upstream/ipython Files · IPython/core/tests/test_prompts.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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      # -*- coding: utf-8

      """Tests for prompt generation."""

      import unittest

      from IPython.core.prompts import  LazyEvaluate

      class PromptTests(unittest.TestCase):

          def test_lazy_eval_unicode(self):

              u = u'ünicødé'

              lz = LazyEvaluate(lambda : u)

              self.assertEqual(str(lz), u)

              self.assertEqual(format(lz), u)

          def test_lazy_eval_nonascii_bytes(self):

              u = u'ünicødé'

              b = u.encode('utf8')

              lz = LazyEvaluate(lambda : b)

              # unicode(lz) would fail

              self.assertEqual(str(lz), str(b))

              self.assertEqual(format(lz), str(b))

          def test_lazy_eval_float(self):

              f = 0.503

              lz = LazyEvaluate(lambda : f)

              self.assertEqual(str(lz), str(f))

              self.assertEqual(format(lz), str(f))

              self.assertEqual(format(lz, '.1'), '0.5')

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				# -*- coding: utf-8
				"""Tests for prompt generation."""

				import unittest

				from IPython.core.prompts import LazyEvaluate

				class PromptTests(unittest.TestCase):
				def test_lazy_eval_unicode(self):
				u = u'ünicødé'
				lz = LazyEvaluate(lambda : u)
				self.assertEqual(str(lz), u)
				self.assertEqual(format(lz), u)

				def test_lazy_eval_nonascii_bytes(self):
				u = u'ünicødé'
				b = u.encode('utf8')
				lz = LazyEvaluate(lambda : b)
				# unicode(lz) would fail
				self.assertEqual(str(lz), str(b))
				self.assertEqual(format(lz), str(b))

				def test_lazy_eval_float(self):
				f = 0.503
				lz = LazyEvaluate(lambda : f)

				self.assertEqual(str(lz), str(f))
				self.assertEqual(format(lz), str(f))
				self.assertEqual(format(lz, '.1'), '0.5')