parameters: (self, txt, indent=0)
docstring: Adds a line.
          
          The line can be indented with the optional argument 'indent'.
docstring_summary: Adds a line.
          
          The line can be indented with the optional argument 'indent'.
docstring_tokens: Adds a line . The line can be indented with the optional argument indent .
function: def add_line(self, txt, indent=0):
          """Adds a line.
          
          The line can be indented with the optional argument 'indent'.
          """
          
          self.add(txt+'\n', indent)
function_tokens: def add_line ( self , txt , indent = 0 ) : self . add ( txt + '\n' , indent )