(self, picname=None)
Set background image or return name of current backgroundimage.

        Optional argument:
        picname -- a string, name of a gif-file or "nopic".

        If picname is a filename, set the corresponding image as background.
        If picname is "nopic", delete backgroundimage, if present.
        If picname is None, return the filename of the current backgroundimage.

        Example (for a TurtleScreen instance named screen):
        >>> screen.bgpic()
        'nopic'
        >>> screen.bgpic("landscape.gif")
        >>> screen.bgpic()
        'landscape.gif'
Set background image or return name of current backgroundimage.
Set background image or return name of current backgroundimage .
def bgpic(self, picname=None):
        """Set background image or return name of current backgroundimage.

        Optional argument:
        picname -- a string, name of a gif-file or "nopic".

        If picname is a filename, set the corresponding image as background.
        If picname is "nopic", delete backgroundimage, if present.
        If picname is None, return the filename of the current backgroundimage.

        Example (for a TurtleScreen instance named screen):
        >>> screen.bgpic()
        'nopic'
        >>> screen.bgpic("landscape.gif")
        >>> screen.bgpic()
        'landscape.gif'
        """
        if picname is None:
            return self._bgpicname
        if picname not in self._bgpics:
            self._bgpics[picname] = self._image(picname)
        self._setbgpic(self._bgpic, self._bgpics[picname])
        self._bgpicname = picname
def bgpic ( self , picname = None ) : if picname is None : return self . _bgpicname if picname not in self . _bgpics : self . _bgpics [ picname ] = self . _image ( picname ) self . _setbgpic ( self . _bgpic , self . _bgpics [ picname ] ) self . _bgpicname = picname