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Circular dependency can arise when two modules rely on each other's definitions, causing import issues. In this case, we have two Python files: node.py and path.py. Initially, path.py imported Node from node.py. However, after a new method was added to Node referencing Path, circular dependency occurred.
To resolve this issue, we can consider several approaches:
1. Conditional Import:
Import path.py only in the function where it's needed.
# in node.py from path import Path class Node: # ... # in path.py def method_needs_node(): from node import Node n = Node() # ...
2. Late Binding:
Use setattr() to assign the missing class reference at runtime.
# in node.py # Placeholder Path class class Path: pass # Importing path.py import path # Assigning the actual Path class after importing path.py path.Path = load_node_module('path.Path') # Implementation details omitted class Node: # ... # in path.py class Path: # ...
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