Mac builds a multi-python development environment

# Mac installation of pyenv and the use of pyenv

When installing virtualwrapper on Mac, the error No module named virtualenvwrapper is reported

The default system of Mac is python2, and I myself use python3 installed by brew

The following is the problem that occurred during my installation

1. Install virtualwrapper, open a terminal, and enter the following command

pip3 install virtualenv
pip3 install virtualenvwrapper
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2. Add code in profile ~/.bash_profile

# Settings for virtualenvwrapper
export WORKON_HOME=$HOME/.virtualenvs
source /usr/local/bin/virtualenvwrapper.sh 
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3. Make the configuration take effect

source ~/.bash_profile
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At this time, the following problem occurred:

/usr/bin/python: No module named virtualenvwrapper
virtualenvwrapper.sh: There was a problem running the initialization hooks.
 
If Python could not import the module virtualenvwrapper.hook_loader,
check that virtualenvwrapper has been installed for
VIRTUALENVWRAPPER_PYTHON=/usr/bin/python and that PATH is
set properly.
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4. Cause Analysis

VIRTUALENVWRAPPER_PYTHON=/usr/bin/python and that PATH is set properly.Judging from the sentence of the error message , it is python2the path pointed to by the environment, so we only need to modify the path to which the environment variable is changed python3.

5. Solution

   1. Open configuration file

vim ~/.bash_profile
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2.  在配置文件中添加一行代码
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export VIRTUALENVWRAPPER_PYTHON=/usr/local/bin/python3
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3.  让配置生效, 大功告成
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source ~/.bash_profile
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4. Use commands that work in the terminal

1. Create a virtual environment to the configured WORKON_HOME path

 选取默认Python环境创建虚拟环境：
-- mkvirtualenv 虚拟环境名称
 基于某Python环境创建虚拟环境：
-- mkvirtualenv -p python2.7 虚拟环境名称
-- mkvirtualenv -p python3.6 虚拟环境名称
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2. View the existing virtual environment

-- workon
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3. Use a virtual environment

-- workon 虚拟环境名称
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4. Enter | Exit the Python environment of the virtual environment

-- python | exit()
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5. Install modules for the virtual environment

-- pip或pip3 install 模块名
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6. Exit the current virtual environment

-- deactivate
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7. Delete the virtual environment (exit first to delete the current virtual environment)

-- rmvirtualenv 虚拟环境名称
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Refer to this link for testing and basic instructions (but I failed this installation configuration environment) and then create a test virtualenv directory:

mkdir testvirtual
cd testvirtual
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You can successfully create a virtual environment env1: virtualenv env1

Next, create a folder to store all virtual environments

mkdir ~/workspaces
cd ~/workspaces
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Next, create one or more virtual environments env1: mkvirtualenv env1 After success, there will be (env1) in front of the current path 1. List the virtual environment:

$ lsvirtualenv -b
env1
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2. Switch the virtual environment

workon env1
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