检查第三方库是否正确安装

humanlsj@humanlsj-PC:~$ python
Python 2.7.16 (default, Feb 26 2021, 06:12:30) 
[GCC 8.3.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> 
humanlsj@humanlsj-PC:~$ python3
Python 3.7.3 (default, Apr  2 2021, 05:20:44) 
[GCC 8.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> 
humanlsj@humanlsj-PC:~$ python3 -c "import paramiko" #python3没有安装这个库
Traceback (most recent call last):
  File "", line 1, in
ModuleNotFoundError: No module named 'paramiko'
humanlsj@humanlsj-PC:~$ python -c "import paramiko" #python 有安装这个库
humanlsj@humanlsj-PC:~$