adding chapter 7 source code

Chapter7/multiprocessing/process2.py

@@ -0,0 +1,15 @@
+# process2.py to create processes using a pool
+import os
+from multiprocessing import Process, Pool, current_process as cp
+from time import sleep
+
+def print_message(msg):
+    sleep(1)
+    print("{}-{}: {}".format(os.getpid(), cp().name, msg))
+
+# creating process from a pool
+with Pool(3) as proc:
+    proc.map(print_message, ["Orange", "Apple", "Banana",
+                             "Grapes","Pears"])
+
+print("Exiting the main process")