You may get an error when you run yum update command. 

# yum update


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, Jun 17 2014, 18:11:42)

[GCC 4.8.2 20140120 (Red Hat 4.8.2-16)]



If you cannot solve this problem yourself, please go to

the yum faq at:

  http://yum.baseurl.org/wiki/Faq

Soluton:

Download the pycurl package using wget command and extract the file,
 
# wget https://pypi.python.org/packages/source/p/pycurl/pycurl-7.19.0.tar.gz

# tar -xf pycurl-7.19.0.tar.gz

# cd pycurl-7.19.0

execute the command,
 
# sudo python2.7 setup.py install


Using curl-config (libcurl 7.29.0)

running install

running build

running build_py

creating build

creating build/lib.linux-x86_64-2.7

.....

running install_egg_info

Removing /usr/lib64/python2.7/site-packages/pycurl-7.19.0-py2.7.egg-info

Writing /usr/lib64/python2.7/site-packages/pycurl-7.19.0-py2.7.egg-info

Now, you can execute the command yum update.

Error 2 :

Also i am getting another error when using yum command,
/usr/lib64/python2.7/site-packages/pycurl.so: undefined symbol: CRYPTO_num_locks

Recompile the Python same version.