Raised when a requested entity (e.g., a file or directory) was not found.
For example, running the
operation could raise
NotFoundError if it receives the name of a file that
does not exist.
__init__( node_def, op, message )
The integer error code that describes the error.
The error message that describes the error.
NodeDef proto representing the op that failed.
The operation that failed, if known.
N.B. If the failed op was synthesized at runtime, e.g. a
Recv op, there will be no corresponding
object. In that case, this will return
None, and you should
instead use the
discover information about the op.
Operation that failed, or None.