bokeh map plot. lat/long to x and y

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I am trying to plot some circle markers in bokeh, python on stamer toner map. I have locations from google map api in such format:

 latitude 41.552164 longitude 44.990961

But the bokeh map plot gets data points in X and Y coordinate format. How can I transform these lat/long coordinates to X and Y?

Thank you in advance.

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