正在~/.local文件夹中安装pip3程序包

我最近升级到了ubuntu 20.04 LTS。由于预先安装了

python3.8

，我使用命令

sudo-apt-install-python3-pip

安装了pip，并开始安装python3库。我安装的所有库都将安装到

~/.local/lib/Python3.8/site packages

文件夹中。如果我没记错的话，这些包应该安装到

/usr/local/lib/python3.8/dist包中

madhan@madhan:~$ pip3 show tensorflow
Name: tensorflow
Version: 2.2.0
Summary: TensorFlow is an open source machine learning framework for everyone.
Home-page: https://www.tensorflow.org/
Author: Google Inc.
Author-email: packages@tensorflow.org
License: Apache 2.0
Location: /home/madhan/.local/lib/python3.8/site-packages

安装软件包后，我得到一个警告说~/.local/bin不包括在$PATH变量中

Installing collected packages: appdirs, cachelib, pygments, cssselect, lxml, pyquery, howdoi
  WARNING: The script pygmentize is installed in '/home/madhan/.local/bin' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
  WARNING: The script howdoi is installed in '/home/madhan/.local/bin' which is not on PATH.
  Consider adding this directory to PATH or, if you prefer to suppress this warning, use --no-warn-script-location.
Successfully installed appdirs-1.4.4 cachelib-0.1 cssselect-1.1.0 howdoi-1.2.1 lxml-4.5.1 pygments-2.6.1 pyquery-1.4.1

即使$PATH变量中不包含~/.local/bin，我仍然可以导入包

madhan@madhan:~$ python3
Python 3.8.2 (default, Apr 27 2020, 15:53:34) 
[GCC 9.3.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import tensorflow
>>> 

有人知道为什么会这样吗？如何更改安装pip3软件包的默认文件夹。将软件包保留在~/.local文件夹中可以吗？还是将来会有问题？
在local/lib中安装是正常的，您不是在使用conda吗