ipdoctest: Merge upstream changes to pytest doctest plugin

IPython/testing/plugin/pytest_ipdoctest.py

@@ -1,786 +1,789 b''
 # Based on Pytest doctest.py
 # Original license:
 # The MIT License (MIT)
 #
 # Copyright (c) 2004-2021 Holger Krekel and others
 """Discover and run ipdoctests in modules and test files."""
 import builtins
 import bdb
 import inspect
 import os
 import platform
 import sys
 import traceback
 import types
 import warnings
 from contextlib import contextmanager
+from pathlib import Path
 from typing import Any
 from typing import Callable
 from typing import Dict
 from typing import Generator
 from typing import Iterable
 from typing import List
 from typing import Optional
 from typing import Pattern
 from typing import Sequence
 from typing import Tuple
 from typing import Type
 from typing import TYPE_CHECKING
 from typing import Union
 
-import py.path
-
 import pytest
 from _pytest import outcomes
 from _pytest._code.code import ExceptionInfo
 from _pytest._code.code import ReprFileLocation
 from _pytest._code.code import TerminalRepr
 from _pytest._io import TerminalWriter
 from _pytest.compat import safe_getattr
 from _pytest.config import Config
 from _pytest.config.argparsing import Parser
 from _pytest.fixtures import FixtureRequest
 from _pytest.nodes import Collector
 from _pytest.outcomes import OutcomeException
+from _pytest.pathlib import fnmatch_ex
 from _pytest.pathlib import import_path
 from _pytest.python_api import approx
 from _pytest.warning_types import PytestWarning
 
 if TYPE_CHECKING:
     import doctest
 
 DOCTEST_REPORT_CHOICE_NONE = "none"
 DOCTEST_REPORT_CHOICE_CDIFF = "cdiff"
 DOCTEST_REPORT_CHOICE_NDIFF = "ndiff"
 DOCTEST_REPORT_CHOICE_UDIFF = "udiff"
 DOCTEST_REPORT_CHOICE_ONLY_FIRST_FAILURE = "only_first_failure"
 
 DOCTEST_REPORT_CHOICES = (
     DOCTEST_REPORT_CHOICE_NONE,
     DOCTEST_REPORT_CHOICE_CDIFF,
     DOCTEST_REPORT_CHOICE_NDIFF,
     DOCTEST_REPORT_CHOICE_UDIFF,
     DOCTEST_REPORT_CHOICE_ONLY_FIRST_FAILURE,
 )
 
 # Lazy definition of runner class
 RUNNER_CLASS = None
 # Lazy definition of output checker class
 CHECKER_CLASS: Optional[Type["IPDoctestOutputChecker"]] = None
 
 
 def pytest_addoption(parser: Parser) -> None:
     parser.addini(
         "ipdoctest_optionflags",
         "option flags for ipdoctests",
         type="args",
         default=["ELLIPSIS"],
     )
     parser.addini(
         "ipdoctest_encoding", "encoding used for ipdoctest files", default="utf-8"
     )
     group = parser.getgroup("collect")
     group.addoption(
         "--ipdoctest-modules",
         action="store_true",
         default=False,
         help="run ipdoctests in all .py modules",
         dest="ipdoctestmodules",
     )
     group.addoption(
         "--ipdoctest-report",
         type=str.lower,
         default="udiff",
         help="choose another output format for diffs on ipdoctest failure",
         choices=DOCTEST_REPORT_CHOICES,
         dest="ipdoctestreport",
     )
     group.addoption(
         "--ipdoctest-glob",
         action="append",
         default=[],
         metavar="pat",
         help="ipdoctests file matching pattern, default: test*.txt",
         dest="ipdoctestglob",
     )
     group.addoption(
         "--ipdoctest-ignore-import-errors",
         action="store_true",
         default=False,
         help="ignore ipdoctest ImportErrors",
         dest="ipdoctest_ignore_import_errors",
     )
     group.addoption(
         "--ipdoctest-continue-on-failure",
         action="store_true",
         default=False,
         help="for a given ipdoctest, continue to run after the first failure",
         dest="ipdoctest_continue_on_failure",
     )
 
