[TroubleShooting]CentOS8使用pyenv部署多版本python时报 python: command not found

Posted 2022-01-02 白-胖-子

pyenv部署python报错的troubleshooting

pyenv: python :command not found

• 在CentOS8中成功部署pyenv后，安装多版本python也成功。
• 但是当在项目文件夹中设定python版本，创建虚拟python时始终不成功
• 始终报错-bash: python: command not found

[python@C8-196 ~]$ cd projects/web36
[python@C8-196 web36]$ pyenv local 
3.6.15
[python@C8-196 web36]$ pyenv versions
  system
  3.10.0
* 3.6.15 (set by /home/python/projects/web36/.python-version)
  3.6.15/envs/py3615
  3.8.12
  py3615
[python@C8-196 web36]$ python -V
-bash: python: command not found
[python@C8-196 web36]$ python3 -V
Python 3.6.8
[python@C8-196 web36]$ python3.6 -V
Python 3.6.8

重新部署

• 初始化虚拟机，重新一步一步部署，问题依然重现

检查pyenv install python是否成功

• 进入安装目录查看，并执行程序,证明程序安装的没问

[python@C8-196 web36]$ ~/.pyenv/versions/3.6.15/bin/python -V
Python 3.6.15

思考问题原因

• 根据以往经验，command not found如果不是程序没装好，那就肯定是环境变量除了问题
• 之前在CentOS 7配置的环境变量方法

vim  ~/.bashrc

export PATH="/home/python/.pyenv/bin:$PATH"
eval "$(pyenv init -)"
eval "$(pyenv virtualenv-init -)"

source ~/.bashrc

解决问题

• 既然在配置环境变量上出了问题，就要去官网查看详细的文档说明
  

• 官网在帮助中写的清清楚楚明明白白，那就按照官网上面来

[python@C8-196 ~]$ sed -Ei -e '/^([^#]|$)/ a \\
> export PYENV_ROOT="$HOME/.pyenv"
> a \\
> export PATH="$PYENV_ROOT/bin:$PATH"
> a \\
> ' -e ':a' -e '$!n;ba;' ~/.bash_profile
[python@C8-196 ~]$ echo 'eval "$(pyenv init --path)"' >> ~/.bash_profile
[python@C8-196 ~]$ 
[python@C8-196 ~]$ echo 'export PYENV_ROOT="$HOME/.pyenv"' >> ~/.profile
[python@C8-196 ~]$ echo 'export PATH="$PYENV_ROOT/bin:$PATH"' >> ~/.profile
[python@C8-196 ~]$ echo 'eval "$(pyenv init --path)"' >> ~/.profile
[python@C8-196 ~]$ 
[python@C8-196 ~]$ echo 'eval "$(pyenv init -)"' >> ~/.bashrc
[python@C8-196 ~]$ source ~/.bashrc

• 真是立竿见影，药到病除

[root@C8-196 ~]# su - python
Last login: Thu Dec  9 19:26:13 CST 2021 on pts/0
[python@C8-196 ~]$ cd projects/web36
[python@C8-196 web36]$ pyenv versions
  system
  3.10.0
* 3.6.15 (set by /home/python/projects/web36/.python-version)
  3.6.15/envs/py3615
  3.6.15/envs/venv
  3.8.12
  py3615
  venv
[python@C8-196 web36]$ python -V
Python 3.6.15
[python@C8-196 web36]$ pip -V
pip 18.1 from /home/python/.pyenv/versions/3.6.15/lib/python3.6/site-packages/pip (python 3.6)

总结

• 出了问题，尽量去官网招解决方案，网上的不一定靠谱