parameters: (self, tagName, belowThis=None)
docstring: Change the priority of tag TAGNAME such that it is lower
          than the priority of BELOWTHIS.
docstring_summary: Change the priority of tag TAGNAME such that it is lower
          than the priority of BELOWTHIS.
docstring_tokens: Change the priority of tag TAGNAME such that it is lower than the priority of BELOWTHIS .
function: def tag_lower(self, tagName, belowThis=None):
          """Change the priority of tag TAGNAME such that it is lower
          than the priority of BELOWTHIS."""
          self.tk.call(self._w, 'tag', 'lower', tagName, belowThis)
function_tokens: def tag_lower ( self , tagName , belowThis = None ) : self . tk . call ( self . _w , 'tag' , 'lower' , tagName , belowThis )