def findobj(self, match=None, include_self=True):
        """
        Find artist objects.

        pyplot signature:
          findobj(o=gcf(), match=None, include_self=True)

        Recursively find all :class:matplotlib.artist.Artist instances
        contained in self.

        *match* can be

          - None: return all objects contained in artist.

          - function with signature ``boolean = match(artist)``
            used to filter matches

          - class instance: eg Line2D.  Only return artists of class type.

        If *include_self* is True (default), include self in the list to be
        checked for a match.

        .. plot:: mpl_examples/pylab_examples/findobj_demo.py
        """

        if match is None:  # always return True
            def matchfunc(x):
                return True
        elif cbook.issubclass_safe(match, Artist):
            def matchfunc(x):
                return isinstance(x, match)
        elif isinstance(match, collections.Callable):
            matchfunc = match
        else:
            raise ValueError('match must be None, a matplotlib.artist.Artist '
                             'subclass, or a callable')

        artists = []

        for c in self.get_children():
            if matchfunc(c):
                artists.append(c)
            artists.extend([thisc for thisc in
                                c.findobj(matchfunc, include_self=False)
                                                     if matchfunc(thisc)])

        if include_self and matchfunc(self):
            artists.append(self)
        return artists

    def findobj(self, match=None, include_self=True):
        """
        Find artist objects.

        Recursively find all :class:`~matplotlib.artist.Artist` instances
        contained in self.

        *match* can be

          - None: return all objects contained in artist.

          - function with signature ``boolean = match(artist)``
            used to filter matches

          - class instance: e.g., Line2D.  Only return artists of class type.

        If *include_self* is True (default), include self in the list to be
        checked for a match.

        """
        if match is None:  # always return True

            def matchfunc(x):
                return True

        elif cbook.issubclass_safe(match, Artist):

            def matchfunc(x):
                return isinstance(x, match)

        elif six.callable(match):
            matchfunc = match
        else:
            raise ValueError("match must be None, a matplotlib.artist.Artist " "subclass, or a callable")

        artists = []

        for c in self.get_children():
            if matchfunc(c):
                artists.append(c)
            artists.extend([thisc for thisc in c.findobj(matchfunc, include_self=False) if matchfunc(thisc)])

        if include_self and matchfunc(self):
            artists.append(self)
        return artists