Use f-strings in examples where possible.

Author: jonathanslenders

Diff for: examples/progress-bar/a-lot-of-parallel-tasks.py

@@ -39,7 +39,7 @@ def stop_task(label, total, sleep_time):
         threads = []
 
         for i in range(160):
-            label = "Task %i" % i
+            label = f"Task {i}"
             total = random.randrange(50, 200)
             sleep_time = random.randrange(5, 20) / 100.0
 

Diff for: examples/prompts/asyncio-prompt.py

@@ -26,7 +26,7 @@ async def print_counter():
     try:
         i = 0
         while True:
-            print("Counter: %i" % i)
+            print(f"Counter: {i}")
             i += 1
             await asyncio.sleep(3)
     except asyncio.CancelledError:

Diff for: examples/prompts/patch-stdout.py

@@ -21,7 +21,7 @@ def thread():
         i = 0
         while running:
             i += 1
-            print("i=%i" % i)
+            print(f"i={i}")
             time.sleep(1)
 
     t = threading.Thread(target=thread)