Linux?系统为?CentOS Linux release 7.4.1708

手贱、手贱、手贱?删了python?导致yum不可用。百度一大圈，重装yum和python后，老是报各种各样的错。历经磨难，终于自己总结了一套，亲测可用，分享一下。

1. 首先卸载现有python
   1. ?
      rpm -qa|grep python|xargs rpm -ev --allmatches --nodeps #卸载python
   2. ?
      whereis python |xargs rm -frv ##删除所有残余文件
   3. ?
      whereis python ##验证删除，返回无结果

   ?

2. ?删除现有的yum
   1. ?
      rpm -qa|grep yum|xargs rpm -ev --allmatches --nodeps #删除yum
   2. ?
      whereis yum |xargs rm -frv #删除残留文件
   3. ?
      whereis yum #验证删除完成

3. 找到下载文件源
   首先在这里找到服务器对应的版本，如 7.4.1708 进入这里目录?找到对应版本的rpm，替换下面的文件。

4. 下载并安装，注意顺序，先安装python?然后?yum。不然安装后还会报错，重新来一遍。

   1. ?
      # python安装
   2. ?
      rpm -ivh --nodeps http: //vault.centos.org/7.4.1708/os/x86_64/Packages/python-2.7.5-58.el7.x86_64.rpm
   3. ?
      rpm -ivh --nodeps http: //vault.centos.org/7.4.1708/os/x86_64/Packages/python-devel-2.7.5-58.el7.x86_64.rpm
   4. ?
      rpm -ivh --nodeps http: //vault.centos.org/7.4.1708/os/x86_64/Packages/python-iniparse-0.4-9.el7.noarch.rpm
   5. ?
      rpm -ivh --nodeps http: //vault.centos.org/7.4.1708/os/x86_64/Packages/python-libs-2.7.5-58.el7.x86_64.rpm
   6. ?
      rpm -ivh --nodeps http: //vault.centos.org/7.4.1708/os/x86_64/Packages/python-pycurl-7.19.0-19.el7.x86_64.rpm
   7. ?
      rpm -ivh --nodeps http: //vault.centos.org/7.4.1708/os/x86_64/Packages/python-urlgrabber-3.10-8.el7.noarch.rpm
   8. ?
      rpm -ivh --nodeps http: //vault.centos.org/7.4.1708/os/x86_64/Packages/rpm-python-4.11.3-25.el7.x86_64.rpm
   9. ?
      ?
   10. ?
       # yum安装
   11. ?
       rpm -ivh --nodeps http: //vault.centos.org/7.4.1708/os/x86_64/Packages/yum-3.4.3-154.el7.centos.noarch.rpm
   12. ?
       rpm -ivh --nodeps http: //vault.centos.org/7.4.1708/os/x86_64/Packages/yum-metadata-parser-1.1.4-10.el7.x86_64.rpm
   13. ?
       rpm -ivh --nodeps http: //vault.centos.org/7.4.1708/os/x86_64/Packages/yum-plugin-fastestmirror-1.1.31-42.el7.noarch.rpm

5. 验证?

   1. ?
      #验证python
   2. ?
      python
   3. ?
      #验证yum
   4. ?
      yum