diff --git a/librviz_tutorial/src/doc/tutorialformatter.py b/librviz_tutorial/src/doc/tutorialformatter.py
index 8260942a..83b69104 100644
--- a/librviz_tutorial/src/doc/tutorialformatter.py
+++ b/librviz_tutorial/src/doc/tutorialformatter.py
@@ -77,7 +77,7 @@ def run(self):
         code_prefix = '\n.. code-block:: ' + language + '\n\n'
         code_suffix = '\n'
 
-        print "tutorial-formatter running on", absfilename
+        print(f"tutorial-formatter running on {absfilename}")
         file_ = open( absfilename, 'r' )
         text_to_process = ""
         current_block = ""
diff --git a/rviz_plugin_tutorials/src/doc/tutorialformatter.py b/rviz_plugin_tutorials/src/doc/tutorialformatter.py
index 8260942a..83b69104 100644
--- a/rviz_plugin_tutorials/src/doc/tutorialformatter.py
+++ b/rviz_plugin_tutorials/src/doc/tutorialformatter.py
@@ -77,7 +77,7 @@ def run(self):
         code_prefix = '\n.. code-block:: ' + language + '\n\n'
         code_suffix = '\n'
 
-        print "tutorial-formatter running on", absfilename
+        print(f"tutorial-formatter running on {absfilename}")
         file_ = open( absfilename, 'r' )
         text_to_process = ""
         current_block = ""
diff --git a/rviz_python_tutorial/doc-src/tutorialformatter.py b/rviz_python_tutorial/doc-src/tutorialformatter.py
index 8260942a..83b69104 100644
--- a/rviz_python_tutorial/doc-src/tutorialformatter.py
+++ b/rviz_python_tutorial/doc-src/tutorialformatter.py
@@ -77,7 +77,7 @@ def run(self):
         code_prefix = '\n.. code-block:: ' + language + '\n\n'
         code_suffix = '\n'
 
-        print "tutorial-formatter running on", absfilename
+        print(f"tutorial-formatter running on {absfilename}")
         file_ = open( absfilename, 'r' )
         text_to_process = ""
         current_block = ""