tf_listener.cpp /tf_listener.py

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Does Writing a tf2 listener (Python) not contain enough information / example code?

Edit:

yes of course and it runs without any problems but I want to adapt cpp code " broadcasting a transform" in tuto "setting up your robot with tf " from Cpp to python

Why didn't you mention this in your question? You specifically refer to "tf_listener C++ code". A listener is not a broadcaster.

Here is a Python version of the Writing a tf2 broadcaster tutorial: Writing a tf2 broadcaster (Python).