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class NodeConnectionFailure(Exception):
...
class ConnectionRequiresPortFailure(NodeConnectionFailure):
'A port is required'
...
class ConnectionSelfFailure(NodeConnectionFailure):
'Cannot connect a node to itself'
...
class ConnectionPointFailure(NodeConnectionFailure):
'Connection point is not on top of the node port'
...
class ConnectionPortNotEmptyFailure(NodeConnectionFailure):
'Port should be empty'
...
class ConnectionCycleFailure(NodeConnectionFailure):
'Connection would introduce a cycle in the graph'
...
class ConnectionDataTypeFailure(NodeConnectionFailure):
'Ports do not have compatible data types'
...
class PortsOfSameTypeError(NodeConnectionFailure):
...
class PortsAlreadyConnectedError(NodeConnectionFailure):
...
class MultipleInputConnectionError(NodeConnectionFailure):
...
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