code: def maybe_center_plot(result):
      
      begin = re.search('(% .* matplotlib2tikz v.*)', result)
      if begin:
          result = ('\\begin{center}\n' + result[begin.end():] +
                    '\n\\end{center}')
      return result
docs: Embeds a possible tikz image inside a center environment.
  
      Searches for matplotlib2tikz last commend line to detect tikz images.
  
      Args:
          result: The code execution result
  
      Returns:
          The input result if no tikzpicture was found, otherwise a centered
          version.