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"""Minimal script to reproduce our nasty reference counting bug.
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The problem is related to https://github.com/ipython/ipython/issues/141
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The original fix for that appeared to work, but John D. Hunter found a
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matplotlib example which, when run twice in a row, would break. The problem
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were references held by open figures to internals of Tkinter.
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This code reproduces the problem that John saw, without matplotlib.
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This script is meant to be called by other parts of the test suite that call it
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via %run as if it were executed interactively by the user. As of 2011-05-29,
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test_run.py calls it.
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"""
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from __future__ import print_function
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#-----------------------------------------------------------------------------
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# Module imports
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#-----------------------------------------------------------------------------
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import sys
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from IPython import get_ipython
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#-----------------------------------------------------------------------------
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# Globals
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#-----------------------------------------------------------------------------
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# This needs to be here because nose and other test runners will import
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# this module. Importing this module has potential side effects that we
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# want to prevent.
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if __name__ == '__main__':
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ip = get_ipython()
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if not '_refbug_cache' in ip.user_ns:
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ip.user_ns['_refbug_cache'] = []
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aglobal = 'Hello'
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def f():
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return aglobal
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cache = ip.user_ns['_refbug_cache']
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cache.append(f)
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def call_f():
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for func in cache:
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print('lowercased:',func().lower())
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