第一步：下载python2.7相关版本源码（例如：Python-2.18.4.tgz）

地址:https://www.python.org/downloads/release/python-2718/

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第二步：安装

1） 解压

tar zxvf Python-2.7.18.tar.tgz

2）进入文件夹：

cd Python-2.7.18

3）执行安装步骤：
要先检查环境

gcc --version
#若不存在进行安装
apt-get install gcc
gcc (Debian 12.2.0-3) 12.2.0
Copyright (C) 2022 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
g++ --version 
#若不存在进行安装
apt-get install g++
g++ (Debian 12.2.0-3) 12.2.0
Copyright (C) 2022 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

然后执行安装命令:

./configure

  make

 make install

4）检查是否安装成功

在命令行下输入python，出现以下显示结果即为成功。

python
Python 2.7.18 (default, Nov  2 2022, 15:29:52)
[GCC 12.2.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>

bash: pip3: command not found

问题描述：

当使用命令pip3 install XXX， 出现错误bash: pip3: command not found 错误原因：pip3还没有安装

解决方法：

安装 pip3

sudo apt install python3-pip

直接使用apt-get安装

apt-get install python2