 
 def pytest_unconfigure() -> None:
     global RUNNER_CLASS
 
     RUNNER_CLASS = None
 
 
 def pytest_collect_file(
-    path: py.path.local,
+    file_path: Path,
     parent: Collector,
 ) -> Optional[Union["IPDoctestModule", "IPDoctestTextfile"]]:
     config = parent.config
-    if path.ext == ".py":
-        if config.option.ipdoctestmodules and not _is_setup_py(path):
-            mod: IPDoctestModule = IPDoctestModule.from_parent(parent, fspath=path)
+    if file_path.suffix == ".py":
+        if config.option.ipdoctestmodules and not any(
+            (_is_setup_py(file_path), _is_main_py(file_path))
+        ):
+            mod: IPDoctestModule = IPDoctestModule.from_parent(parent, path=file_path)
             return mod
-    elif _is_ipdoctest(config, path, parent):
-        txt: IPDoctestTextfile = IPDoctestTextfile.from_parent(parent, fspath=path)
+    elif _is_ipdoctest(config, file_path, parent):
+        txt: IPDoctestTextfile = IPDoctestTextfile.from_parent(parent, path=file_path)
         return txt
     return None
 
 
-def _is_setup_py(path: py.path.local) -> bool:
-    if path.basename != "setup.py":
+def _is_setup_py(path: Path) -> bool:
+    if path.name != "setup.py":
         return False
-    contents = path.read_binary()
+    contents = path.read_bytes()
     return b"setuptools" in contents or b"distutils" in contents
 
 
-def _is_ipdoctest(config: Config, path: py.path.local, parent) -> bool:
-    if path.ext in (".txt", ".rst") and parent.session.isinitpath(path):
+def _is_ipdoctest(config: Config, path: Path, parent: Collector) -> bool:
+    if path.suffix in (".txt", ".rst") and parent.session.isinitpath(path):
         return True
     globs = config.getoption("ipdoctestglob") or ["test*.txt"]
-    for glob in globs:
-        if path.check(fnmatch=glob):
-            return True
-    return False
+    return any(fnmatch_ex(glob, path) for glob in globs)
+
+
+def _is_main_py(path: Path) -> bool:
+    return path.name == "__main__.py"
 
 
 class ReprFailDoctest(TerminalRepr):
     def __init__(
         self, reprlocation_lines: Sequence[Tuple[ReprFileLocation, Sequence[str]]]
     ) -> None:
         self.reprlocation_lines = reprlocation_lines
 
     def toterminal(self, tw: TerminalWriter) -> None:
         for reprlocation, lines in self.reprlocation_lines:
             for line in lines:
                 tw.line(line)
             reprlocation.toterminal(tw)
 
 
 class MultipleDoctestFailures(Exception):
     def __init__(self, failures: Sequence["doctest.DocTestFailure"]) -> None:
         super().__init__()
         self.failures = failures
 
 
 def _init_runner_class() -> Type["IPDocTestRunner"]:
     import doctest
     from .ipdoctest import IPDocTestRunner
 
     class PytestDoctestRunner(IPDocTestRunner):
         """Runner to collect failures.
 
         Note that the out variable in this case is a list instead of a
         stdout-like object.
         """
 
         def __init__(
             self,
             checker: Optional["IPDoctestOutputChecker"] = None,
             verbose: Optional[bool] = None,
             optionflags: int = 0,
             continue_on_failure: bool = True,
         ) -> None:
             super().__init__(checker=checker, verbose=verbose, optionflags=optionflags)
             self.continue_on_failure = continue_on_failure
 
         def report_failure(
             self,
             out,
             test: "doctest.DocTest",
             example: "doctest.Example",
             got: str,
         ) -> None:
             failure = doctest.DocTestFailure(test, example, got)
             if self.continue_on_failure:
                 out.append(failure)
             else:
                 raise failure
 
         def report_unexpected_exception(
             self,
             out,
             test: "doctest.DocTest",
             example: "doctest.Example",
             exc_info: Tuple[Type[BaseException], BaseException, types.TracebackType],
         ) -> None:
             if isinstance(exc_info[1], OutcomeException):
                 raise exc_info[1]
             if isinstance(exc_info[1], bdb.BdbQuit):
                 outcomes.exit("Quitting debugger")
             failure = doctest.UnexpectedException(test, example, exc_info)
             if self.continue_on_failure:
                 out.append(failure)
             else:
                 raise failure
 
