python用matplotlib画子图（每个子图有三条颜色），颜色设置报错

Question

我的问题是：

使用python,用pandas读取数据，matplotlib画2行1列的子图

想要给两个子图中的线条设置颜色（每个子图有三条线），结果报错

附上我的代码和具体报错：

代码如下：

造成报错的地方，在下面第4行和第9行，已经加粗，求教我错在哪里，应该怎么修改

data = df['采集时间']

fig = plt.figure()

ax1 = fig.add_subplot(211)

ax1.plot(df['时间'],df[['1','2','3']],linewidth = 2,marker = '.',c=['r','g','b'])

ax1.set_title('走势图1')

plt.xticks(range(0,len(data),4))

ax1.set_xticklabels(data[::4])

ax2 = fig.add_subplot(212)

ax2.plot(df['时间'],df[['4','5','6']],linewidth = 2,marker = '.',c=['r','g','b'])

ax2.set_title('走势图2')

plt.xticks(range(0,len(data),4))

ax2.set_xticklabels(data[::4])

plt.rcParams['font.sans-serif']=['SimHei']  # 显示中文标签

plt.subplots_adjust(hspace = 0.4)           # 设置两个图之间的间距

报错如下：

Traceback (most recent call last):

  File "g:/Python/绘图测试.py", line 32, in <module>

    plt.savefig(buffer)  

  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\pyplot.py", line 722, in savefig

    res = fig.savefig(*args, **kwargs)

  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\figure.py", line 2180, in savefig

    self.canvas.print_figure(fname, **kwargs)

  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\backend_bases.py", line 2082, in 

print_figure

    **kwargs)

  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\backends\backend_agg.py", line 527, in print_png

    FigureCanvasAgg.draw(self)

  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\backends\backend_agg.py", line 388, in draw

    self.figure.draw(self.renderer)

  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\artist.py", line 38, in draw_wrapper

    return draw(artist, renderer, *args, **kwargs)

  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\figure.py", line 1709, in draw   

    renderer, self, artists, self.suppressComposite)

  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\image.py", line 135, in _draw_list_compositing_images

    a.draw(renderer)

  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\artist.py", line 38, in draw_wrapper

    return draw(artist, renderer, *args, **kwargs)

  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\axes\_base.py", line 2647, in draw

    mimage._draw_list_compositing_images(renderer, self, artists)

  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\image.py", line 135, in _draw_list_compositing_images

    a.draw(renderer)

  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\artist.py", line 38, in draw_wrapper

    return draw(artist, renderer, *args, **kwargs)

  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\lines.py", line 783, in draw     

    lc_rgba = mcolors.to_rgba(self._color, self._alpha)

  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\colors.py", line 177, in to_rgba 

    rgba = _to_rgba_no_colorcycle(c, alpha)

  File "C:\Users\Administrator\AppData\Local\Programs\Python\Python36\lib\site-packages\matplotlib\colors.py", line 240, in _to_rgba_no_colorcycle

    raise ValueError("Invalid RGBA argument: {!r}".format(orig_c))

ValueError: Invalid RGBA argument: ['r', 'g', 'b']

Answer 1

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Answer 2

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Answer 3

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