adding chapter 7 source code

Chapter7/multithreading/thread1.py

@@ -0,0 +1,30 @@
+# thread1.py to create simple threads with function
+
+from threading import current_thread, Thread as Thread
+from time import sleep
+
+
+def print_hello():
+    sleep(2)
+    print("{}: Hello".format(current_thread().name))
+
+
+def print_message(msg):
+    sleep(1)
+    print("{}: {}".format(current_thread().name, msg))
+
+
+# creating threads
+t1 = Thread(target=print_hello, name="Th 1")
+t2 = Thread(target=print_hello, name="Th 2")
+t3 = Thread(target=print_message, args=["Good morning"], name="Th 3")
+
+# start the threads
+t1.start()
+t2.start()
+t3.start()
+
+# wait till all are done
+t1.join()
+t2.join()
+t3.join()