Merge pull request #2 from akincan-kilic/patch-1

Daemon Thread question -akin

Author: canbula

Week08/midterm/from_akin.md

@@ -0,0 +1,156 @@
+```python 
+    
+import threading
+from time import sleep
+import logging
+
+logging.basicConfig(level=logging.DEBUG, format='%(threadName)s: %(message)s')
+
+def print_range(start_num, end_num) -> None:
+    for i in range(start_num, end_num):
+        if threading.current_thread().daemon:
+            # This daemon thread should monitor if all the threads running this are finished
+            logging.info(f"Current active threads: {threading.active_count()}")
+            if threading.active_count() == 1:
+                logging.info('All threads finished.')
+                break
+            sleep(1)
+        else:
+            logging.info(i)
+            sleep(0.2)
+
+t1 = threading.Thread(target=print_range, args=(1, 10))
+t2 = threading.Thread(target=print_range, args=(-10, 0))
+t3 = threading.Thread(target=print_range, args=(0, 1000), daemon=True)
+
+
+t1.start()
+t2.start()
+t3.start()
+
+t1.join()
+t2.join()
+t3.join()
+
+if not t1.is_alive() and not t2.is_alive():
+      print('Finished')
+```
+
+# Which one of the answers below is a possible output of the Python code above?
+
+
+# a)
+```
+Thread-1 (print_range): 1
+Thread-2 (print_range): -10
+Thread-3 (print_range): Current active threads: 4
+Thread-2 (print_range): -9
+Thread-1 (print_range): 2
+Thread-2 (print_range): -8
+Thread-1 (print_range): 3
+Thread-2 (print_range): -7
+Thread-1 (print_range): 4
+Thread-2 (print_range): -6
+Thread-1 (print_range): 5
+Thread-3 (print_range): Current active threads: 4
+Thread-1 (print_range): 6
+Thread-2 (print_range): -5
+Thread-1 (print_range): 7
+Thread-2 (print_range): -4
+Thread-1 (print_range): 8
+Thread-2 (print_range): -3
+Thread-2 (print_range): -2
+Thread-1 (print_range): 9
+Thread-2 (print_range): -1
+Thread-3 (print_range): Current active threads: 3
+Thread-3 (print_range): Current active threads: 2
+...
+...995 more lines of (Thread-3 (print_range): Current active threads: 2)
+...
+Thread-3 (print_range): Current active threads: 2
+Finished
+```
+
+# b)
+```
+Thread-1 (print_range): 1
+Thread-2 (print_range): -10
+Thread-3 (print_range): Current active threads: 3
+Thread-1 (print_range): 2
+Thread-2 (print_range): -9
+Thread-1 (print_range): 3
+Thread-2 (print_range): -8
+Thread-1 (print_range): 4
+Thread-2 (print_range): -7
+Thread-1 (print_range): 5
+Thread-2 (print_range): -6
+Thread-3 (print_range): Current active threads: 3
+Thread-1 (print_range): 6
+Thread-2 (print_range): -5
+Thread-1 (print_range): 7
+Thread-2 (print_range): -4
+Thread-1 (print_range): 8
+Thread-2 (print_range): -3
+Thread-1 (print_range): 9
+Thread-2 (print_range): -2
+Thread-2 (print_range): -1
+Thread-3 (print_range): All threads finished.
+Finished
+```
+
+# c) 
+```
+Thread-2 (print_range): -10
+Thread-1 (print_range): 1
+Thread-3 (print_range): Current active threads: 3
+Thread-2 (print_range): -9
+Thread-2 (print_range): -8
+Thread-1 (print_range): 2
+Thread-1 (print_range): 3
+Thread-1 (print_range): 4
+Thread-1 (print_range): 5
+Thread-2 (print_range): -7
+Thread-2 (print_range): -6
+Thread-1 (print_range): 6
+Thread-2 (print_range): -5
+Thread-2 (print_range): -4
+Thread-2 (print_range): -3
+Thread-2 (print_range): -2
+Thread-2 (print_range): -1
+Thread-3 (print_range): Current active threads: 2
+Thread-1 (print_range): 7
+Thread-1 (print_range): 8
+Thread-1 (print_range): 9
+Thread-3 (print_range): Current active threads: 1
+Thread-3 (print_range): All threads finished.
+Finished
+```
+
+# d)
+```
+Thread-2 (print_range): -10
+Thread-1 (print_range): 1
+Thread-3 (print_range): Current active threads: 4
+Thread-2 (print_range): -9
+Thread-2 (print_range): -8
+Thread-1 (print_range): 2
+Thread-1 (print_range): 3
+Thread-1 (print_range): 4
+Thread-1 (print_range): 5
+Thread-2 (print_range): -7
+Thread-2 (print_range): -6
+Thread-1 (print_range): 6
+Thread-3 (print_range): Current active threads: 4
+Thread-2 (print_range): -5
+Thread-2 (print_range): -4
+Thread-2 (print_range): -3
+Thread-2 (print_range): -2
+Thread-2 (print_range): -1
+Thread-1 (print_range): 7
+Thread-1 (print_range): 8
+Thread-1 (print_range): 9
+Finished
+```
+
+# e)
+```None of the above```