     return PytestDoctestRunner
 
 
 def _get_runner(
     checker: Optional["IPDoctestOutputChecker"] = None,
     verbose: Optional[bool] = None,
     optionflags: int = 0,
     continue_on_failure: bool = True,
 ) -> "IPDocTestRunner":
     # We need this in order to do a lazy import on doctest
     global RUNNER_CLASS
     if RUNNER_CLASS is None:
         RUNNER_CLASS = _init_runner_class()
     # Type ignored because the continue_on_failure argument is only defined on
     # PytestDoctestRunner, which is lazily defined so can't be used as a type.
     return RUNNER_CLASS(  # type: ignore
         checker=checker,
         verbose=verbose,
         optionflags=optionflags,
         continue_on_failure=continue_on_failure,
     )
 
 
 class IPDoctestItem(pytest.Item):
     def __init__(
         self,
         name: str,
         parent: "Union[IPDoctestTextfile, IPDoctestModule]",
         runner: Optional["IPDocTestRunner"] = None,
         dtest: Optional["doctest.DocTest"] = None,
     ) -> None:
         super().__init__(name, parent)
         self.runner = runner
         self.dtest = dtest
         self.obj = None
         self.fixture_request: Optional[FixtureRequest] = None
 
     @classmethod
     def from_parent(  # type: ignore
         cls,
         parent: "Union[IPDoctestTextfile, IPDoctestModule]",
         *,
         name: str,
         runner: "IPDocTestRunner",
         dtest: "doctest.DocTest",
     ):
-        # incompatible signature due to to imposed limits on sublcass
+        # incompatible signature due to imposed limits on subclass
         """The public named constructor."""
         return super().from_parent(name=name, parent=parent, runner=runner, dtest=dtest)
 
     def setup(self) -> None:
         if self.dtest is not None:
             self.fixture_request = _setup_fixtures(self)
             globs = dict(getfixture=self.fixture_request.getfixturevalue)
             for name, value in self.fixture_request.getfixturevalue(
                 "ipdoctest_namespace"
             ).items():
                 globs[name] = value
             self.dtest.globs.update(globs)
 
             from .ipdoctest import IPExample
 
             if isinstance(self.dtest.examples[0], IPExample):
                 # for IPython examples *only*, we swap the globals with the ipython
                 # namespace, after updating it with the globals (which doctest
                 # fills with the necessary info from the module being tested).
                 self._user_ns_orig = {}
                 self._user_ns_orig.update(_ip.user_ns)
                 _ip.user_ns.update(self.dtest.globs)
                 # We must remove the _ key in the namespace, so that Python's
                 # doctest code sets it naturally
                 _ip.user_ns.pop("_", None)
                 _ip.user_ns["__builtins__"] = builtins
                 self.dtest.globs = _ip.user_ns
 
     def teardown(self) -> None:
         from .ipdoctest import IPExample
 
         # Undo the test.globs reassignment we made
         if isinstance(self.dtest.examples[0], IPExample):
             self.dtest.globs = {}
             _ip.user_ns.clear()
             _ip.user_ns.update(self._user_ns_orig)
             del self._user_ns_orig
 
         self.dtest.globs.clear()
 
     def runtest(self) -> None:
         assert self.dtest is not None
         assert self.runner is not None
         _check_all_skipped(self.dtest)
         self._disable_output_capturing_for_darwin()
         failures: List["doctest.DocTestFailure"] = []
 
         # exec(compile(..., "single", ...), ...) puts result in builtins._
         had_underscore_value = hasattr(builtins, "_")
         underscore_original_value = getattr(builtins, "_", None)
 
         # Save our current directory and switch out to the one where the
         # test was originally created, in case another doctest did a
         # directory change.  We'll restore this in the finally clause.
         curdir = os.getcwd()
         os.chdir(self.fspath.dirname)
         try:
             # Type ignored because we change the type of `out` from what
             # ipdoctest expects.
             self.runner.run(self.dtest, out=failures, clear_globs=False)  # type: ignore[arg-type]
         finally:
             os.chdir(curdir)
             if had_underscore_value:
                 setattr(builtins, "_", underscore_original_value)
             elif hasattr(builtins, "_"):
                 delattr(builtins, "_")
 
         if failures:
             raise MultipleDoctestFailures(failures)
 
     def _disable_output_capturing_for_darwin(self) -> None:
         """Disable output capturing. Otherwise, stdout is lost to ipdoctest (pytest#985)."""
         if platform.system() != "Darwin":
             return
         capman = self.config.pluginmanager.getplugin("capturemanager")
         if capman:
             capman.suspend_global_capture(in_=True)
             out, err = capman.read_global_capture()
             sys.stdout.write(out)
             sys.stderr.write(err)
 
