parameters: (self, item)
return_statement: return self.tk.call(self._w, "prev", item)
docstring: Returns the identifier of item's previous sibling, or '' if
          item is the first child of its parent.
docstring_summary: Returns the identifier of item's previous sibling, or '' if
          item is the first child of its parent.
docstring_tokens: Returns the identifier of item s previous sibling or if item is the first child of its parent .
function: def prev(self, item):
          """Returns the identifier of item's previous sibling, or '' if
          item is the first child of its parent."""
          return self.tk.call(self._w, "prev", item)
function_tokens: def prev ( self , item ) : return self . tk . call ( self . _w , "prev" , item )