python - Cartopy coastlines not showing -

i installed cartopy , trying basic example. code i'm using

import cartopy.crs ccrs import matplotlib.pyplot plt ax = plt.axes(projection=ccrs.platecarree()) ax.set_global() ax.coastlines() plt.show() 

what happens no coastlines drawn, white plot.

i have tested drawing data netcdf file i've gotten, , seems work fine error seems in coastline drawing.

the coastline files downloaded ~/.local/share/cartopy/shapefiles/natural_earth/physical first time ran example.

anyone got , idea might wrong?

have modified of matplotlib rc settings? instance, having 'patch.linewidth' set 0 prevent coastlines appearing.