参考这里
[tst@dev:test]$ virtualenv --no-site-packages bvenv
usage: virtualenv [--version] [--with-traceback] [-v | -q] [--read-only-app-data] [--app-data APP_DATA] [--reset-app-data] [--upgrade-embed-wheels] [--discovery {builtin}] [-p py] [--try-first-with py_exe]
[--creator {builtin,cpython3-posix,venv}] [--seeder {app-data,pip}] [--no-seed] [--activators comma_sep_list] [--clear] [--no-vcs-ignore] [--system-site-packages] [--symlinks | --copies] [--no-download | --download]
[--extra-search-dir d [d ...]] [--pip version] [--setuptools version] [--wheel version] [--no-pip] [--no-setuptools] [--no-wheel] [--no-periodic-update] [--symlink-app-data] [--prompt prompt] [-h]
dest
virtualenv: error: unrecognized arguments: --no-site-packages
SystemExit: 2
1. 使用virtualenv --version，看到自己的版本大于20，就可以将如下这段删除：
export VIRTUALENVWRAPPER_VIRTUALENV_ARGS='--no-site-packages'
因为从版本20开始，默认就是’--no-site-packages‘了。
2. 重新source一下bashrc文件；
3. 重启shell，然后就可以正常工作了。
4. 如上所示，进入虚拟环境了，查看一下环境情况： pip list
5. 好了，大功告成！
根据提示，仔细察看了下virtualenv的版本，果然是超过20的
[tst@dev:test]$ virtualenv --version
virtualenv 20.23.1 from /usr/local/lib/python3.8/dist-packages/virtualenv/__init__.py
创建virtual env：名称为tst_venv
[tst@dev:test]$ virtualenv tst_venv
created virtual environment CPython3.8.10.final.0-64 in 1457ms
creator CPython3Posix(dest=/home/tst/tst_venv, clear=False, no_vcs_ignore=False, global=False)
seeder FromAppData(download=False, pip=bundle, setuptools=bundle, wheel=bundle, via=copy, app_data_dir=/home/tst/.local/share/virtualenv)
added seed packages: pip==23.1.2, setuptools==67.8.0, wheel==0.40.0
activators BashActivator,CShellActivator,FishActivator,NushellActivator,PowerShellActivator,PythonActivator
此时直接执行pip list,发现结果是系统安装的，并不是当前虚拟环境的：
[tst@dev:test]$ pip list
Package Version
---------------------- --------------------
attrs 19.3.0
Automat 0.8.0
blinker 1.4
certifi 2019.11.28
chardet 3.0.4
Click 7.0
cloud-init 23.1.2
colorama 0.4.3
command-not-found 0.3
[tst@dev:test]$ source tst_venv/bin/
activate activate.nu pip pip3.8 python3.8 wheel-3.8
activate.csh activate.ps1 pip3 python wheel wheel3.8
activate.fish activate_this.py pip-3.8 python3 wheel3
[tst@dev:test]$ source tst_venv/bin/activate
(tst_venv) [tst@dev:test]$ pip list
Package Version
---------- -------
pip 23.1.2
setuptools 67.8.0
wheel 0.40.0
deactive退出当前virtual env:
(tst_venv) [tst@dev:test]$ deactivate
[tst@dev:test]$
