Python3 configure virtual environment virtualenv

1. Install virtualenv

pip install virtualenv virtualenvwrapper

2. Configuration file

Modify ~/.bash_profile or other environment variable related files (such as .bashrc or .zshrc after ZSH), and add the following statement:

export WORKON_HOME=$HOME/.virtualenvs
export PROJECT_HOME=$HOME/workspace
source /usr/local/bin/virtualenvwrapper.sh

* Note that the address of /usr/local/bin/virtualenvwrapper.sh should be determined according to the actual situation and should be used

find / -name virtualenvwrapper.sh

to determine the location of the modified file. For example my location is:
/usr/local/python3.5.2/bin/virtualenvwrapper.sh

3. Make the configuration file take effect

source ~/.bash_profile

** I have a problem here, that is, the error /usr/bin/python has no xxx. I saw that because my virtual machine is coexisting with Python 2 and Python 3, so he reported an error like this, it must be somewhere using Python 2 , so I'm sure that the file virtualenvwrapper.sh uses Python 2, so I went to this file and found this line

 VIRTUALENVWRAPPER_PYTHON="$(command \which python)"   

Obviously, such a code means to give Python's running address to this variable. So I changed it to

  VIRTUALENVWRAPPER_PYTHON="$(command \which python3)"

Later, an error was reported. Because the source ~/.bash_profile command has been executed before, the variable VIRTUALENVWRAPPER_PYTHON has been generated, so I delete the environment variable with the unset command. Just execute source ~/.bash_profile again.

Another problem arises. When executing the command mkvirtualenv to create a virtual environment, an error command not found is reported. To find a solution on Stack Overflow, add the following to the .bashrc configuration file:

export PATH=/usr/local/python3.5.2/bin:$PATH

**　Note that /usr/local/python3.5.2/bin is the python3 installation address.