Python package anomoly

asked 2012-02-24 06:02:22 -0600

cassander
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updated 2014-01-28 17:11:28 -0600

ngrennan
1 ●1 ●1

from std_msgs.msg import String

when ROS encounters a statement like the one above, where does it search, to obtain String class? I check $PYTHONPATH and it doesn't seem like the class exists in a file located in that path. I searched the ROS package std_msgs..but it only shows a folder msg that has the String.msg file in it. I don't see any module called 'msg' in which I expect to find the 'String' class..

Could someone please tell me whats going on? Am I missing something fundamental or are things really twisted a little bit.. ?

Thanks

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answered 2012-02-24 06:57:15 -0600

DimitriProsser

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updated 2012-02-24 06:58:03 -0600

Look in the std_msgs package in the src directory. When messages are generated, the resulting python module is placed in the src folder in a subdirectory with the same name as the package. So the full file path on my machine is:

/opt/ros/electric/stacks/ros_comm/messages/std_msgs/src/std_msgs

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answered 2012-02-24 07:26:06 -0600

Dan Lazewatsky
9115 ●79 ●103 ●160 http://dan.lazewatsky.com/

To add to what DimitriProsser said, when you do roslib.load_manifest('my_package'), it alters your sys.path and add the appropriate paths so python is able to do the imports.

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Python package anomoly

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