Virtualenv+pipenv virtual environment management

Virtual environment is mainly to create mutually independent operating environment for different projects ; In a virtual environment , Each project has its own dependency package , And isolated from other projects ; The same package can have different versions in different virtual environments , And there is no limit to the number of virtual environments , We can use tools virtualenv perhaps pipenv To create a virtual environment .

virtualenva Installation and use -windows

1. install virtualenv

pip install virtualenv

2. Install the virtual environment management pack virtualenv

pip install virtualenvwrapper(win-->virtualenvwrapper-win)

3. Create a directory to hold the virtual environment （ Name it .env or .virtualenv)

4. Configure environment variables （ Variable name ：WORKON_HOME, value ： The directory path of the virtual environment created above ）

MAC:

1. install virtualenv

$ sudo pip install virtualenv

2. Install the virtual environment management pack Virtaulenvwrapper yes virtualenv The expansion pack, , It's easier to add , Delete , Copy , Switch virtual environment . Run the following command to install successfully , Default installed in  /usr/local/bin below ：

$ sudo easy_install virtualenvwrapper 

3. see virtualenv Version of

virtualenv --version.

 

4. Create virtual environment Directory , And enter

$ mkdir ~/workspaces
$ cd ~/workspaces

5. Next, create a folder , Used to store all virtual environments ： 

$ mkdir ~/workspaces
$ cd ~/workspaces

6. Set the environment variable ： $ export WORKON_HOME=~/workspaces
$ source /usr/local/bin/virtualenvwrapper.sh

7. Creating a virtual environment

$ mkvirtualenv env1
$ mkvirtualenv env2

8. List all virtual environments :

$ workon

9. Switch to a virtual environment ：

$ workon env1

10. Exit virtual environment ：

$ deactivate

11. Delete virtual environment ：

$ rmvirtualenv env2

12. After switching to a virtual environment , Reuse pip Install in the current environment

$ workon env1
$ pip install numpy

Be careful , Every time before entering the virtual environment , Environment variables should be configured first :

$ cd ~/workspaces
$ export WORKON_HOME=~/workspaces
$ source /usr/local/bin/virtualenvwrapper.sh
$ workon env1

After starting the virtual environment ,pycharm Configure project interpreter, Find the corresponding virtual environment python file , such as :

   ~/workspaces/env1/bin/python2.7