Fix fstrings in examples, add alternate map attr access

examples/struct_and_perf.py

@@ -28,8 +28,8 @@ def hello(ctx: c_void_p) -> c_int32:
     dataobj.ts = ktime()
     # dataobj.comm = strobj
     print(
-        f"clone called at {dataobj.ts} by pid {
-            dataobj.pid}, comm {strobj} at time {ts}"
+        f"clone called at {dataobj.ts} by pid"
+        f"{dataobj.pid}, comm {strobj}"
     )
     events.output(dataobj)
     return c_int32(0)