diff --git a/Lib/test/test__xxsubinterpreters.py b/Lib/test/test__xxsubinterpreters.py
@@ -25,11 +25,11 @@ def _captured_script(script):
    indented = script.replace('\n', '\n                ')
    wrapped = dedent(f"""
        import contextlib
-        with open({w}, 'w') as spipe:
            with contextlib.redirect_stdout(spipe):
                {indented}
        """)
-    return wrapped, open(r)


def _run_output(interp, request, shared=None):
@@ -45,7 +45,7 @@ def _running(interp):
    def run():
        interpreters.run_string(interp, dedent(f"""
            # wait for "signal"
-            with open({r}) as rpipe:
                rpipe.read()
            """))

@@ -54,7 +54,7 @@ def run():

    yield

-    with open(w, 'w') as spipe:
        spipe.write('done')
    t.join()

@@ -806,7 +806,7 @@ def f():
    @unittest.skipUnless(hasattr(os, 'fork'), "test needs os.fork()")
    def test_fork(self):
        import tempfile
-        with tempfile.NamedTemporaryFile('w+') as file:
            file.write('')
            file.flush()

@@ -816,7 +816,7 @@ def test_fork(self):
                try:
                    os.fork()
                except RuntimeError:
-                    with open('{file.name}', 'w') as out:
                        out.write('{expected}')
                """)
            interpreters.run_string(self.id, script)

diff --git a/Lib/test/test_argparse.py b/Lib/test/test_argparse.py
@@ -45,7 +45,7 @@ def tearDown(self):

    def create_readonly_file(self, filename):
        file_path = os.path.join(self.temp_dir, filename)
-        with open(file_path, 'w') as file:
            file.write(filename)
        os.chmod(file_path, stat.S_IREAD)

@@ -1468,7 +1468,7 @@ def setUp(self):
            ('invalid', '@no-such-path\n'),
        ]
        for path, text in file_texts:
-            with open(path, 'w') as file:
                file.write(text)

    parser_signature = Sig(fromfile_prefix_chars='@')
@@ -1498,7 +1498,7 @@ def setUp(self):
            ('hello', 'hello world!\n'),
        ]
        for path, text in file_texts:
-            with open(path, 'w') as file:
                file.write(text)

    class FromFileConverterArgumentParser(ErrorRaisingArgumentParser):
@@ -1580,7 +1580,8 @@ class TestFileTypeR(TempDirMixin, ParserTestCase):
    def setUp(self):
        super(TestFileTypeR, self).setUp()
        for file_name in ['foo', 'bar']:
-            with open(os.path.join(self.temp_dir, file_name), 'w') as file:
                file.write(file_name)
        self.create_readonly_file('readonly')

@@ -1601,7 +1602,7 @@ class TestFileTypeDefaults(TempDirMixin, ParserTestCase):
    """Test that a file is not created unless the default is needed"""
    def setUp(self):
        super(TestFileTypeDefaults, self).setUp()
-        file = open(os.path.join(self.temp_dir, 'good'), 'w')
        file.write('good')
        file.close()

@@ -1620,7 +1621,8 @@ class TestFileTypeRB(TempDirMixin, ParserTestCase):
    def setUp(self):
        super(TestFileTypeRB, self).setUp()
        for file_name in ['foo', 'bar']:
-            with open(os.path.join(self.temp_dir, file_name), 'w') as file:
                file.write(file_name)

    argument_signatures = [

diff --git a/Lib/test/test_baseexception.py b/Lib/test/test_baseexception.py
@@ -28,8 +28,9 @@ def test_inheritance(self):
            except TypeError:
                pass

-        inheritance_tree = open(os.path.join(os.path.split(__file__)[0],
-                                                'exception_hierarchy.txt'))
        try:
            superclass_name = inheritance_tree.readline().rstrip()
            try:

diff --git a/Lib/test/test_bdb.py b/Lib/test/test_bdb.py
@@ -539,7 +539,7 @@ def create_modules(modules):
        try:
            for m in modules:
                fname = m + '.py'
-                with open(fname, 'w') as f:
                    f.write(textwrap.dedent(modules[m]))
                linecache.checkcache(fname)
            importlib.invalidate_caches()

diff --git a/Lib/test/test_bool.py b/Lib/test/test_bool.py
@@ -235,7 +235,7 @@ def test_boolean(self):

    def test_fileclosed(self):
        try:
-            with open(os_helper.TESTFN, "w") as f:
                self.assertIs(f.closed, False)
            self.assertIs(f.closed, True)
        finally:

diff --git a/Lib/test/test_doctest.py b/Lib/test/test_doctest.py
@@ -2846,7 +2846,7 @@ def test_CLI(): r"""
    >>> from test.support.os_helper import temp_dir
    >>> with temp_dir() as tmpdir:
    ...     fn = os.path.join(tmpdir, 'myfile.doc')
-    ...     with open(fn, 'w') as f:
    ...         _ = f.write('This is a very simple test file.\n')
    ...         _ = f.write('   >>> 1 + 1\n')
    ...         _ = f.write('   2\n')
@@ -2898,7 +2898,7 @@ def test_CLI(): r"""
    >>> from test.support.os_helper import temp_dir
    >>> with temp_dir() as tmpdir:
    ...     fn = os.path.join(tmpdir, 'myfile.doc')
-    ...     with open(fn, 'w') as f:
    ...         _ = f.write('This is another simple test file.\n')
    ...         _ = f.write('   >>> 1 + 1\n')
    ...         _ = f.write('   2\n')
@@ -2909,7 +2909,7 @@ def test_CLI(): r"""
    ...         _ = f.write('\n')
    ...         _ = f.write('And that is it.\n')
    ...     fn2 = os.path.join(tmpdir, 'myfile2.py')
-    ...     with open(fn2, 'w') as f:
    ...         _ = f.write('def test_func():\n')
    ...         _ = f.write('   \"\"\"\n')
    ...         _ = f.write('   This is simple python test function.\n')

diff --git a/Lib/test/test_exceptions.py b/Lib/test/test_exceptions.py
@@ -54,9 +54,9 @@ def testRaising(self):
        self.assertRaises(AttributeError, getattr, sys, "undefined_attribute")

        self.raise_catch(EOFError, "EOFError")
-        fp = open(TESTFN, 'w')
        fp.close()
-        fp = open(TESTFN, 'r')
        savestdin = sys.stdin
        try:
            try:

diff --git a/Parser/asdl.py b/Parser/asdl.py
@@ -204,7 +204,7 @@ def check(mod):

def parse(filename):
    """Parse ASDL from the given file and return a Module node describing it."""
-    with open(filename) as f:
        parser = ASDLParser()
        return parser.parse(f.read())