How to use the anyconfig.api.open function in anyconfig

def _load_and_dump_with_opened_files(self, filename, rmode='r', wmode='w',
                                         **oopts):
        cpath = os.path.join(self.workdir, filename)

        with TT.open(cpath, 'w', **oopts) as out:
            TT.dump(self.cnf, out)
            self.assertTrue(_is_file_object(out))
            self.assertEqual(out.mode, wmode)

        with TT.open(cpath, 'rb', **oopts) as inp:
            cnf1 = TT.single_load(inp)
            self.assertTrue(_is_file_object(inp))
            self.assertEqual(inp.mode, rmode)
            cpair = (self.cnf, cnf1)
            self.assertTrue(dicts_equal(*cpair), "%r vs. %r" % cpair)

def test_30_dump_and_multi_load__to_from_stream(self):
        TT.dump(self.dic, self.a_path)
        TT.dump(self.upd, self.b_path)

        res = TT.multi_load([TT.open(self.a_path), TT.open(self.b_path)])
        self.assert_dicts_equal(res, self.exp)

def test_11_dump_and_single_load__to_from_stream(self):
        TT.dump(self.cnf, TT.open(self.a_path, mode='w'))
        self.assertTrue(os.path.exists(self.a_path))

        res = TT.single_load(TT.open(self.a_path))
        self.assert_dicts_equal(res, self.cnf)

def _load_and_dump_with_opened_files(self, filename, rmode='r', wmode='w',
                                         **oopts):
        cpath = os.path.join(self.workdir, filename)

        with TT.open(cpath, 'w', **oopts) as out:
            TT.dump(self.cnf, out)
            self.assertTrue(_is_file_object(out))
            self.assertEqual(out.mode, wmode)

        with TT.open(cpath, 'rb', **oopts) as inp:
            cnf1 = TT.single_load(inp)
            self.assertTrue(_is_file_object(inp))
            self.assertEqual(inp.mode, rmode)
            cpair = (self.cnf, cnf1)
            self.assertTrue(dicts_equal(*cpair), "%r vs. %r" % cpair)

def test_15_single_load__fail_to_render_template(self):
        if not anyconfig.template.SUPPORTED:
            return

        cnf_s = "name: '{{ name'"  # Should cause template renering error.
        cpath = os.path.join(self.workdir, "a.yaml")
        TT.open(cpath, mode='w').write(cnf_s)

        cnf = TT.single_load(cpath, ac_template=True, ac_context=dict(a=1))
        self.assertEqual(cnf["name"], "{{ name")

def test_11_dump_and_single_load__to_from_stream(self):
        TT.dump(self.cnf, TT.open(self.a_path, mode='w'))
        self.assertTrue(os.path.exists(self.a_path))

        res = TT.single_load(TT.open(self.a_path))
        self.assert_dicts_equal(res, self.cnf)

def test_31_dump_and_load__to_from_stream(self):
        with TT.open(self.a_path, mode='w') as strm:
            TT.dump(self.dic, strm)

        self.assertTrue(os.path.exists(self.a_path))

        with TT.open(self.a_path) as strm:
            res = TT.load(strm, ac_parser="json")
            self.assert_dicts_equal(res, self.dic)