从字典中删除所有出现多次的值

def remove_duplicate_values(dictionary):
    # 统计每个值的出现次数
    value_count = {}
    for value in dictionary.values():
        value_count[value] = value_count.get(value, 0) + 1
    
    # 删除多次出现的值
    for key, value in list(dictionary.items()):
        if value_count[value] > 1:
            del dictionary[key]
    
    return dictionary

# 示例用法
my_dict = {'a': 1, 'b': 2, 'c': 2, 'd': 3, 'e': 4, 'f': 4}
new_dict = remove_duplicate_values(my_dict)
print(new_dict)

{'a': 1, 'd': 3}