##// END OF EJS Templates
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).

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display.py
93 lines | 3.1 KiB | text/x-python | PythonLexer
"""Simple magics for display formats"""
#-----------------------------------------------------------------------------
# Copyright (c) 2012 The IPython Development Team.
#
# Distributed under the terms of the Modified BSD License.
#
# The full license is in the file COPYING.txt, distributed with this software.
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
# Our own packages
from IPython.display import display, Javascript, Latex, SVG, HTML, Markdown
from IPython.core.magic import (
Magics, magics_class, cell_magic
)
from IPython.core import magic_arguments
#-----------------------------------------------------------------------------
# Magic implementation classes
#-----------------------------------------------------------------------------
@magics_class
class DisplayMagics(Magics):
"""Magics for displaying various output types with literals
Defines javascript/latex/svg/html cell magics for writing
blocks in those languages, to be rendered in the frontend.
"""
@cell_magic
def js(self, line, cell):
"""Run the cell block of Javascript code
Alias of `%%javascript`
Starting with IPython 8.0 %%javascript is pending deprecation to be replaced
by a more flexible system
Please See https://github.com/ipython/ipython/issues/13376
"""
self.javascript(line, cell)
@cell_magic
def javascript(self, line, cell):
"""Run the cell block of Javascript code
Starting with IPython 8.0 %%javascript is pending deprecation to be replaced
by a more flexible system
Please See https://github.com/ipython/ipython/issues/13376
"""
display(Javascript(cell))
@cell_magic
def latex(self, line, cell):
"""Render the cell as a block of LaTeX
The subset of LaTeX which is supported depends on the implementation in
the client. In the Jupyter Notebook, this magic only renders the subset
of LaTeX defined by MathJax
[here](https://docs.mathjax.org/en/v2.5-latest/tex.html)."""
display(Latex(cell))
@cell_magic
def svg(self, line, cell):
"""Render the cell as an SVG literal"""
display(SVG(cell))
@magic_arguments.magic_arguments()
@magic_arguments.argument(
'--isolated', action='store_true', default=False,
help="""Annotate the cell as 'isolated'.
Isolated cells are rendered inside their own <iframe> tag"""
)
@cell_magic
def html(self, line, cell):
"""Render the cell as a block of HTML"""
args = magic_arguments.parse_argstring(self.html, line)
html = HTML(cell)
if args.isolated:
display(html, metadata={'text/html':{'isolated':True}})
else:
display(html)
@cell_magic
def markdown(self, line, cell):
"""Render the cell as Markdown text block"""
display(Markdown(cell))