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Backport PR #8829: Qt5 fix...
Backport PR #8829: Qt5 fix Fix for issue #8757. The problem was that IPython.external.qt was moved to qtconsole.qt, but IPython.external.qt_for_kernel was still trying to import IPython.external.qt. Rather than copying the qt.py file back to external, this PR merges the logic back into qt_for_kernel.py. Deferring to qt.py was a bit silly because both qt.py and qt_for_kernel.py do basically the same thing but in slightly different ways. Moreover, the assumption of qt.py was that if the QT_API environment variable is set, it must be in an ETS environment and need to comply by the ETS import logic. This is not valid, as ipython sets the QT_API environment variable to communicate intent as to Qt version, in `IPython/lib/inputhook.py:385` ...

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show_refs.py
20 lines | 393 B | text/x-python | PythonLexer
"""Simple script to show reference holding behavior.
This is used by a companion test case.
"""
from __future__ import print_function
import gc
class C(object):
def __del__(self):
pass
#print 'deleting object...' # dbg
if __name__ == '__main__':
c = C()
c_refs = gc.get_referrers(c)
ref_ids = list(map(id,c_refs))
print('c referrers:',list(map(type,c_refs)))