编写一个python程序，实现根据字典的值查询并返回对应的键。函数的形参有两个，一个是被查询的字典，另一个是需要查询的值构成的列表；返回值为一个新的字典，该字典中每一个元素的键为需要查询的值，该字典的值为在原字典中查询到的键。例如：已知被查询的字典为： My_dict={"西安":"029","宝鸡":"0917","渭南":"0913","咸阳":"029","铜川":"0919","汉中":"0916","安康":"0915","商洛":"0914","延安":"0911","榆林":"0912"} 查询的列表为：["029","0913","0918"] 函数的返回结果应为：{'029': ['西安', '咸阳'], '0913': ['渭南'], '0918': []}

def search_dict(dic, lst):
    result = {}
    for value in lst:
        result[value] = []
        for key in dic:
            if dic[key] == value:
                result[value].append(key)
    return result

My_dict={"西安":"029","宝鸡":"0917","渭南":"0913","咸阳":"029","铜川":"0919","汉中":"0916","安康":"0915","商洛":"0914","延安":"0911","榆林":"0912"}
lst = ["029","0913","0918"]
print(search_dict(My_dict, lst))  # 输出结果为：{'029': ['西安', '咸阳'], '0913': ['渭南'], '0918': []}

相关问题

使用python编写一个程序，实现根据字典的值查询并返回对应的键。函数的形参有两个，一个是被查询的字典，另一个是需要查询的值构成的列表；返回值为一个新的字典，该字典中每一个元素的键为需要查询的值，该字典的值为在原字典中查询到的键。例如：已知被查询的字典为： My_dict={"西安":"029","宝鸡":"0917","渭南":"0913","咸阳":"029","铜川":"0919","汉中":"0916","安康":"0915","商洛":"0914","延安":"0911","榆林":"0912"} 查询的列表为：["029","0913","0918"] 函数的返回结果应为：{'029': ['西安', '咸阳'], '0913': ['渭南'], '0918': []}

def find_key(dic, lst):
res = {}
for val in lst:
res[val] = []
for key in dic:
if dic[key] == val:
res[val].append(key)
return res

My_dict={"西安":"029","宝鸡":"0917","渭南":"0913","咸阳":"029","铜川":"0919","汉中":"0916","安康":"0915","商洛":"0914","延安":"0911","榆林":"0912"}
lst = ["029","0913","0918"]
print(find_key(My_dict, lst)) # {'029': ['西安', '咸阳'], '0913': ['渭南'], '0918': []}

利用python编写一个程序，实现根据字典的值查询并返回对应的键。函数的形参有两个，一个是被查询的字典，另一个是需要查询的值构成的列表；返回值为一个新的字典，该字典中每一个元素的键为需要查询的值，该字典的值为在原字典中查询到的键。例如：已知被查询的字典为： My_dict={"西安":"029","宝鸡":"0917","渭南":"0913","咸阳":"029","铜川":"0919","汉中":"0916","安康":"0915","商洛":"0914","延安":"0911","榆林":"0912"} 查询的列表为：["029","0913","0918"] 函数的返回结果应为：{'029': ['西安', '咸阳'], '0913': ['渭南'], '0918': []}

以下是利用 Python 编写的程序，实现根据字典的值查询并返回对应的键：

def find_keys(my_dict, query_list):
    result_dict = {}
    for query in query_list:
        result_dict[query] = [key for key, value in my_dict.items() if value == query]
    return result_dict

My_dict = {"西安":"029","宝鸡":"0917","渭南":"0913","咸阳":"029","铜川":"0919","汉中":"0916","安康":"0915","商洛":"0914","延安":"0911","榆林":"0912"}
query_list = ["029","0913","0918"]
result_dict = find_keys(My_dict, query_list)
print(result_dict)

输出结果为：

{'029': ['西安', '咸阳'], '0913': ['渭南'], '0918': []}

这个程序会遍历查询列表中的每一个值，然后在原字典中查找对应的键，并将结果存储在一个新的字典中返回。如果查询的值在原字典中不存在，则对应的键的值为空列表。