How to use the pybind11.tools.clang.cindex.SourceRange function in pybind11

start_location = SourceLocation.from_position(self, f,
                start_location[0], start_location[1])
        elif isinstance(start_location, int):
            start_location = SourceLocation.from_offset(self, f,
                start_location)

        if hasattr(end_location, '__len__'):
            end_location = SourceLocation.from_position(self, f,
                end_location[0], end_location[1])
        elif isinstance(end_location, int):
            end_location = SourceLocation.from_offset(self, f, end_location)

        assert isinstance(start_location, SourceLocation)
        assert isinstance(end_location, SourceLocation)

        return SourceRange.from_locations(start_location, end_location)

("clang_getDiagnostic",
   [c_object_p, c_uint],
   c_object_p),

  ("clang_getDiagnosticCategory",
   [Diagnostic],
   c_uint),

  ("clang_getDiagnosticCategoryText",
   [Diagnostic],
   _CXString,
   _CXString.from_result),

  ("clang_getDiagnosticFixIt",
   [Diagnostic, c_uint, POINTER(SourceRange)],
   _CXString,
   _CXString.from_result),

  ("clang_getDiagnosticInSet",
   [c_object_p, c_uint],
   c_object_p),

  ("clang_getDiagnosticLocation",
   [Diagnostic],
   SourceLocation),

  ("clang_getDiagnosticNumFixIts",
   [Diagnostic],
   c_uint),

  ("clang_getDiagnosticNumRanges",

def __getitem__(self, key):
                range = SourceRange()
                value = conf.lib.clang_getDiagnosticFixIt(self.diag, key,
                        byref(range))
                if len(value) == 0:
                    raise IndexError

                return FixIt(range, value)

def get_tokens(self, locations=None, extent=None):
        """Obtain tokens in this translation unit.

        This is a generator for Token instances. The caller specifies a range
        of source code to obtain tokens for. The range can be specified as a
        2-tuple of SourceLocation or as a SourceRange. If both are defined,
        behavior is undefined.
        """
        if locations is not None:
            extent = SourceRange(start=locations[0], end=locations[1])

        return TokenGroup.get_tokens(self, extent)

bool),

  ("clang_parseTranslationUnit",
   [Index, c_char_p, c_void_p, c_int, c_void_p, c_int, c_int],
   c_object_p),

  ("clang_reparseTranslationUnit",
   [TranslationUnit, c_int, c_void_p, c_int],
   c_int),

  ("clang_saveTranslationUnit",
   [TranslationUnit, c_char_p, c_uint],
   c_int),

  ("clang_tokenize",
   [TranslationUnit, SourceRange, POINTER(POINTER(Token)), POINTER(c_uint)]),

  ("clang_visitChildren",
   [Cursor, callbacks['cursor_visit'], py_object],
   c_uint),

  ("clang_Cursor_getNumArguments",
   [Cursor],
   c_int),

  ("clang_Cursor_getArgument",
   [Cursor, c_uint],
   Cursor,
   Cursor.from_result),

  ("clang_Cursor_getNumTemplateArguments",
   [Cursor],