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matplotlib.axis.YAxis.get_ticklabels
YAxis.get_ticklabels(minor=False, which=None)- 
    
Get the x tick labels as a list of
Textinstances.Parameters: minor : bool
If True return the minor ticklabels, else return the major ticklabels
which : None, (‘minor’, ‘major’, ‘both’)
Overrides
minor.Selects which ticklabels to return
Returns: ret : list
List of
Textinstances. 
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 http://matplotlib.org/2.0.2/api/_as_gen/matplotlib.axis.YAxis.get_ticklabels.html