How to use the snoop.utils.ensure_tuple function in snoop

def __init__(
            self,
            watch=(),
            watch_explode=(),
            depth=1,
    ):
        self.watch = [
            v if isinstance(v, BaseVariable) else CommonVariable(v)
            for v in ensure_tuple(watch)
        ] + [
            v if isinstance(v, BaseVariable) else Exploding(v)
            for v in ensure_tuple(watch_explode)
        ]
        self.frame_infos = ArgDefaultDict(FrameInfo)
        self.depth = depth
        assert self.depth >= 1
        self.target_codes = set()
        self.target_frames = set()

def __init__(
            self,
            watch=(),
            watch_explode=(),
            depth=1,
    ):
        self.watch = [
            v if isinstance(v, BaseVariable) else CommonVariable(v)
            for v in ensure_tuple(watch)
        ] + [
            v if isinstance(v, BaseVariable) else Exploding(v)
            for v in ensure_tuple(watch_explode)
        ]
        self.frame_infos = ArgDefaultDict(FrameInfo)
        self.depth = depth
        assert self.depth >= 1
        self.target_codes = set()
        self.target_frames = set()

self.write = get_write_function(out, overwrite)
        self.formatter = formatter_class(prefix, columns, color)
        self.enabled = enabled
        self.pp = PP(self)

        class ConfiguredTracer(Tracer):
            config = self

        self.snoop = ConfiguredTracer
        self.spy = Spy(self)

        self.last_frame = None
        self.thread_local = threading.local()

        if replace_watch_extras is not None:
            self.watch_extras = ensure_tuple(replace_watch_extras)
        else:
            self.watch_extras = (len_shape_watch, dtype_watch) + ensure_tuple(watch_extras)

def __init__(self, prefix, columns, color):
        prefix = six.text_type(prefix)
        if prefix and prefix == prefix.rstrip():
            prefix += u' '
        self.prefix = prefix
        self.columns = [
            column if callable(column) else
            getattr(self, u'{}_column'.format(column))
            for column in ensure_tuple(columns, split=True)
        ]
        self.column_widths = dict.fromkeys(self.columns, 0)
        if color is True:
            color = NeutralMonokaiStyle
        if color:
            self.c = Colors
            self.c.grey = formatters[color].style_string["Token.Comment"][0]

            def highlighted(code):
                return cached_highlight(code, color)

            def highlighted_source_line(event):
                return event.source.highlighted[color][event.line_no - 1]
        else:
            self.c = NoColors()

def __init__(self, source, exclude=()):
        self.source = source
        self.exclude = ensure_tuple(exclude)
        self.code = compile(source, '', 'eval')
        self.unambiguous_source = with_needed_parentheses(source)

def __init__(
            self,
            watch=(),
            watch_explode=(),
            depth=1,
    ):
        self.watch = [
            v if isinstance(v, BaseVariable) else CommonVariable(v)
            for v in ensure_tuple(watch)
        ] + [
            v if isinstance(v, BaseVariable) else Exploding(v)
            for v in ensure_tuple(watch_explode)
        ]
        self.frame_infos = ArgDefaultDict(FrameInfo)
        self.depth = depth
        assert self.depth >= 1
        self.target_codes = set()
        self.target_frames = set()
        self.variable_whitelist = None

def __init__(
            self,
            watch=(),
            watch_explode=(),
            depth=1,
    ):
        self.watch = [
            v if isinstance(v, BaseVariable) else CommonVariable(v)
            for v in ensure_tuple(watch)
        ] + [
            v if isinstance(v, BaseVariable) else Exploding(v)
            for v in ensure_tuple(watch_explode)
        ]
        self.frame_infos = ArgDefaultDict(FrameInfo)
        self.depth = depth
        assert self.depth >= 1
        self.target_codes = set()
        self.target_frames = set()
        self.variable_whitelist = None

self.enabled = enabled
        self.pp = PP(self)

        class ConfiguredTracer(Tracer):
            config = self

        self.snoop = ConfiguredTracer
        self.spy = Spy(self)

        self.last_frame = None
        self.thread_local = threading.local()

        if replace_watch_extras is not None:
            self.watch_extras = ensure_tuple(replace_watch_extras)
        else:
            self.watch_extras = (len_shape_watch, dtype_watch) + ensure_tuple(watch_extras)

def __init__(self, prefix, columns, color):
        prefix = six.text_type(prefix)
        if prefix and prefix == prefix.rstrip():
            prefix += ' '
        self.prefix = prefix
        self.columns = [
            column if callable(column) else
            getattr(self, '{}_column'.format(column))
            for column in ensure_tuple(columns, split=True)
        ]
        self.column_widths = dict.fromkeys(self.columns, 0)
        if color is True:
            color = NeutralMonokaiStyle
        if color:
            self.c = Colors

            def highlighted(code):
                return cached_highlight(code, color)

            def highlighted_source_line(event):
                return event.source.highlighted[color][event.line_no - 1]
        else:
            self.c = NoColors()

            def highlighted(code):