Python bokeh show only every second categorical ticker

问题

How can I set for a CategoricalAxis not to show every ticker but just every second or third one? Let say I have 20 categorics on x-axis. I tried this but it does not work:

ticker = CategoricalTicker(desired_num_ticks=10)
xaxis = CategoricalAxis(ticker=ticker)
my_fig.add_layout(xaxis, 'above')

It shows all my tickers :(

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EDIT: It would be great to show only every second label as well...

Thank you!

来源：https://stackoverflow.com/questions/34949298/python-bokeh-show-only-every-second-categorical-ticker