Cartopy doesn't render left and right longitude labes

Question

I'm using cartopy to draw a geomap. This is how I set up graticule rendering:

    if graticule:
        gl = ax.gridlines(
            draw_labels=True,
            linewidth=0.8,
            color='gray',
            alpha=0.5,
            linestyle='--',
            x_inline=False,
            y_inline=True
        )

        gl.xlocator = mticker.FixedLocator(np.arange(-180, 181, 10))
        gl.ylocator = mticker.FixedLocator(np.arange(0, 91, 10))

        gl.top_labels = False
        gl.bottom_labels = True
        gl.left_labels = True
        gl.right_labels = True
        gl.xlabel_style = {'size': 10, 'color': 'gray'}
        gl.ylabel_style = {'size': 10, 'color': 'gray'}

cartopy doesn't draw longitude labels to the left and to the right of the map. Only bottom and top (if on) labels are drawn:

With ax.set_extent([0, 40, 75, 85], crs=ccrs.PlateCarree()) added:

Latitude labels are okay being inline.

Answer 1

In draw_labels parameter, instead of setting it to True you can pass a dictionary with each 4 side and which coordinates you wish to see:

gl = ax.gridlines(
    draw_labels={"bottom": "x", "left": "x", "right":"x"},
    linewidth=0.8,
    color='gray',
    alpha=0.5,
    linestyle='--',
    x_inline=False,
    y_inline=True
)

You will also need to remove these 4 lines:

# gl.top_labels = False
# gl.bottom_labels = True
# gl.left_labels = True
# gl.right_labels = True