1.cd Python-3.12.0

2.sudo ./configure prefix=/usr/local/python3.12 --with-openssl=/usr --enable-optimizations

3.make -j$(nproc)
提示：The necessary bits to build these optional modules were not found:
_dbm
To find the necessary bits, look in configure.ac and config.log.

Checked 111 modules (31 built-in, 78 shared, 1 n/a on linux-x86_64, 0 disabled, 1 missing, 0 failed on import)
make[1]: 离开目录“/home/pho/Downloads/Python-3.12.0”

4.sudo make

5.sudo make install
提示：Installing collected packages: pip
WARNING: The scripts pip3 and pip3.12 are installed in '/usr/local/python3.12/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 pip-23.2.1
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

6.sudo ln -s /usr/local/python3.12/bin/python3.12 /usr/bin/python3
提示：ln: 无法创建符号链接'/usr/bin/python3': 文件已存在

7.sudo rm -rf /usr/bin/python3

8.sudo ln -s /usr/local/python3.12/bin/python3.12 /usr/bin/python3

9.ln -s /usr/local/python3.12/bin/pip3.12 /usr/bin/pip3
提示：无法创建符号链接'/usr/bin/pip3': 文件已存在

10.sudo rm -rf /usr/bin/pip3

11.sudo ln -s /usr/local/python3.12/bin/pip3.12 /usr/bin/pip3

12.vi ~/.bash_profile

按照网上的说法，将以下两行加入进入：

export PYTHON_HOME=/root/training/Python-3.12.0

export PATH=PYTHON_HOME/bin:PATH

就是这样：

退出后在终端输入：source~/.bash_profile。

提示：bash: source~/.bash_profile: 没有那个文件或目录。

又按照网上的说法，进行第13步。

13.sudo vi ~/.bashrc

在最下方加入：

export PATH="/path/to/python3.12/bin:$PATH

如下图：

保存退出。

14.source ~/.bashrc

15.输入python：默认的还是python2.6.7

最后我是这样做的：

————————————————

然后我在终端输入python，就是如下结果了：