upstream/ipython Files · IPython/core/tests/refbug.py

protect flush_figures post-exec function from user error...

protect flush_figures post-exec function from user error Invalid matplotlib data may raise inside print_figure. flush_figures() is a post-exec function, so user errors should not raise. Instead, call get_ipython().showtraceback() if called from IPython, raising as before otherwise.

Thomas Kluyver - - Load All Authors

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             refbug.py
        
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      """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

      #-----------------------------------------------------------------------------

      import sys

      from IPython.core import ipapi

      #-----------------------------------------------------------------------------

      # 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 = ipapi.get()

          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()

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				"""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
				#-----------------------------------------------------------------------------
				import sys

				from IPython.core import ipapi

				#-----------------------------------------------------------------------------
				# 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 = ipapi.get()

				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()