After adding 'raise'

# vim /opt/epd-7.3-2-rh5-x86/lib/python2.7/site-packages/IPython/zmq/__init__.py +53
# ipython notebook
Traceback (most recent call last):
  File "/opt/epd-7.3-2-rh5-x86/bin/ipython", line 9, in <module>
    load_entry_point('ipython==0.13.2', 'console_scripts', 'ipython')()
  File "/opt/epd-7.3-2-rh5-x86/lib/python2.7/site-packages/IPython/frontend/terminal/ipapp.py", line 388, in launch_new_instance
    app.initialize()
  File "<string>", line 2, in initialize
  File "/opt/epd-7.3-2-rh5-x86/lib/python2.7/site-packages/IPython/config/application.py", line 84, in catch_config_error
    return method(app, *args, **kwargs)
  File "/opt/epd-7.3-2-rh5-x86/lib/python2.7/site-packages/IPython/frontend/terminal/ipapp.py", line 313, in initialize
    super(TerminalIPythonApp, self).initialize(argv)
  File "<string>", line 2, in initialize
  File "/opt/epd-7.3-2-rh5-x86/lib/python2.7/site-packages/IPython/config/application.py", line 84, in catch_config_error
    return method(app, *args, **kwargs)
  File "/opt/epd-7.3-2-rh5-x86/lib/python2.7/site-packages/IPython/core/application.py", line 325, in initialize
    self.parse_command_line(argv)
  File "/opt/epd-7.3-2-rh5-x86/lib/python2.7/site-packages/IPython/frontend/terminal/ipapp.py", line 308, in parse_command_line
    return super(TerminalIPythonApp, self).parse_command_line(argv)
  File "<string>", line 2, in parse_command_line
  File "/opt/epd-7.3-2-rh5-x86/lib/python2.7/site-packages/IPython/config/application.py", line 84, in catch_config_error
    return method(app, *args, **kwargs)
  File "/opt/epd-7.3-2-rh5-x86/lib/python2.7/site-packages/IPython/config/application.py", line 420, in parse_command_line
    return self.initialize_subcommand(subc, subargv)
  File "<string>", line 2, in initialize_subcommand
  File "/opt/epd-7.3-2-rh5-x86/lib/python2.7/site-packages/IPython/config/application.py", line 84, in catch_config_error
    return method(app, *args, **kwargs)
  File "/opt/epd-7.3-2-rh5-x86/lib/python2.7/site-packages/IPython/config/application.py", line 352, in initialize_subcommand
    subapp = import_item(subapp)
  File "/opt/epd-7.3-2-rh5-x86/lib/python2.7/site-packages/IPython/utils/importstring.py", line 40, in import_item
    module = __import__(package,fromlist=[obj])
  File "/opt/epd-7.3-2-rh5-x86/lib/python2.7/site-packages/IPython/frontend/html/notebook/__init__.py", line 18, in <module>
    from IPython.zmq import check_for_zmq
  File "/opt/epd-7.3-2-rh5-x86/lib/python2.7/site-packages/IPython/zmq/__init__.py", line 68, in <module>
    check_for_zmq('2.1.4')
  File "/opt/epd-7.3-2-rh5-x86/lib/python2.7/site-packages/IPython/zmq/__init__.py", line 51, in check_for_zmq
    import zmq
  File "/opt/epd-7.3-2-rh5-x86/lib/python2.7/site-packages/zmq/__init__.py", line 26, in <module>
    from zmq.utils import initthreads # initialize threads
ImportError: libzmq.so.1: cannot open shared object file: No such file or directory