further f string updates

daemon/examples/myservices/sample.py

@@ -37,7 +37,7 @@ class MyService(CoreService):
     dependencies = ()
     dirs = ()
     configs = ("myservice1.sh", "myservice2.sh")
-    startup = ("sh %s" % configs[0], "sh %s" % configs[1])
+    startup = tuple(f"sh {x}" for x in configs)
     validate = ()
     validation_mode = ServiceMode.NON_BLOCKING
     validation_timer = 5
@@ -81,7 +81,7 @@ class MyService(CoreService):
         if filename == cls.configs[0]:
             cfg += "# auto-generated by MyService (sample.py)\n"
             for ifc in node.netifs():
-                cfg += 'echo "Node %s has interface %s"\n' % (node.name, ifc.name)
+                cfg += f'echo "Node {node.name} has interface {ifc.name}"\n'
         elif filename == cls.configs[1]:
             cfg += "echo hello"