<｜begin▁of▁sentence｜>### Instruction:
Given the famous 'Zachary' karate club graph, can you use the AbstractGraphDrawer.ensure_layout method in igraph to ensure and prepare a layout for drawing the graph?
### Response:
import igraph as ig

# Load a graph
graph = ig.Graph.Famous('Zachary')

# Initialize a layout just with the graph object
layout = graph.layout()

# Use AbstractGraphDrawer's ensure_layout to convert the layout
from igraph.drawing.graph import AbstractGraphDrawer

# Assuming we are inside a method of a class that inherits from AbstractGraphDrawer
# otherwise, this standalone example won't work directly since AbstractGraphDrawer
# is designed to be used within a context of a graph drawing
drawer = AbstractGraphDrawer()
prepared_layout = drawer.ensure_layout(layout, graph)

# Now prepared_layout is guaranteed to be a Layout instance
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