CentOS误删 ython2.7，不能使用yum，从新安装python

借鉴博客：

https://blog.csdn.net/qq_36653942/article/details/80712088

场景：

    误删usr/lib/python包，不能使用yum。

    主机版本：7.4.1708

建立目录python和yum用以存放rpm包：

备注：到http://vault.centos.org/7.4.1708/os/x86_64/Packages下找到对应版本

7.4.1708：为centos版本号，

使用指令查看主机对应版本号：cat /etc/redhat-release

 

#mkdir /usr/local/python
cd /usr/local/python 
wget http://vault.centos.org/7.4.1708/os/x86_64/Packages/python-2.7.5-58.el7.x86_64.rpm
wget http://vault.centos.org/7.4.1708/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
wget http://vault.centos.org/7.4.1708/os/x86_64/Packages/python-pycurl-7.19.0-19.el7.x86_64.rpm
wget http://vault.centos.org/7.4.1708/os/x86_64/Packages/python-devel-2.7.5-58.el7.x86_64.rpm
wget http://vault.centos.org/7.4.1708/os/x86_64/Packages/python-libs-2.7.5-58.el7.x86_64.rpm
wget http://vault.centos.org/7.4.1708/os/x86_64/Packages/python-urlgrabber-3.10-8.el7.noarch.rpm
wget http://vault.centos.org/7.4.1708/os/x86_64/Packages/rpm-python-4.11.3-25.el7.x86_64.rpm

#强制执行安装
rpm -ivh python-*   rpm-python-*
若是：
出现安装包的依赖问题，此时以下解决便可：
pm -ivh python-*   rpm-python-* --nodeps --force
#--nodeps --force为不考虑依赖包，强制安装。
#使用python指令 ，验证安装结果。

#mkdir /usr/local/yum
cd /usr/local/yum
wget http://vault.centos.org/7.4.1708/os/x86_64/Packages/yum-3.4.3-154.el7.centos.noarch.rpm
wget http://vault.centos.org/7.4.1708/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
wget http://vault.centos.org/7.4.1708/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-42.el7.noarch.rpm

#rpm -ivh yum-* 

#yum指令测试

##python3.6安装教程

1.首先下载须要安装的python版本：本次使用python-3.6.3

2.mkdir /usr/local/python3

3.解压python-3.6.3.tar至python3文件夹
tar -zxvf python-3.6.3.tar -C /usr/local/python3
4.安装依赖--tkinter，bz2库
python须要tkinter
yum -y install tkinter tcl-devel tk-devel
python须要bz2库
yum install bzip2-devel

5.进入解压后的python源文件，使用make指令
./configure --prefix=/usr/local/python3  #指定安装目录
make
make install

6.最后创建软链接
n -s /usr/local/python3/bin/python3 /usr/bin/python3
ln -s /usr/local/python3/bin/pip3 /usr/bin/pip3

7.测试安装结果
>>python3
>>pip3