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"""Exceptions used by the library.""" class PygraphError(Exception): """Root exception class for all library exceptions. Only used for subclassing.""" pass class NonexistentNodeError(PygraphError): """Thrown when a node does not exist within a graph.""" def __init__(self, node_id): self.node_id = node_id def __str__(self): return 'Node "{}" does not exist.'.format(self.node_id) class NonexistentEdgeError(PygraphError): """Thrown when an edge does not exist within a graph.""" def __init__(self, edge_id): self.edge_id = edge_id def __str__(self): return 'Edge "{}" does not exist.'.format(self.edge_id) class DisconnectedGraphError(PygraphError): """Thrown when a graph is disconnected (and such is unexpected by an algorithm).""" pass
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