Function test_ipython_display_formatter

tests/test_formatters.py:462–494

Objects with _ipython_display_ defined bypass other formatters

()

def test_ipython_display_formatter():
    """Objects with _ipython_display_ defined bypass other formatters"""
    f = get_ipython().display_formatter
    catcher = []

    class SelfDisplaying(object):
        def _ipython_display_(self):
            catcher.append(self)

    class NotSelfDisplaying(object):
        def __repr__(self):
            return "NotSelfDisplaying"

        def _ipython_display_(self):
            raise NotImplementedError

    save_enabled = f.ipython_display_formatter.enabled
    f.ipython_display_formatter.enabled = True

    yes = SelfDisplaying()
    no = NotSelfDisplaying()

    d, md = f.format(no)
    assert d == {"text/plain": repr(no)}
    assert md == {}
    assert catcher == []

    d, md = f.format(yes)
    assert d == {}
    assert md == {}
    assert catcher == [yes]

    f.ipython_display_formatter.enabled = save_enabled


def test_repr_mime():