Python: dict的交集与差集

dict没有提供直接求交集和差集的方法，可以通过set进行求值：

def dict_find_same_set(dict1, dict2):
    dict1_set = set(dict1.items())
    dict2_set = set(dict2.items())
    same_set = dict1_set & dict2_set
    return same_set
    
def dict_find_diff_set(dict1, dict2):
    dict1_set = set(dict1.items())
    dict2_set = set(dict2.items())
    same_set = dict1_set & dict2_set
    return (dict1_set - same_set, dict2_set - same_set)
    
def dict_filter_out_key_in_set(ori_dict, filter_set):
    filter_dict = { }
    for item in filter_set:
        key = item[0]
        filter_dict[key] = ori_dict[key]
    return filter_dict
    
def main():
    d1 = {
        "a":1,
        "b":2,
        "c":3
    }
    
    d2 = {
        "b":2,
        "c":3,
        "d":4
    }
    
    same_set = dict_find_same_set(d1, d2)
    same_dict = dict_filter_out_key_in_set(d1, same_set)
    print(same_dict)
    
    (d1_diff_set, d2_diff_set) = dict_find_diff_set(d1, d2)
    d1_diff = dict_filter_out_key_in_set(d1, d1_diff_set)
    print(d1_diff)

if __name__ == "__main__":
   main()

运行程序输出：

{'b': 2, 'c': 3}
{'a': 1}