用字典统计随机并能被3整除的数出现的次数

请将一组随机生成的,包含750个250-500之间随机整数的数组进行统计，统计出每个能被3整除的数出现的次数。要求∶本题应用字典进行统计。

import random
num_dict = {}
for i in range(750):
    num = random.randint(250,500)
    if num in num_dict:
        temp = num_dict[num]
        temp = temp + 1
        num_dict[num] = temp
    else:
        num_dict[num] = 1

print("数字总数", len(num_dict))

temp = 0
count = 0
for num in num_dict:
    if num % 3 == 0:
        count = count + 1
        temp = num_dict[num] + temp

print("能被3整除的数字总数", count, "，共出现了{}次。".format(temp))