Getting virtualenvwrapper from environment' 
    # Workon exists, nothing to do :) 

elif [ -x ~/bin/mount_workon ]; then 
    echo 'Using mount workon' 
    # Optional support for packaged project directories and virtualenvs using 
    # https://github.com/WoLpH/dotfiles/blob/master/bin/mount_workon 
    . ~/bin/mount_workon 
    mount_file "$project_dir" 
    mount_file "$env_dir" 

elif command_exists virtualenvwrapper.sh; then 
    echo 'Using virtualenvwrapper' 
    . $(which virtualenvwrapper.sh) 
fi 

if ! command_exists workon; then 
    echo 'Virtualenvwrapper not found, please install it' 
    exit 1 
fi 

rmvirtualenv $env || true 

echo "Recreating $env" 
mkvirtualenv $env || true 
workon "$env" || true 
pip install virtualenv{,wrapper} 

cd $project_dir 
setvirtualenvproject 

if [ -f setup.py ]; then 
    echo "Installing local package" 
    pip install -e . 
fi 

function install_requirements(){ 
    # Installing requirements from given file, if it exists 
    if [ -f "$1" ]; then 
     echo "Installing requirements from $1" 
     pip install -r "$1" 
    fi 
} 

install_requirements requirements_test.txt 
install_requirements requirements-test.txt 
install_requirements requirements.txt 
install_requirements test_requirements.txt 
install_requirements test-requirements.txt 

if [ -d docs ]; then 
    echo "Found docs, installing sphinx" 
    pip install sphinx{,-pypi-upload} py 
fi 

echo "Installing ipython" 
pip install ipython 

if [ -f tox.ini ]; then 
    deps=$(python -c " 
parser=__import__('ConfigParser').ConfigParser(); 
parser.read('tox.ini'); 
print parser.get('testenv', 'deps').strip().replace('{toxinidir}/', '')") 
    echo "Found deps from tox.ini: $deps" 
    echo $deps | parallel -v --no-notice pip install {} 
fi 

if [ -f .travis.yml ]; then 
    echo "Found deps from travis:" 
    installs=$(grep 'pip install' .travis.yml | grep -v '\$' | sed -e 's/.*pip install/pip install/' | grep -v 'pip install . --use-mirrors' | sed -e 's/$/;/') 
    echo $installs 
    eval $installs 
fi 

deactivate