Try / catch for parsing str to int

main.py

@@ -8,7 +8,11 @@ import sys
 if __name__ == '__main__':
     row = 0
     if len(sys.argv) > 1:
-        row = sys.argv[1]
+        try:
+            row = int(sys.argv[1])
+        except ValueError:
+            sys.exit(1)
+
     start = time.time()
 
     db = database.db