我想编写一个循环函数，遍历我的每个字母
original = ['ABCD', 'DCBA', 'AAAA', 'AABB']
letters = ['A', 'B', 'C', 'D']
p = 1
for o in original: # loop through the original list
for i in range(0,len(o)): # loop through each letter in selected list
if random.randint(1,10) == p: #if this gives me the probability that is met
# I want to change the current letter on the current index to
# something else different from the letter list by random (maybe random.choice)
我是python的新手，请您指教。 我不想使用类或任何其他库，但请随意