     # TODO: Type ignored -- breaks Liskov Substitution.
     def repr_failure(  # type: ignore[override]
         self,
         excinfo: ExceptionInfo[BaseException],
     ) -> Union[str, TerminalRepr]:
         import doctest
 
         failures: Optional[
             Sequence[Union[doctest.DocTestFailure, doctest.UnexpectedException]]
         ] = None
         if isinstance(
             excinfo.value, (doctest.DocTestFailure, doctest.UnexpectedException)
         ):
             failures = [excinfo.value]
         elif isinstance(excinfo.value, MultipleDoctestFailures):
             failures = excinfo.value.failures
 
-        if failures is not None:
+        if failures is None:
+            return super().repr_failure(excinfo)
+
             reprlocation_lines = []
             for failure in failures:
                 example = failure.example
                 test = failure.test
                 filename = test.filename
                 if test.lineno is None:
                     lineno = None
                 else:
                     lineno = test.lineno + example.lineno + 1
                 message = type(failure).__name__
                 # TODO: ReprFileLocation doesn't expect a None lineno.
                 reprlocation = ReprFileLocation(filename, lineno, message)  # type: ignore[arg-type]
                 checker = _get_checker()
-                report_choice = _get_report_choice(
-                    self.config.getoption("ipdoctestreport")
-                )
+            report_choice = _get_report_choice(self.config.getoption("ipdoctestreport"))
                 if lineno is not None:
                     assert failure.test.docstring is not None
                     lines = failure.test.docstring.splitlines(False)
                     # add line numbers to the left of the error message
                     assert test.lineno is not None
                     lines = [
-                        "%03d %s" % (i + test.lineno + 1, x)
-                        for (i, x) in enumerate(lines)
+                    "%03d %s" % (i + test.lineno + 1, x) for (i, x) in enumerate(lines)
                     ]
                     # trim docstring error lines to 10
                     lines = lines[max(example.lineno - 9, 0) : example.lineno + 1]
                 else:
                     lines = [
                         "EXAMPLE LOCATION UNKNOWN, not showing all tests of that example"
                     ]
                     indent = ">>>"
                     for line in example.source.splitlines():
                         lines.append(f"??? {indent} {line}")
                         indent = "..."
                 if isinstance(failure, doctest.DocTestFailure):
                     lines += checker.output_difference(
                         example, failure.got, report_choice
                     ).split("\n")
                 else:
-                    inner_excinfo = ExceptionInfo(failure.exc_info)
+                inner_excinfo = ExceptionInfo.from_exc_info(failure.exc_info)
                     lines += ["UNEXPECTED EXCEPTION: %s" % repr(inner_excinfo.value)]
                     lines += [
-                        x.strip("\n")
-                        for x in traceback.format_exception(*failure.exc_info)
+                    x.strip("\n") for x in traceback.format_exception(*failure.exc_info)
                     ]
                 reprlocation_lines.append((reprlocation, lines))
             return ReprFailDoctest(reprlocation_lines)
-        else:
-            return super().repr_failure(excinfo)
 
-    def reportinfo(self):
+    def reportinfo(self) -> Tuple[Union["os.PathLike[str]", str], Optional[int], str]:
         assert self.dtest is not None
-        return self.fspath, self.dtest.lineno, "[ipdoctest] %s" % self.name
+        return self.path, self.dtest.lineno, "[ipdoctest] %s" % self.name
 
 
 def _get_flag_lookup() -> Dict[str, int]:
     import doctest
 
     return dict(
         DONT_ACCEPT_TRUE_FOR_1=doctest.DONT_ACCEPT_TRUE_FOR_1,
         DONT_ACCEPT_BLANKLINE=doctest.DONT_ACCEPT_BLANKLINE,
         NORMALIZE_WHITESPACE=doctest.NORMALIZE_WHITESPACE,
         ELLIPSIS=doctest.ELLIPSIS,
         IGNORE_EXCEPTION_DETAIL=doctest.IGNORE_EXCEPTION_DETAIL,
         COMPARISON_FLAGS=doctest.COMPARISON_FLAGS,
         ALLOW_UNICODE=_get_allow_unicode_flag(),
         ALLOW_BYTES=_get_allow_bytes_flag(),
         NUMBER=_get_number_flag(),
     )
 
