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matplotlib.axes.Axes.invert_yaxis
Axes.invert_yaxis(self)- 
    
Invert the y-axis.
See also
yaxis_invertedget_ylim,set_ylimget_ybound,set_ybound
 
Examples using matplotlib.axes.Axes.invert_yaxis
  
  
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 https://matplotlib.org/3.2.2/api/_as_gen/matplotlib.axes.Axes.invert_yaxis.html