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Hi Suyash,

Without more data, and assuming that you are following the ROS wiki tutorials, here: http://wiki.ros.org/tf2/Tutorials/Writing%20a%20tf2%20broadcaster%20%28Python%29

The most probable cause for your error is that you missed the 1st line in your script, this one:

#!/usr/bin/env python

Basically, this line makes sure that your script is executed as a Python script. Try to add it at the top of your script and the error should be gone.