upstream/ipython Files · IPython/terminal/tests/test_debug_magic.py

Handle OSError cases where traceback frames occur from built files (#13964)...

Handle OSError cases where traceback frames occur from built files (#13964) I've been using the `_render_traceback_` method of the traceback object, provided by the `IPython.core.interactiveshell.InteractiveShell` object that you created, in the `showtraceback` method. Thanks to this, I was able to create better error messages. I appreciate it. The following issue is related to the use of this method. ```python try: # Exception classes can customise their traceback - we # use this in IPython.parallel for exceptions occurring # in the engines. This should return a list of strings. if hasattr(value, "_render_traceback_"): stb = value._render_traceback_() else: stb = self.InteractiveTB.structured_traceback( etype, value, tb, tb_offset=tb_offset ) ``` I noticed that in the recent `8.11` version, code was added to generate a traceback when the source code is too long. In this case, if the `etb.tb_frame` object is a built file or something similar, the `inspect.getsourcelines(etb.tb_frame)` method may raise an error. So I implemented a change to set the `max_len` to the minimum value and avoid the following condition when an `OSError` occurs. I think this approach can handle cases where errors occur while using the `inspect.getsourcelines()` method. If there is anything I have done wrong or any procedures I should follow, please let me know. I would greatly appreciate it if you could leave a comment and I will make the necessary changes immediately. Thank you.

Nikita Kniazev - - Load All Authors

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      """Test embedding of IPython"""

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

      #  Copyright (C) 2013 The IPython Development Team

      #

      #  Distributed under the terms of the BSD License.  The full license is in

      #  the file COPYING, distributed as part of this software.

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

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

      # Imports

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

      import os

      import sys

      from IPython.testing.decorators import skip_win32

      from IPython.testing import IPYTHON_TESTING_TIMEOUT_SCALE

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

      # Tests

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

      @skip_win32

      def test_debug_magic_passes_through_generators():

          """

          This test that we can correctly pass through frames of a generator post-mortem.

          """

          import pexpect

          import re

          in_prompt = re.compile(br'In ?\[\d+\]:')

          ipdb_prompt = 'ipdb>'

          env = os.environ.copy()

          child = pexpect.spawn(sys.executable, ['-m', 'IPython', '--colors=nocolor', '--simple-prompt'],

                                env=env)

          child.timeout = 15 * IPYTHON_TESTING_TIMEOUT_SCALE

          child.expect(in_prompt)

          child.timeout = 2 * IPYTHON_TESTING_TIMEOUT_SCALE

          child.sendline("def f(x):")

          child.sendline("    raise Exception")

          child.sendline("")

          child.expect(in_prompt)

          child.sendline("gen = (f(x) for x in [0])")

          child.sendline("")

          child.expect(in_prompt)

          child.sendline("for x in gen:")

          child.sendline("    pass")

          child.sendline("")

          child.timeout = 10 * IPYTHON_TESTING_TIMEOUT_SCALE

          child.expect('Exception:')

          child.expect(in_prompt)

          child.sendline(r'%debug')

          child.expect('----> 2     raise Exception')

          child.expect(ipdb_prompt)

          child.sendline('u')

          child.expect_exact(r'----> 1 gen = (f(x) for x in [0])')

          child.expect(ipdb_prompt)

          child.sendline('u')

          child.expect_exact('----> 1 for x in gen:')

          child.expect(ipdb_prompt)

          child.sendline('u')

          child.expect_exact('*** Oldest frame')

          child.expect(ipdb_prompt)

          child.sendline('exit')

          child.expect(in_prompt)

          child.sendline('exit')

          child.close()

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				"""Test embedding of IPython"""

				#-----------------------------------------------------------------------------
				# Copyright (C) 2013 The IPython Development Team
				#
				# Distributed under the terms of the BSD License. The full license is in
				# the file COPYING, distributed as part of this software.
				#-----------------------------------------------------------------------------

				#-----------------------------------------------------------------------------
				# Imports
				#-----------------------------------------------------------------------------

				import os
				import sys
				from IPython.testing.decorators import skip_win32
				from IPython.testing import IPYTHON_TESTING_TIMEOUT_SCALE

				#-----------------------------------------------------------------------------
				# Tests
				#-----------------------------------------------------------------------------

				@skip_win32
				def test_debug_magic_passes_through_generators():
				"""
				This test that we can correctly pass through frames of a generator post-mortem.
				"""
				import pexpect
				import re
				in_prompt = re.compile(br'In ?\[\d+\]:')
				ipdb_prompt = 'ipdb>'
				env = os.environ.copy()
				child = pexpect.spawn(sys.executable, ['-m', 'IPython', '--colors=nocolor', '--simple-prompt'],
				env=env)
				child.timeout = 15 * IPYTHON_TESTING_TIMEOUT_SCALE

				child.expect(in_prompt)

				child.timeout = 2 * IPYTHON_TESTING_TIMEOUT_SCALE

				child.sendline("def f(x):")
				child.sendline(" raise Exception")
				child.sendline("")

				child.expect(in_prompt)
				child.sendline("gen = (f(x) for x in [0])")
				child.sendline("")

				child.expect(in_prompt)
				child.sendline("for x in gen:")
				child.sendline(" pass")
				child.sendline("")

				child.timeout = 10 * IPYTHON_TESTING_TIMEOUT_SCALE

				child.expect('Exception:')

				child.expect(in_prompt)
				child.sendline(r'%debug')
				child.expect('----> 2 raise Exception')

				child.expect(ipdb_prompt)
				child.sendline('u')
				child.expect_exact(r'----> 1 gen = (f(x) for x in [0])')

				child.expect(ipdb_prompt)
				child.sendline('u')
				child.expect_exact('----> 1 for x in gen:')

				child.expect(ipdb_prompt)
				child.sendline('u')
				child.expect_exact('*** Oldest frame')

				child.expect(ipdb_prompt)
				child.sendline('exit')

				child.expect(in_prompt)
				child.sendline('exit')

				child.close()