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Refuse to install event loop hooks when not using `prompt_toolkit` (#14132)...
Refuse to install event loop hooks when not using `prompt_toolkit` (#14132) Without this, `%gui` is effectively a no-op but the user thinks it works. For example. If running `ipython`: ``` In [1]: import matplotlib; matplotlib.use('QtAgg'); from matplotlib import pyplot; pyplot.ion(); pyplot.plot([1, 2, 3, 4]) Installed qt6 event loop hook. Out[1]: [<matplotlib.lines.Line2D at 0x1ba2f59d2a0>] ``` The window appears and responds as expected. If running `ipython --simple-prompt`, the user would see the same output, when in fact no event loop hook was installed since it's not supported without `prompt_toolkit`. The resulting Qt window is unresponsive because the event loop is not running, i.e. with `--simple-prompt`, Qt windows should block (but `pyplot` doesn't/can't know to do that) With this PR, the user will see: ``` In [1]: import matplotlib; matplotlib.use('QtAgg'); from matplotlib import pyplot; pyplot.ion(); pyplot.plot([1, 2, 3, 4]) Cannot install event loop hook for "qt" when running with `--simple-prompt`. NOTE: Tk is supported natively; use Tk apps and Tk backends with `--simple-prompt`. Out[1]: [<matplotlib.lines.Line2D at 0x170be0c0310>] ``` They'll still get an unresponsive Qt window, but they'll at least be told this can't work (while anything using Tk will work just fine).
Scott Sanderson - - Load All Authors

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error.py
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# encoding: utf-8
"""
Global exception classes for IPython.core.
Authors:
* Brian Granger
* Fernando Perez
* Min Ragan-Kelley
Notes
-----
"""
#-----------------------------------------------------------------------------
# Copyright (C) 2008 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
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Exception classes
#-----------------------------------------------------------------------------
class IPythonCoreError(Exception):
pass
class TryNext(IPythonCoreError):
"""Try next hook exception.
Raise this in your hook function to indicate that the next hook handler
should be used to handle the operation.
"""
class UsageError(IPythonCoreError):
"""Error in magic function arguments, etc.
Something that probably won't warrant a full traceback, but should
nevertheless interrupt a macro / batch file.
"""
class StdinNotImplementedError(IPythonCoreError, NotImplementedError):
"""raw_input was requested in a context where it is not supported
For use in IPython kernels, where only some frontends may support
stdin requests.
"""
class InputRejected(Exception):
"""Input rejected by ast transformer.
Raise this in your NodeTransformer to indicate that InteractiveShell should
not execute the supplied input.
"""