First commit

text.py

@@ -0,0 +1,55 @@
+import asyncio
+import time
+
+async def say_after(delay, what):
+    print(1)
+    await asyncio.sleep(delay)
+    print(what)
+    
+async def say_after2(delay, what):
+    print(2)
+    await asyncio.sleep(delay)
+    print(what)
+
+async def say_after3(delay, what):
+    print(3)
+    await asyncio.sleep(delay)
+    print(what)
+    
+
+async def main():
+    l = []
+    
+    await say_after3(3, "delay1")
+    
+    task1 = asyncio.create_task(
+        say_after(1, 'hello'))
+
+    task2 = asyncio.create_task(
+        say_after2(2, 'world'))
+    
+    l.append(task1)
+    l.append(task2)
+    
+    task1.add_done_callback(l.remove)
+    task2.add_done_callback(l.remove)
+    
+    
+    await say_after3(3, "delay2")
+
+    print(f"started at {time.strftime('%X')}")
+
+    # Wait until both tasks are completed (should take
+    # around 2 seconds.)
+    # await task1   
+    # await task2
+    
+    while len(l) != 0:
+        print("wait...")
+        await asyncio.sleep(1)
+
+    print(f"finished at {time.strftime('%X')}")
+    
+    
+if __name__ == "__main__":
+    asyncio.run(main())