'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 : `~matplotlib.text.Text` properties
See also
text : for information on how override and the optional args work'

def set_ylabel(self, ylabel, fontdict=None, labelpad=None, **kwargs):

    if (labelpad is not None):
        self.yaxis.labelpad = labelpad
    return self.yaxis.set_label_text(ylabel, fontdict, **kwargs)
