$ python test.py
/usr/lib/python2.7/dist-packages/IPython/utils/path.py:292: UserWarning: IPython parent '/home/culebron' is not a writable location, using a temp directory.
  " using a temp directory."%parent)
Traceback (most recent call last):
  File "test.py", line 13, in <module>
    test()
  File "/usr/local/lib/python2.7/dist-packages/mock.py", line 1190, in patched
    return func(*args, **keywargs)
  File "test.py", line 10, in test
    import ipdb; ipdb.set_trace()
  File "/usr/local/lib/python2.7/dist-packages/ipdb/__init__.py", line 1, in <module>
    from __main__ import set_trace, post_mortem, pm
  File "/usr/local/lib/python2.7/dist-packages/ipdb/__main__.py", line 19, in <module>
    ipshell = InteractiveShellEmbed()
  File "/usr/lib/python2.7/dist-packages/IPython/frontend/terminal/embed.py", line 88, in __init__
    display_banner=display_banner
  File "/usr/lib/python2.7/dist-packages/IPython/frontend/terminal/interactiveshell.py", line 183, in __init__
    user_module=user_module, custom_exceptions=custom_exceptions
  File "/usr/lib/python2.7/dist-packages/IPython/core/interactiveshell.py", line 410, in __init__
    self.init_ipython_dir(ipython_dir)
  File "/usr/lib/python2.7/dist-packages/IPython/core/interactiveshell.py", line 523, in init_ipython_dir
    self.ipython_dir = get_ipython_dir()
  File "/usr/lib/python2.7/dist-packages/IPython/utils/traitlets.py", line 307, in __set__
    obj._notify_trait(self.name, old_value, new_value)
  File "/usr/lib/python2.7/dist-packages/IPython/utils/traitlets.py", line 456, in _notify_trait
    c(name, new_value)
  File "/usr/lib/python2.7/dist-packages/IPython/core/interactiveshell.py", line 497, in _ipython_dir_changed
    os.makedirs(new, mode = 0777)
  File "/usr/lib/python2.7/os.py", line 157, in makedirs
    mkdir(name, mode)
OSError: [Errno 17] File exists: '/tmp/tmpPwyFxX'