Random list
import random
randomArray = []
randomArray.append(random.randint(1, 10))
randomArray.append(random.randint(11, 20))
randomArray.append(random.randint(21, 30))
index = random.randint(0, 2)
print(index)
print(randomArray[index])
randomArray[index] = random.randint(101, 200)
print(randomArray[index])