parameters: (self)
docstring: RI - Executes a reverse line feed: Move the cursor up one line to the
          home position.  If the cursor move would result in going past the top
          margin of the screen (upwards) this will execute a scroll_down() event.
docstring_summary: RI - Executes a reverse line feed: Move the cursor up one line to the
          home position.  If the cursor move would result in going past the top
          margin of the screen (upwards) this will execute a scroll_down() event.
docstring_tokens: RI - Executes a reverse line feed : Move the cursor up one line to the home position . If the cursor move would result in going past the top margin of the screen ( upwards ) this will execute a scroll_down () event .
function: def reverse_linefeed(self):
          """
          RI - Executes a reverse line feed: Move the cursor up one line to the
          home position.  If the cursor move would result in going past the top
          margin of the screen (upwards) this will execute a scroll_down() event.
          """
          self.cursorX = 0
          self.cursorY -= 1
          if self.cursorY < self.top_margin:
              self.scroll_down()
              self.cursorY = self.top_margin
function_tokens: def reverse_linefeed ( self ) : self . cursorX = 0 self . cursorY -= 1 if self . cursorY < self . top_margin : self . scroll_down ( ) self . cursorY = self . top_margin