Python错误集锦：matplotlib legend提示：ValueError: Unrecognized location ‘upper’. Valid locations are

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错误提示：

使用matplotlib legend提示：ValueError: Unrecognized location ‘upper’. Valid locations are

Traceback (most recent call last):
  File "09-plt-step.py", line 30, in 
    plt.legend(title='参数where:',fontsize='xx-small',loc='upper')
  File "D:\Python\Python38\lib\site-packages\matplotlib\pyplot.py", line 2738, in legend
    return gca().legend(*args, **kwargs)
  File "D:\Python\Python38\lib\site-packages\matplotlib\axes\_axes.py", line 417, in legend
    self.legend_ = mlegend.Legend(self, handles, labels, **kwargs)
  File "D:\Python\Python38\lib\site-packages\matplotlib\legend.py", line 455, in __init__
    raise ValueError(
ValueError: Unrecognized location 'upper'. Valid locations are
        best
        upper right
        upper left
        lower left
        lower right
        right
        center left
        center right
        lower center
        upper center
        center

可能原因：

1、使用matplotlib的legend图例说明是，说明位置参数loc=’upper’非法，没有’upper’类型的位置值

解决方法：

1、通过错误提示找到合法的位置值，可以使用下面这些字符串表示的位置，比如upper right表示右上角：

        best
        upper right
        upper left
        lower left
        lower right
        right
        center left
        center right
        lower center
        upper center
        center