Description of problem:
due to missing dependency on python-argparse ipython fails to start with this exception:

[root@hp-bl460cg1-01 ~]# ipython 
Traceback (most recent call last):
  File "/usr/bin/ipython", line 5, in <module>
    from IPython.frontend.terminal.ipapp import launch_new_instance
  File "/usr/lib/python2.6/site-packages/IPython/__init__.py", line 43, in <module>
    from .config.loader import Config
  File "/usr/lib/python2.6/site-packages/IPython/config/__init__.py", line 16, in <module>
    from .application import *
  File "/usr/lib/python2.6/site-packages/IPython/config/application.py", line 31, in <module>
    from IPython.config.configurable import SingletonConfigurable
  File "/usr/lib/python2.6/site-packages/IPython/config/configurable.py", line 26, in <module>
    from loader import Config
  File "/usr/lib/python2.6/site-packages/IPython/config/loader.py", line 26, in <module>
    from IPython.external import argparse
  File "/usr/lib/python2.6/site-packages/IPython/external/argparse/__init__.py", line 10, in <module>
    from _argparse import *
ImportError: No module named _argparse
[root@hp-bl460cg1-01 ~]# 


Version-Release number of selected component (if applicable):
python-ipython-0.13.2-5.el6.noarch

How reproducible:
always