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matplotlib.axes.Axes.get_ylim
Axes.get_ylim(self)- 
    
Return the y-axis view limits.
Returns: - 
           
bottom, top(float, float) - 
           
The current y-axis limits in data coordinates.
 
See also
set_ylimset_ybound,get_yboundinvert_yaxis,yaxis_inverted
Notes
The y-axis may be inverted, in which case the bottom value will be greater than the top value.
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Examples using matplotlib.axes.Axes.get_ylim
  
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 https://matplotlib.org/3.2.2/api/_as_gen/matplotlib.axes.Axes.get_ylim.html