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matplotlib.axes.Axes.set_ylabel
Axes.set_ylabel(ylabel, fontdict=None, labelpad=None, **kwargs)- 
    
Set the label for the yaxis
Parameters: ylabel : string
y label
labelpad : scalar, optional, default: None
spacing in points between the label and the x-axis
Other Parameters: kwargs :
TextpropertiesSee also
text- for information on how override and the optional args work
 
 
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 http://matplotlib.org/2.0.2/api/_as_gen/matplotlib.axes.Axes.set_ylabel.html