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Merging -r 1177 from lp:ipython with fixes and resolutions....
Merging -r 1177 from lp:ipython with fixes and resolutions. The main conflicts I had to fix were in ultratb. I have removed the ultraTB.py in IPython/kernel/core. Now IPython/core/ultratb.py is being used everywhere. Also I have protected the calls to ipapi.get to see if None is returned. This happens when trial IPython.kernel is run.

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show_refs.py
18 lines | 303 B | text/x-python | PythonLexer
"""Simple script to show reference holding behavior.
This is used by a companion test case.
"""
import gc
class C(object):
def __del__(self):
pass
#print 'deleting object...' # dbg
c = C()
c_refs = gc.get_referrers(c)
ref_ids = map(id,c_refs)
print 'c referrers:',map(type,c_refs)