tf2_ros Python API

Exceptions

exception tf2.TransformException

base class for tf exceptions. Because tf2.TransformException is the base class for other exceptions, you can catch all tf exceptions by writing:

try:
    # do some tf2 work
except tf2.TransformException:
    print "some tf2 exception happened"

exception tf2.ConnectivityException: subclass of TransformException. Raised when that the fixed_frame tree is not connected between the frames requested.

exception tf2.LookupException: subclass of TransformException. Raised when a tf method has attempted to access a frame, but the frame is not in the graph. The most common reason for this is that the frame is not being published, or a parent frame was not set correctly causing the tree to be broken.

exception tf2.ExtrapolationException: subclass of TransformException Raised when a tf method would have required extrapolation beyond current limits.

exception tf2.InvalidArgumentException: subclass of TransformException. Raised when the arguments to the method are called improperly formed. An example of why this might be raised is if an argument is nan.

BufferInterface

Buffer

BufferClient

TransformBroadcaster

TransformListener