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matplotlib.axes.Axes.locator_params
Axes.locator_params(axis='both', tight=None, **kwargs)- 
    
Control behavior of tick locators.
Keyword arguments:
- axis
 - [‘x’ | ‘y’ | ‘both’] Axis on which to operate; default is ‘both’.
 - tight
 - 
      [True | False | None] Parameter passed to 
autoscale_view(). Default is None, for no change. 
Remaining keyword arguments are passed to directly to the
set_params()method.Typically one might want to reduce the maximum number of ticks and use tight bounds when plotting small subplots, for example:
ax.locator_params(tight=True, nbins=4)Because the locator is involved in autoscaling,
autoscale_view()is called automatically after the parameters are changed.This presently works only for the
MaxNLocatorused by default on linear axes, but it may be generalized. 
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 http://matplotlib.org/2.0.2/api/_as_gen/matplotlib.axes.Axes.locator_params.html