Python中字典问题请求解惑

import random

numbers = [random.randint(0, 10) for i in range(100)]

numberkeys = {}
for i in numbers:
    if numberkeys.get(i):
        numberkeys[i] += 1
    else:
        numberkeys[i] = 1
numberkeys = dict(sorted(numberkeys.items(), key=lambda x: x[1], reverse=True))
print(numberkeys)