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

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).

Matthias Bussonnier - - Load All Authors

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      """Error script. DO NOT EDIT FURTHER! It will break exception doctests!!!"""

      import sys

      def div0():

          "foo"

          x = 1

          y = 0

          x/y

      def sysexit(stat, mode):

          raise SystemExit(stat, f"Mode = {mode}")

      def bar(mode):

          "bar"

          if mode=='div':

              div0()

          elif mode=='exit':

              try:

                  stat = int(sys.argv[2])

              except:

                  stat = 1

              sysexit(stat, mode)

          else:

              raise ValueError('Unknown mode')

      if __name__ == '__main__':

          try:

              mode = sys.argv[1]

          except IndexError:

              mode = 'div'

          bar(mode)

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				"""Error script. DO NOT EDIT FURTHER! It will break exception doctests!!!"""
				import sys

				def div0():
				"foo"
				x = 1
				y = 0
				x/y

				def sysexit(stat, mode):
				raise SystemExit(stat, f"Mode = {mode}")


				def bar(mode):
				"bar"
				if mode=='div':
				div0()
				elif mode=='exit':
				try:
				stat = int(sys.argv[2])
				except:
				stat = 1
				sysexit(stat, mode)
				else:
				raise ValueError('Unknown mode')

				if __name__ == '__main__':
				try:
				mode = sys.argv[1]
				except IndexError:
				mode = 'div'

				bar(mode)