<｜begin▁of▁sentence｜>### Instruction:
Given a graph with self-loops, how do you draw a specific loop edge with varying alpha channel (transparency) using igraph's custom edge drawing class?
### Response:
from igraph.drawing import AlphaVaryingEdgeDrawer
from igraph import Graph, plot

g = Graph(edges=[(0,0), (0,1), (1,1)])

surface = ig.plot(g).cairo
edge_drawer = AlphaVaryingEdgeDrawer(surface)

# Assuming we want to draw the loop edge that starts and ends at vertex 0
edge_index = g.get_eid(0, 0)

# Draw this loop
edge_drawer.draw_loop_edge(g.vs[0], None, 2.0, edge_index)

# We would typically also draw the other edges using a loop
plot(g)
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