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我有下面的函数（saveFigure），当我运行 x 是日期的独立实例时，它可以正常工作，而 x 是时间的其他实例。

但是在一个 python 实例中，如果我使用 x 作为日期然后 x 作为时间调用此函数，则会收到以下错误：

  plt.savefig(param.location + os.sep + param.fileName + str(dim) + '.png')
  File "C:\Anaconda\lib\site-packages\matplotlib\pyplot.py", line 472, in savefig
    return fig.savefig(*args, **kwargs)
  File "C:\Anaconda\lib\site-packages\matplotlib\figure.py", line 1370, in savefig
    self.canvas.print_figure(*args, **kwargs)
  File "C:\Anaconda\lib\site-packages\matplotlib\backends\backend_qt4agg.py", line 161, in print_figure
    FigureCanvasAgg.print_figure(self, *args, **kwargs)
  File "C:\Anaconda\lib\site-packages\matplotlib\backend_bases.py", line 2096, in print_figure
    **kwargs)
  File "C:\Anaconda\lib\site-packages\matplotlib\backends\backend_agg.py", line 492, in print_png
    FigureCanvasAgg.draw(self)
  File "C:\Anaconda\lib\site-packages\matplotlib\backends\backend_agg.py", line 440, in draw
    self.figure.draw(self.renderer)
  File "C:\Anaconda\lib\site-packages\matplotlib\artist.py", line 54, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "C:\Anaconda\lib\site-packages\matplotlib\figure.py", line 1006, in draw
    func(*args)
  File "C:\Anaconda\lib\site-packages\matplotlib\artist.py", line 54, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "C:\Anaconda\lib\site-packages\matplotlib\axes.py", line 2086, in draw
    a.draw(renderer)
  File "C:\Anaconda\lib\site-packages\matplotlib\artist.py", line 54, in draw_wrapper
    draw(artist, renderer, *args, **kwargs)
  File "C:\Anaconda\lib\site-packages\matplotlib\axis.py", line 1050, in draw
    ticks_to_draw = self._update_ticks(renderer)
  File "C:\Anaconda\lib\site-packages\matplotlib\axis.py", line 937, in _update_ticks
    tick_tups = [t for t in self.iter_ticks()]
  File "C:\Anaconda\lib\site-packages\matplotlib\axis.py", line 881, in iter_ticks
    majorLocs = self.major.locator()
  File "C:\Anaconda\lib\site-packages\matplotlib\ticker.py", line 897, in __call__
    raise NotImplementedError('Derived must override')
NotImplementedError: Derived must override


def saveFigure(self, df, x, y, param, dim, timeBased):

        ax = plt.subplot(111)                           
        ax.bar(x, y)                          

        if hasattr(param, 'title'):
            ax.set_title(param.title)

        if hasattr(param, 'ylabel'):            
            if hasattr(param.ylabel, '__iter__') and dim < len(param.ylabel):
                ax.set_ylabel(param.ylabel[dim])
            else:
                ax.set_ylabel(param.ylabel)

        if hasattr(param, 'xlabel'):
            ax.set_xlabel(param.xlabel)        

        plt.gcf().autofmt_xdate()


        plt.savefig(param.location + os.sep + param.fileName + str(dim) + '.png')
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