 
 def get_optionflags(parent):
     optionflags_str = parent.config.getini("ipdoctest_optionflags")
     flag_lookup_table = _get_flag_lookup()
     flag_acc = 0
     for flag in optionflags_str:
         flag_acc |= flag_lookup_table[flag]
     return flag_acc
 
 
 def _get_continue_on_failure(config):
     continue_on_failure = config.getvalue("ipdoctest_continue_on_failure")
     if continue_on_failure:
         # We need to turn off this if we use pdb since we should stop at
         # the first failure.
         if config.getvalue("usepdb"):
             continue_on_failure = False
     return continue_on_failure
 
 
 class IPDoctestTextfile(pytest.Module):
     obj = None
 
     def collect(self) -> Iterable[IPDoctestItem]:
         import doctest
         from .ipdoctest import IPDocTestParser
 
         # Inspired by doctest.testfile; ideally we would use it directly,
         # but it doesn't support passing a custom checker.
         encoding = self.config.getini("ipdoctest_encoding")
-        text = self.fspath.read_text(encoding)
-        filename = str(self.fspath)
-        name = self.fspath.basename
+        text = self.path.read_text(encoding)
+        filename = str(self.path)
+        name = self.path.name
         globs = {"__name__": "__main__"}
 
         optionflags = get_optionflags(self)
 
         runner = _get_runner(
             verbose=False,
             optionflags=optionflags,
             checker=_get_checker(),
             continue_on_failure=_get_continue_on_failure(self.config),
         )
 
         parser = IPDocTestParser()
         test = parser.get_doctest(text, globs, name, filename, 0)
         if test.examples:
             yield IPDoctestItem.from_parent(
                 self, name=test.name, runner=runner, dtest=test
             )
 
 
 def _check_all_skipped(test: "doctest.DocTest") -> None:
     """Raise pytest.skip() if all examples in the given DocTest have the SKIP
     option set."""
     import doctest
 
     all_skipped = all(x.options.get(doctest.SKIP, False) for x in test.examples)
     if all_skipped:
         pytest.skip("all docstests skipped by +SKIP option")
 
 
 def _is_mocked(obj: object) -> bool:
     """Return if an object is possibly a mock object by checking the
     existence of a highly improbable attribute."""
     return (
         safe_getattr(obj, "pytest_mock_example_attribute_that_shouldnt_exist", None)
         is not None
     )
 
 
 @contextmanager
 def _patch_unwrap_mock_aware() -> Generator[None, None, None]:
     """Context manager which replaces ``inspect.unwrap`` with a version
     that's aware of mock objects and doesn't recurse into them."""
     real_unwrap = inspect.unwrap
 
     def _mock_aware_unwrap(
         func: Callable[..., Any], *, stop: Optional[Callable[[Any], Any]] = None
     ) -> Any:
         try:
             if stop is None or stop is _is_mocked:
                 return real_unwrap(func, stop=_is_mocked)
             _stop = stop
             return real_unwrap(func, stop=lambda obj: _is_mocked(obj) or _stop(func))
         except Exception as e:
             warnings.warn(
                 "Got %r when unwrapping %r.  This is usually caused "
                 "by a violation of Python's object protocol; see e.g. "
                 "https://github.com/pytest-dev/pytest/issues/5080" % (e, func),
                 PytestWarning,
             )
             raise
 
     inspect.unwrap = _mock_aware_unwrap
     try:
         yield
     finally:
         inspect.unwrap = real_unwrap
 
 
 class IPDoctestModule(pytest.Module):
     def collect(self) -> Iterable[IPDoctestItem]:
         import doctest
         from .ipdoctest import DocTestFinder, IPDocTestParser
 
         class MockAwareDocTestFinder(DocTestFinder):
             """A hackish ipdoctest finder that overrides stdlib internals to fix a stdlib bug.
 
             https://github.com/pytest-dev/pytest/issues/3456
             https://bugs.python.org/issue25532
             """
 
             def _find_lineno(self, obj, source_lines):
                 """Doctest code does not take into account `@property`, this
-                is a hackish way to fix it.
+                is a hackish way to fix it. https://bugs.python.org/issue17446
 
