No module named pycurl(无法使用yum和pip的情况下的解决方案)

云服务器上碰到的问题,版本是:

CentOS Linux release 7.4.1708 (Core)

稍微讲下怎么回事,听网上说,yum是python写的

输入命令:yum update

报错如下:

There was a problem importing one of the Python modules
required to run yum. The error leading to this problem was:

   No module named pycurl

Please install a package which provides this module, or
verify that the module is installed correctly.

It's possible that the above module doesn't match the
current version of Python, which is:
2.7.5 (default, Aug  4 2017, 00:39:18) 

[GCC 4.8.5 20150623 (Red Hat 4.8.5-16)]

If you cannot solve this problem yourself, please go to 
the yum faq at:

  http://yum.baseurl.org/wiki/Faq

解决方案是以下两个的整合(把以下两个改完,才能最终解决这个问题)

一 

vi /usr/bin/yum

把

#!/usr/bin/python
修改成
#!/usr/bin/python2

二

http://blog.csdn.net/appleyuchi/article/details/78954403