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I am trying to understand some python code dealing with ROS messages and I have a Subscriber Callback method where
def thecallback(self, msg):
# some code here involving a variable k
if(k in msg.__slots__):
#some other code
What does this mean?
Well, yes: ROS messages are (more precisely, are compiled into) classes, and in Python they do have a __slots__ member, if this is what you are asking.
The __slots__ member basically contains the fields from the message definition. See also the wiki.
Basically, the code you have checks if the message contains the field described by the variable k. The std_msgs/Float32Multiarray message has the slots layout and data, for example.
Asked: 2021-02-15 02:56:16 -0500
Seen: 315 times
Last updated: Feb 15 '21
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