<｜begin▁of▁sentence｜>### Instruction:
As a community organizer facilitating a neighborhood improvement project, you're tasked with visualizing community networks to enhance collaboration among residents. You have gathered a list of locations where key community members reside, representing vertices in your network graph. Now, you're exploring how to utilize the CircleDrawer feature within the Neighborhood Connect platform, which integrates with Cairo for graphical rendering. Your goal is to visually represent these vertices as circular markers on the network graph to better understand the spatial distribution of community influencers.
### Response:
import igraph as ig
from igraph.drawing import CircleDrawer

# Assume g is your igraph Graph with initialized positions for vertices
# positions = [(x, y), (x1, y1), ...] for each vertex in g

# Initialize Cairo drawing surface
surface = ig.drawing.surface.Surface(400, 300)
ctx = surface.cairo_create()

circle_drawer = CircleDrawer()
for pos in positions:
    # Draw a circle for each vertex position
circle_drawer.draw_path(ctx, pos[0], pos[1], 10)  # x, y, radius
    ctx.stroke()  # Stroke the path
g.write_svg('graph_with_circles.svg', surface)
<|EOT|>
