##// END OF EJS Templates
upstream » ipython
RSS

Clone from https://github.com/ipython/ipython.git

Swallow potential exceptions from showtraceback() (#13934)...
Swallow potential exceptions from showtraceback() (#13934) The nbgrader project is aware of a form of cheating where students disrupt `InteractiveShell.showtraceback` in hopes of hiding exceptions to avoid losing points. They have implemented a solution to prevent this cheating from working on the client side, and have some tests to demonstrate this technique: https://github.com/jupyter/nbgrader/blob/main/nbgrader/tests/apps/files/submitted-cheat-attempt.ipynb https://github.com/jupyter/nbgrader/blob/main/nbgrader/tests/apps/files/submitted-cheat-attempt-alternative.ipynb In essence, these attacks import the interactive shell and erase the traceback handler so that their failing tests won't report failures. ```python import IPython.core.interactiveshell IPython.core.interactiveshell.InteractiveShell.showtraceback = None ``` The problem is that this causes an exception inside the kernel, leading to a stalled execution. The kernel has stopped working, but the client continues to wait for messages. So far, nbgrader's solution to this is to require a timeout value so the client can eventually decide it is done. This prevents allowing a value of `None` for `Execute.timeout` because this would cause a test case to infinitely hang. This commit addresses the problem by making `InteractiveShell._run_cell` a little more protective around it's call to `showtraceback()`. There is already a try/except block around running the cell. This commit adds a finally clause so that the method will _always_ return an `ExecutionResult`, even if a new exception is thrown within the except clause. For the record, the exception thrown is: TypeError: 'NoneType' object is not callable Accepting this change will allow nbgrader to update `nbgrader.preprocessors.Execute` to support a type of `Integer(allow_none=True)` as the parent `NotebookClient` intended. Discussion about this is ongoing in jupyter/nbgrader#1690.
Matthias Bussonnier - - Load All Authors

File last commit:

r27329:745fc89c
r28101:e548ee23 merge
Show More
long_description.rst
37 lines | 1.4 KiB | text/x-rst | RstLexer
/ long_description.rst
History | Source | Raw |Copy content |Copy permalink
Matthias Bussonnier
fix long description
 r27317 IPython provides a rich toolkit to help you make the most out of using Python
interactively. Its main components are:
Matthias Bussonnier
3rd attempt at 8.0.0a1
 r27329 * A powerful interactive Python shell
* A `Jupyter <https://jupyter.org/>`_ kernel to work with Python code in Jupyter
notebooks and other interactive frontends.
Matthias Bussonnier
fix long description
 r27317
The enhanced interactive Python shells have the following main features:
Matthias Bussonnier
3rd attempt at 8.0.0a1
 r27329 * Comprehensive object introspection.
Matthias Bussonnier
fix long description
 r27317
Matthias Bussonnier
3rd attempt at 8.0.0a1
 r27329 * Input history, persistent across sessions.
Matthias Bussonnier
fix long description
 r27317
Matthias Bussonnier
3rd attempt at 8.0.0a1
 r27329 * Caching of output results during a session with automatically generated
references.
Matthias Bussonnier
fix long description
 r27317
Matthias Bussonnier
3rd attempt at 8.0.0a1
 r27329 * Extensible tab completion, with support by default for completion of python
variables and keywords, filenames and function keywords.
Matthias Bussonnier
fix long description
 r27317
Matthias Bussonnier
3rd attempt at 8.0.0a1
 r27329 * Extensible system of 'magic' commands for controlling the environment and
performing many tasks related either to IPython or the operating system.
Matthias Bussonnier
fix long description
 r27317
Matthias Bussonnier
3rd attempt at 8.0.0a1
 r27329 * A rich configuration system with easy switching between different setups
(simpler than changing $PYTHONSTARTUP environment variables every time).
Matthias Bussonnier
fix long description
 r27317
Matthias Bussonnier
3rd attempt at 8.0.0a1
 r27329 * Session logging and reloading.
Matthias Bussonnier
fix long description
 r27317
Matthias Bussonnier
3rd attempt at 8.0.0a1
 r27329 * Extensible syntax processing for special purpose situations.
Matthias Bussonnier
fix long description
 r27317
Matthias Bussonnier
3rd attempt at 8.0.0a1
 r27329 * Access to the system shell with user-extensible alias system.
Matthias Bussonnier
fix long description
 r27317
Matthias Bussonnier
3rd attempt at 8.0.0a1
 r27329 * Easily embeddable in other Python programs and GUIs.
Matthias Bussonnier
fix long description
 r27317
Matthias Bussonnier
3rd attempt at 8.0.0a1
 r27329 * Integrated access to the pdb debugger and the Python profiler.
Matthias Bussonnier
fix long description
 r27317
The latest development version is always available from IPython's `GitHub
site <http://github.com/ipython>`_.