-                https://bugs.python.org/issue17446
+                Wrapped Doctests will need to be unwrapped so the correct
+                line number is returned. This will be reported upstream. #8796
                 """
                 if isinstance(obj, property):
                     obj = getattr(obj, "fget", obj)
+
+                if hasattr(obj, "__wrapped__"):
+                    # Get the main obj in case of it being wrapped
+                    obj = inspect.unwrap(obj)
+
                 # Type ignored because this is a private function.
-                return DocTestFinder._find_lineno(  # type: ignore
-                    self,
+                return super()._find_lineno(  # type:ignore[misc]
                     obj,
                     source_lines,
                 )
 
             def _find(
                 self, tests, obj, name, module, source_lines, globs, seen
             ) -> None:
                 if _is_mocked(obj):
                     return
                 with _patch_unwrap_mock_aware():
 
                     # Type ignored because this is a private function.
-                    DocTestFinder._find(  # type: ignore
-                        self, tests, obj, name, module, source_lines, globs, seen
+                    super()._find(  # type:ignore[misc]
+                        tests, obj, name, module, source_lines, globs, seen
                     )
 
-        if self.fspath.basename == "conftest.py":
+        if self.path.name == "conftest.py":
             module = self.config.pluginmanager._importconftest(
-                self.fspath, self.config.getoption("importmode")
+                self.path,
+                self.config.getoption("importmode"),
+                rootpath=self.config.rootpath,
             )
         else:
             try:
-                module = import_path(self.fspath)
+                module = import_path(self.path, root=self.config.rootpath)
             except ImportError:
                 if self.config.getvalue("ipdoctest_ignore_import_errors"):
-                    pytest.skip("unable to import module %r" % self.fspath)
+                    pytest.skip("unable to import module %r" % self.path)
                 else:
                     raise
         # Uses internal doctest module parsing mechanism.
         finder = MockAwareDocTestFinder(parser=IPDocTestParser())
         optionflags = get_optionflags(self)
         runner = _get_runner(
             verbose=False,
             optionflags=optionflags,
             checker=_get_checker(),
             continue_on_failure=_get_continue_on_failure(self.config),
         )
 
         for test in finder.find(module, module.__name__):
             if test.examples:  # skip empty ipdoctests
                 yield IPDoctestItem.from_parent(
                     self, name=test.name, runner=runner, dtest=test
                 )
 
 
 def _setup_fixtures(doctest_item: IPDoctestItem) -> FixtureRequest:
     """Used by IPDoctestTextfile and IPDoctestItem to setup fixture information."""
 
     def func() -> None:
         pass
 
     doctest_item.funcargs = {}  # type: ignore[attr-defined]
     fm = doctest_item.session._fixturemanager
     doctest_item._fixtureinfo = fm.getfixtureinfo(  # type: ignore[attr-defined]
         node=doctest_item, func=func, cls=None, funcargs=False
     )
     fixture_request = FixtureRequest(doctest_item, _ispytest=True)
     fixture_request._fillfixtures()
     return fixture_request
 
 
 def _init_checker_class() -> Type["IPDoctestOutputChecker"]:
     import doctest
     import re
     from .ipdoctest import IPDoctestOutputChecker
 
     class LiteralsOutputChecker(IPDoctestOutputChecker):
         # Based on doctest_nose_plugin.py from the nltk project
         # (https://github.com/nltk/nltk) and on the "numtest" doctest extension
         # by Sebastien Boisgerault (https://github.com/boisgera/numtest).
 
         _unicode_literal_re = re.compile(r"(\W|^)[uU]([rR]?[\'\"])", re.UNICODE)
         _bytes_literal_re = re.compile(r"(\W|^)[bB]([rR]?[\'\"])", re.UNICODE)
         _number_re = re.compile(
             r"""
             (?P<number>
               (?P<mantissa>
                 (?P<integer1> [+-]?\d*)\.(?P<fraction>\d+)
                 |
                 (?P<integer2> [+-]?\d+)\.
               )
               (?:
                 [Ee]
                 (?P<exponent1> [+-]?\d+)
               )?
               |
               (?P<integer3> [+-]?\d+)
               (?:
                 [Ee]
                 (?P<exponent2> [+-]?\d+)
               )
             )
             """,
             re.VERBOSE,
         )
 
         def check_output(self, want: str, got: str, optionflags: int) -> bool:
-            if IPDoctestOutputChecker.check_output(self, want, got, optionflags):
+            if super().check_output(want, got, optionflags):
                 return True
 
