Added logic to lookup ISBNs.

main.py

@@ -19,8 +19,9 @@ def processBook(ISBN):
     if Mode == 1:
         r = requests.post(URL+'/checkin/', data={'isbn': ISBN, 'locationid': Shelf, 'userid': UserID})
         print(r.text)
-
-
+    elif Mode == 3:
+        r = requests.post(URL+'/lookup/', data={'isbn': ISBN})
+        print(r.text)
 while True:
     var = str(input())
     x = var.split('.')
@@ -39,6 +40,8 @@ while True:
     elif command == 'UPDATE':
         os.system('cd ~/libraryClient')
         os.system('git pull')
+    elif command == 'LU':
+        Mode=3
     elif command == '':
         pass
     else: