virtualenv管理py环境linux版

因为服务器上已经安装了python3，所以直接安装virtualenv即可

pip3 install virtualenv -i https://mirrors.aliyun.com/pypi/simple/

查找此包安装在什么地方

[root@172 edu-manage]# 
[root@172 edu-manage]# virtualenv -help
bash: virtualenv: command not found
[root@172 edu-manage]# whereis virtualenv
virtualenv: /opt/python37/bin/virtualenv
[root@172 edu-manage]# 

建立软链，方便使用

[root@172 bin]# ln -s /opt/python37/bin/virtualenv /usr/bin/virtualenv

创建虚拟环境

$ virtualenv  [OPTIONS]  [虚拟环境名称]
#顺序都可以
 virtualenv -p /usr/bin/python3.6 ENV
 virtualenv -p /usr/bin/python3.6 ENV
 virtualenv  ENV --python=python3.6
 virtualenv  --python=python3.6 ENV 

[root@172 ~]# whereis python3
python3: /usr/bin/python3 /opt/python37/bin/python3.7m /opt/python37/bin/python3.7 /opt/python37/bin/python3.7m-config /opt/python37/bin/python3 /opt/python37/bin/python3.7-config
[root@172 ~]#
[root@172 ~]# virtualenv -p /usr/bin/python3 export_data
created virtual environment CPython3.7.5.final.0-64 in 391ms
  creator CPython3Posix(dest=/root/export_data, clear=False, no_vcs_ignore=False, global=False)
  seeder FromAppData(download=False, pip=bundle, setuptools=bundle, wheel=bundle, via=copy, app_data_dir=/root/.local/share/virtualenv)
    added seed packages: pip==21.3.1, setuptools==58.3.0, wheel==0.37.0
  activators BashActivator,CShellActivator,FishActivator,NushellActivator,PowerShellActivator,PythonActivator
[root@172 ~]# 
[root@172 ~]#

创建的虚拟环境是不会把原始解释器所在的环境下的包带过来的

进入虚拟环境&退出

[root@172 ~]# cd export_data/
[root@172 export_data]# ls
bin  lib  pyvenv.cfg
[root@172 export_data]# 
[root@172 export_data]# 
[root@172 export_data]# cd bin/
[root@172 bin]# ls
activate       activate.nu       deactivate.nu  pip-3.7  python3    wheel3
activate.csh   activate.ps1      pip            pip3.7   python3.7  wheel-3.7
activate.fish  activate_this.py  pip3           python   wheel      wheel3.7
[root@172 bin]# 
# 进入环境
[root@172 bin]# source activate
(export_data) [root@172 bin]# 
(export_data) [root@172 bin]# 
# 退出环境
(export_data) [root@172 bin]# deactivate
[root@172 bin]#