             allow_unicode = optionflags & _get_allow_unicode_flag()
             allow_bytes = optionflags & _get_allow_bytes_flag()
             allow_number = optionflags & _get_number_flag()
 
             if not allow_unicode and not allow_bytes and not allow_number:
                 return False
 
             def remove_prefixes(regex: Pattern[str], txt: str) -> str:
                 return re.sub(regex, r"\1\2", txt)
 
             if allow_unicode:
                 want = remove_prefixes(self._unicode_literal_re, want)
                 got = remove_prefixes(self._unicode_literal_re, got)
 
             if allow_bytes:
                 want = remove_prefixes(self._bytes_literal_re, want)
                 got = remove_prefixes(self._bytes_literal_re, got)
 
             if allow_number:
                 got = self._remove_unwanted_precision(want, got)
 
-            return IPDoctestOutputChecker.check_output(self, want, got, optionflags)
+            return super().check_output(want, got, optionflags)
 
         def _remove_unwanted_precision(self, want: str, got: str) -> str:
             wants = list(self._number_re.finditer(want))
             gots = list(self._number_re.finditer(got))
             if len(wants) != len(gots):
                 return got
             offset = 0
             for w, g in zip(wants, gots):
                 fraction: Optional[str] = w.group("fraction")
                 exponent: Optional[str] = w.group("exponent1")
                 if exponent is None:
                     exponent = w.group("exponent2")
-                if fraction is None:
-                    precision = 0
-                else:
-                    precision = len(fraction)
+                precision = 0 if fraction is None else len(fraction)
                 if exponent is not None:
                     precision -= int(exponent)
                 if float(w.group()) == approx(float(g.group()), abs=10 ** -precision):
                     # They're close enough. Replace the text we actually
                     # got with the text we want, so that it will match when we
                     # check the string literally.
                     got = (
                         got[: g.start() + offset] + w.group() + got[g.end() + offset :]
                     )
                     offset += w.end() - w.start() - (g.end() - g.start())
             return got
 
     return LiteralsOutputChecker
 
 
 def _get_checker() -> "IPDoctestOutputChecker":
     """Return a IPDoctestOutputChecker subclass that supports some
     additional options:
 
     * ALLOW_UNICODE and ALLOW_BYTES options to ignore u'' and b''
       prefixes (respectively) in string literals. Useful when the same
       ipdoctest should run in Python 2 and Python 3.
 
     * NUMBER to ignore floating-point differences smaller than the
       precision of the literal number in the ipdoctest.
 
     An inner class is used to avoid importing "ipdoctest" at the module
     level.
     """
     global CHECKER_CLASS
     if CHECKER_CLASS is None:
         CHECKER_CLASS = _init_checker_class()
     return CHECKER_CLASS()
 
 
 def _get_allow_unicode_flag() -> int:
     """Register and return the ALLOW_UNICODE flag."""
     import doctest
 
     return doctest.register_optionflag("ALLOW_UNICODE")
 
 
 def _get_allow_bytes_flag() -> int:
     """Register and return the ALLOW_BYTES flag."""
     import doctest
 
     return doctest.register_optionflag("ALLOW_BYTES")
 
 
 def _get_number_flag() -> int:
     """Register and return the NUMBER flag."""
     import doctest
 
     return doctest.register_optionflag("NUMBER")
 
 
 def _get_report_choice(key: str) -> int:
     """Return the actual `ipdoctest` module flag value.
 
     We want to do it as late as possible to avoid importing `ipdoctest` and all
     its dependencies when parsing options, as it adds overhead and breaks tests.
     """
     import doctest
 
     return {
         DOCTEST_REPORT_CHOICE_UDIFF: doctest.REPORT_UDIFF,
         DOCTEST_REPORT_CHOICE_CDIFF: doctest.REPORT_CDIFF,
         DOCTEST_REPORT_CHOICE_NDIFF: doctest.REPORT_NDIFF,
         DOCTEST_REPORT_CHOICE_ONLY_FIRST_FAILURE: doctest.REPORT_ONLY_FIRST_FAILURE,
         DOCTEST_REPORT_CHOICE_NONE: 0,
     }[key]
 
 
 @pytest.fixture(scope="session")
 def ipdoctest_namespace() -> Dict[str, Any]:
     """Fixture that returns a :py:class:`dict` that will be injected into the
     namespace of ipdoctests."""
     return dict()