Use walrus operator to improve readability

Author: tmadlener

README.md

@@ -34,7 +34,7 @@ version and build that automatically. This behavior is controlled via the
 `USE_EXTERNAL_CATCH2` cmake variable. It defaults to `AUTO` but can also be set
 to `ON` or `OFF` to fully control the desired behavior.
 
-### Python > 3.6
+### Python >= 3.8
 
 Check your Python version by doing:
 

python/podio_gen/cpp_generator.py

@@ -99,8 +99,8 @@ def post_process(self, datamodel):
             self._prepare_iorules()
             self._create_selection_xml()
 
-        if datamodel["links"]:
-            self._write_links_registration_file(datamodel["links"])
+        if the_links := datamodel["links"]:
+            self._write_links_registration_file(the_links)
         self._write_all_collections_header()
         self._write_cmake_lists_file()