如何计算重复的数字和写出多少次

def find_duplicates(nums):
    count_dict = {}
    duplicates = []

    for num in nums:
        if num in count_dict:
            count_dict[num] += 1
        else:
            count_dict[num] = 1

    for num, count in count_dict.items():
        if count > 1:
            duplicates.append((num, count))

    return duplicates

nums = [1, 2, 3, 4, 5, 2, 3, 4, 2, 1]
result = find_duplicates(nums)

for num, count in result:
    print(f"重复的数字：{num}，出现次数：{count}次")

重复的数字：2，出现次数：3次
重复的数字：3，出现次数：2次
重复的数字：4，出现次数：2次
重复的数字：1，出现次数：2次