一、背景：

        CentOS7.7上默认已经存在python2.7，但需要python3，所以计划源码安装python3。

        下载python3.10.8

        wget https://www.python.org/ftp/python/3.10.8/Python-3.10.8.tgz

二、编译安装

        安装用户为普通linux用户，拥有sudo权限

        tar -zxf Python-3.10.8.tgz

        cd Python-3.10.8.tgz

        ./configure --prefix=/usr/local/python3108

        sudo make && sudo make install

源码安装完成后，有一些warning信息。

三、检查可执行文件

        python3 -V

        pip3 -V执行报错，报错信息如下：
                Traceback (most recent call last):
                  File "/usr/local/python3108/bin/pip3", line 5, in <module>
                    from pip._internal.cli.main import main
                ModuleNotFoundError: No module named 'pip._internal'

四、考虑更新pip3

        执行python3 -m pip install --upgrade pip报错，报错信息如下：

                /usr/local/python3108/bin/python3: No module named pip.__main__; 'pip' is a package and cannot be directly executed

五、检查pip模块

        执行sudo /usr/local/python3108/bin/python3 -m ensurepip显示已存在相关包

                Looking in links: /tmp/tmp3pdc2q20
                Requirement already satisfied: setuptools in /usr/local/python3108/lib/python3.10/site-packages (63.2.0)
                Requirement already satisfied: pip in /usr/local/python3108/lib/python3.10/site-packages (22.2.2)
                WARNING: Running pip as the 'root' user can result in broken permissions and conflicting behaviour with the system package manager. It is recommended to use a virtual environment instead: https://pip.pypa.io/warnings/venv

六、检查目录权限

        发现/usr/local/python3108/lib/python3.10/site-packages子目录权限不对，普通用户无法调用。

七、再次检查python3和pip3可执行权限，

        sudo /usr/local/python3108/bin/python3 -V

        sudo /usr/local/python3108/bin/pip3 -V     

        使用sudo执行成功

八、确认python目录权限

        检查发现/usr/local/python3108/lib/python3.10目录下所有的子目录都需要调整。

九、建议

        建议使用root安装python3

        或者

        调用python3和pip3时，添加sudo

        sudo /usr/local/python3108/bin/python3 -V

        sudo /usr/local/python3108/bin/pip3 -V