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TypeError for built-in operation

asked 2011-06-24 04:50:04 -0500

David Lu gravatar image

updated 2014-01-28 17:09:55 -0500

ngrennan gravatar image

In working with tf.Transformer, I've run into this error many times.

TypeError: bad argument type for built-in operation

The most frustrating part of getting this message is that the traceback blames seemingly random lines of code for the error. Here's one reduced way to get the error.


import roslib; roslib.load_manifest('tf')
import tf, rospy
from geometry_msgs.msg import TransformStamped

if __name__ == '__main__':
    tfman = tf.Transformer(True, rospy.Duration(10.0))
    angle = tf.transformations.quaternion_from_euler(0,0,0)

    m = TransformStamped()
    m.header.frame_id = 'root'
    m.child_frame_id = 'child'
    print type(angle), type(m.transform.rotation)
    m.transform.rotation = angle

    for i in range(1):
        print i

This outputs:

<type 'numpy.ndarray'=""> <class 'geometry_msgs.msg._quaternion.quaternion'="">
Traceback (most recent call last):
  File "src/", line 18, in <module>
    for i in range(1):
TypeError: bad argument type for built-in operation

The clearest way to fix this is to set the rotation using a quaternion, not a numpy array. However, is there some way to get a clearer error message?

Edit: I guess the clearer question is: Why would this mistake cause a TypeError on line 18? Also, I put the error here so that the next person who searches for the error message on the board will find it here.

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The error is actually coming from CPython from another thread (so it has nothing to do with the command on line 18).

Dany gravatar image Dany  ( 2016-05-10 03:53:15 -0500 )edit

This type of print-outs happen in cases when python cannot raise an exception (e.g. if an exception was thrown in __del__). TypeError probably means a non-existing method was called, which makes sense, since you changed the type of m.transform.rotation.

Dany gravatar image Dany  ( 2016-05-10 03:54:53 -0500 )edit

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answered 2011-06-27 18:19:54 -0500

tfoote gravatar image

This would be better as a enhancment ticket than a question.

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Has this issue been fixed (link to Trac doesn't work any more)? I had this weird error popping up when trying to use the result of lookupTransform in a message. Took me a while to figure out, what the problem was (sth with the returned tuple).

bit-pirate gravatar image bit-pirate  ( 2013-10-21 21:38:20 -0500 )edit

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Asked: 2011-06-24 04:50:04 -0500

Seen: 950 times

Last updated: Jun 28 '11