parameters: (body, pos)
return_statement: return {'start': start, 'end': end, 'line': line}
docstring: Retrieve the start and end positions and value for the line immediately
      before the line containing the specified position.
docstring_summary: Retrieve the start and end positions and value for the line immediately
      before the line containing the specified position.
docstring_tokens: Retrieve the start and end positions and value for the line immediately before the line containing the specified position .
function: def get_prev_line(body, pos):
    """ Retrieve the start and end positions and value for the line immediately
      before the line containing the specified position.
      """
    end = body.rfind('\n', 0, pos)
    start = body.rfind('\n', 0, end) + 1
    line = body[start:end]
    return {'start': start, 'end': end, 'line': line}
function_tokens: def get_prev_line ( body , pos ) : end = body . rfind ( '\n' , 0 , pos ) start = body . rfind ( '\n' , 0 , end ) + 1 line = body [ start : end ] return { 'start' : start , 'end' : end , 'line' : line }