How to use the jedi._compatibility.force_unicode function in jedi

def _get_forward_reference_node(context, string):
    try:
        new_node = context.inference_state.grammar.parse(
            force_unicode(string),
            start_symbol='eval_input',
            error_recovery=False
        )
    except ParserSyntaxError:
        debug.warning('Annotation not parsed: %s' % string)
        return None
    else:
        module = context.tree_node.get_root_node()
        parser_utils.move(new_node, module.end_pos[0])
        new_node.parent = context.tree_node
        return new_node

value_set = lazy_value.infer()
        if not value_set:
            return None
        if len(value_set) > 1:
            debug.warning('Found multiple values for a type variable: %s', value_set)

        name_value = next(iter(value_set))
        try:
            method = name_value.get_safe_value
        except AttributeError:
            return None
        else:
            safe_value = method(default=None)
            if self.inference_state.environment.version_info.major == 2:
                if isinstance(safe_value, bytes):
                    return force_unicode(safe_value)
            if isinstance(safe_value, (str, unicode)):
                return safe_value
            return None

def _parse_function_doc(doc):
    """
    Takes a function and returns the params and return value as a tuple.
    This is nothing more than a docstring parser.

    TODO docstrings like utime(path, (atime, mtime)) and a(b [, b]) -> None
    TODO docstrings like 'tuple of integers'
    """
    doc = force_unicode(doc)
    # parse round parentheses: def func(a, (b,c))
    try:
        count = 0
        start = doc.index('(')
        for i, s in enumerate(doc[start:]):
            if s == '(':
                count += 1
            elif s == ')':
                count -= 1
            if count == 0:
                end = start + i
                break
        param_str = doc[start + 1:end]
    except (ValueError, UnboundLocalError):
        # ValueError for doc.index
        # UnboundLocalError for undefined end in last line

def _bool_to_context(evaluator, bool_):
    return compiled.builtin_from_name(evaluator, force_unicode(str(bool_)))

def _eval_comparison_part(evaluator, context, left, operator, right):
    l_is_num = is_number(left)
    r_is_num = is_number(right)
    if isinstance(operator, unicode):
        str_operator = operator
    else:
        str_operator = force_unicode(str(operator.value))

    if str_operator == '*':
        # for iterables, ignore * operations
        if isinstance(left, iterable.Sequence) or is_string(left):
            return ContextSet([left])
        elif isinstance(right, iterable.Sequence) or is_string(right):
            return ContextSet([right])
    elif str_operator == '+':
        if l_is_num and r_is_num or is_string(left) and is_string(right):
            return ContextSet([left.execute_operation(right, str_operator)])
        elif _is_tuple(left) and _is_tuple(right) or _is_list(left) and _is_list(right):
            return ContextSet([iterable.MergedArray(evaluator, (left, right))])
    elif str_operator == '-':
        if l_is_num and r_is_num:
            return ContextSet([left.execute_operation(right, str_operator)])
    elif str_operator == '%':

def _parse_function_doc(doc):
    """
    Takes a function and returns the params and return value as a tuple.
    This is nothing more than a docstring parser.

    TODO docstrings like utime(path, (atime, mtime)) and a(b [, b]) -> None
    TODO docstrings like 'tuple of integers'
    """
    doc = force_unicode(doc)
    # parse round parentheses: def func(a, (b,c))
    try:
        count = 0
        start = doc.index('(')
        for i, s in enumerate(doc[start:]):
            if s == '(':
                count += 1
            elif s == ')':
                count -= 1
            if count == 0:
                end = start + i
                break
        param_str = doc[start + 1:end]
    except (ValueError, UnboundLocalError):
        # ValueError for doc.index
        # UnboundLocalError for undefined end in last line

def _get_forward_reference_node(context, string):
    try:
        new_node = context.evaluator.grammar.parse(
            force_unicode(string),
            start_symbol='eval_input',
            error_recovery=False
        )
    except ParserSyntaxError:
        debug.warning('Annotation not parsed: %s' % string)
        return None
    else:
        module = context.tree_node.get_root_node()
        parser_utils.move(new_node, module.end_pos[0])
        new_node.parent = context.tree_node
        return new_node

def _add_strings(context, nodes, add_slash=False):
    string = ''
    first = True
    for child_node in nodes:
        values = context.infer_node(child_node)
        if len(values) != 1:
            return None
        c, = values
        s = get_str_or_none(c)
        if s is None:
            return None
        if not first and add_slash:
            string += os.path.sep
        string += force_unicode(s)
        first = False
    return string

def list_module_names(inference_state, search_path):
    return [
        force_unicode(name)
        for module_loader, name, is_pkg in iter_modules(search_path)
    ]

def sys_path_with_modifications(self):

        sys_path_mod = (
            self._evaluator.get_sys_path()
            + sys_path.check_sys_path_modifications(self.module_context)
        )

        if self.import_path and self.file_path is not None \
                and self._evaluator.environment.version_info.major == 2:
            # Python2 uses an old strange way of importing relative imports.
            sys_path_mod.append(force_unicode(os.path.dirname(self.file_path)))

        return sys_path_mod