adding chapter 7 source code

Chapter7/multiprocessing/process1.py

@@ -0,0 +1,31 @@
+# process1.py to create simple processes with function
+import os
+from multiprocessing import Process, current_process as cp
+from time import sleep
+
+def print_hello():
+    sleep(2)
+    print("{}-{}: Hello".format(os.getpid(), cp().name))
+
+
+def print_message(msg):
+    sleep(1)
+    print("{}-{}: {}".format(os.getpid(), cp().name, msg))
+
+processes = []
+
+# creating process
+processes.append(Process(target=print_hello, name="Process 1"))
+processes.append(Process(target=print_hello, name="Process 2"))
+processes.append(Process(target=print_message,
+                         args=["Good morning"], name="Process 3"))
+
+# start the process
+for p in processes:
+    p.start()
+
+# wait till all are done
+for p in processes:
+    p.join()
+
+print("Exiting the main process")