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Set the theta gridlines in a polar plot.
Parameters
----------
angles : tuple with floats, degrees
The angles of the theta gridlines.
labels : tuple with strings or None
The labels to use at each theta gridline. The
`.projections.polar.ThetaFormatter` will be used if None.
fmt : str or None
Format string used in `matplotlib.ticker.FormatStrFormatter`.
For example '%f'. Note that the angle that is used is in
radians.
Returns
-------
lines : list of `.lines.Line2D`
The theta gridlines.
labels : list of `.text.Text`
The tick labels.
Other Parameters
----------------
**kwargs
*kwargs* are optional `.Text` properties for the labels.
.. warning::
This only sets the properties of the current ticks.
Ticks are not guaranteed to be persistent. Various operations
can create, delete and modify the Tick instances. There is an
imminent risk that these settings can get lost if you work on
the figure further (including also panning/zooming on a
displayed figure).
Use `.set_tick_params` instead if possible.
See Also
--------
.PolarAxes.set_rgrids
.Axis.get_gridlines
.Axis.get_ticklabels
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