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refbug.py

"""Minimal script to reproduce our nasty reference counting bug.

The problem is related to https://github.com/ipython/ipython/issues/141

The original fix for that appeared to work, but John D. Hunter found a
matplotlib example which, when run twice in a row, would break.  The problem
were references held by open figures to internals of Tkinter.

This code reproduces the problem that John saw, without matplotlib.

This script is meant to be called by other parts of the test suite that call it
via %run as if it were executed interactively by the user. As of 2011-05-29,
test_run.py calls it.
"""

#-----------------------------------------------------------------------------
# Module imports
#-----------------------------------------------------------------------------

from IPython import get_ipython

#-----------------------------------------------------------------------------
# Globals
#-----------------------------------------------------------------------------

# This needs to be here because nose and other test runners will import
# this module. Importing this module has potential side effects that we
# want to prevent.
if __name__ == '__main__':

ip = get_ipython()

if not '_refbug_cache' in ip.user_ns:
        ip.user_ns['_refbug_cache'] = []

aglobal = 'Hello'
    def f():
        return aglobal

cache = ip.user_ns['_refbug_cache']
    cache.append(f)

def call_f():
        for func in cache:
            print('lowercased:',func().lower())

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-01-07 04:51:34
..	dir	-	root/root	0755	2025-01-07 04:51:34
__pycache__	dir	-	root/root	0755	2025-01-07 04:51:34
daft_extension	dir	-	root/root	0755	2025-01-07 04:51:34
2x2.jpg	image/jpeg	331 B	root/root	0644	2025-01-06 04:11:20
2x2.png	image/png	71 B	root/root	0644	2025-01-06 04:11:20
__init__.py	application/x-empty	0 B	root/root	0644	2025-01-06 04:11:20
bad_all.py	text/plain	206 B	root/root	0644	2025-01-06 04:11:20
nonascii.py	text/plain	135 B	root/root	0644	2025-01-06 04:11:20
nonascii2.py	text/plain	155 B	root/root	0644	2025-01-06 04:11:20
print_argv.py	text/plain	32 B	root/root	0644	2025-01-06 04:11:20
refbug.py	text/plain	1.46 KB	root/root	0644	2025-01-06 04:11:20
simpleerr.py	text/plain	583 B	root/root	0644	2025-01-06 04:11:20
tclass.py	text/plain	921 B	root/root	0644	2025-01-06 04:11:20
test_alias.py	text/x-python	1.96 KB	root/root	0644	2025-01-06 04:11:20
test_application.py	text/x-python	2.19 KB	root/root	0644	2025-01-06 04:11:20
test_async_helpers.py	text/plain	8.44 KB	root/root	0644	2025-01-06 04:11:20
test_autocall.py	text/plain	1.39 KB	root/root	0644	2025-01-06 04:11:20
test_compilerop.py	text/x-python	2.12 KB	root/root	0644	2025-01-06 04:11:20
test_completer.py	text/x-python	59.38 KB	root/root	0644	2025-01-06 04:11:20
test_completerlib.py	text/x-python	6.35 KB	root/root	0644	2025-01-06 04:11:20
test_debugger.py	text/plain	14.16 KB	root/root	0644	2025-01-06 04:11:20
test_display.py	text/x-python	15.57 KB	root/root	0644	2025-01-06 04:11:20
test_displayhook.py	text/x-python	3.51 KB	root/root	0644	2025-01-06 04:11:20
test_events.py	text/x-python	2.23 KB	root/root	0644	2025-01-06 04:11:20
test_exceptiongroup_tb.py	text/x-python	3.51 KB	root/root	0644	2025-01-06 04:11:20
test_extension.py	text/x-python	2.96 KB	root/root	0644	2025-01-06 04:11:20
test_formatters.py	text/plain	13.92 KB	root/root	0644	2025-01-06 04:11:20
test_guarded_eval.py	text/x-python	15.29 KB	root/root	0644	2025-01-06 04:11:20
test_handlers.py	text/plain	3.21 KB	root/root	0644	2025-01-06 04:11:20
test_history.py	text/x-python	11.42 KB	root/root	0644	2025-01-06 04:11:20
test_hooks.py	text/x-python	2.26 KB	root/root	0644	2025-01-06 04:11:20
test_imports.py	text/x-python	1.13 KB	root/root	0644	2025-01-06 04:11:20
test_inputsplitter.py	text/x-python	22.67 KB	root/root	0644	2025-01-06 04:11:20
test_inputtransformer.py	text/x-python	15.39 KB	root/root	0644	2025-01-06 04:11:20
test_inputtransformer2.py	text/plain	11.14 KB	root/root	0644	2025-01-06 04:11:20
test_inputtransformer2_line.py	text/plain	2.9 KB	root/root	0644	2025-01-06 04:11:20
test_interactiveshell.py	text/x-python	38.73 KB	root/root	0644	2025-01-06 04:11:20
test_iplib.py	text/plain	6.52 KB	root/root	0644	2025-01-06 04:11:20
test_logger.py	text/x-python	776 B	root/root	0644	2025-01-06 04:11:20
test_magic.py	text/x-python	43.32 KB	root/root	0644	2025-01-06 04:11:20
test_magic_arguments.py	text/x-python	4.67 KB	root/root	0644	2025-01-06 04:11:20
test_magic_terminal.py	text/plain	5.86 KB	root/root	0644	2025-01-06 04:11:20
test_oinspect.py	text/plain	15.31 KB	root/root	0644	2025-01-06 04:11:20
test_page.py	text/x-python	772 B	root/root	0644	2025-01-06 04:11:20
test_paths.py	text/x-python	6.92 KB	root/root	0644	2025-01-06 04:11:20
test_prefilter.py	text/plain	4.12 KB	root/root	0644	2025-01-06 04:11:20
test_profile.py	text/x-python	4.95 KB	root/root	0644	2025-01-06 04:11:20
test_prompts.py	text/x-python	845 B	root/root	0644	2025-01-06 04:11:20
test_pylabtools.py	text/plain	7.7 KB	root/root	0644	2025-01-06 04:11:20
test_run.py	text/x-python	18.92 KB	root/root	0644	2025-01-06 04:11:20
test_shellapp.py	text/x-python	1.85 KB	root/root	0644	2025-01-06 04:11:20
test_splitinput.py	text/x-python	1.2 KB	root/root	0644	2025-01-06 04:11:20
test_ultratb.py	text/x-python	11.74 KB	root/root	0644	2025-01-06 04:11:20