Update app.py

app.py

@@ -4,6 +4,12 @@ import random as rd
 def add2List(num,startRand,endRand):
     aList = []
     bList = []
+    if num =="":
+        num=10
+    if startRand=="":
+        startRand=1
+    if endRand=="":
+        endRand=100
     num = int(num)
     startRand = int(startRand)
     endRand = int(endRand)