python - 如何使用 Python 函数将多个值添加到键中

Question

class my_dict(dict): 

    # __init__ function 
    def __init__(self): 
        self = dict() 

    # Function to add key:value 
    def add(self, key, value): 
        self[key] = value

    # Function to remove key:value 
    def removekey(self,key):
        del self[key]


dict_obj = my_dict() 
dict_obj.add('key1', 'value1') 
dict_obj.add('key2', 'value2') 
dict_obj.add('key1', 'value3')
print(dict_obj) 

我的输出:

{'key1': 'value3', 'key2': 'value2'}

期望的输出:

{'key1': ['value1','value3'], 'key2': ['value2']}

我编写了一个程序来尝试将值添加到键中。如何使用 add 功能插入多个值？

for d in self.dict():
    for l, m in d.items():  
        dict.setdefault(l, []).append(m)

Answer 1

对您的 add 函数进行简单更改即可解决问题 -

def add(self, key, value): 
    try: 
        self[key].append(value) 
    except KeyError:  # if key does not exist
        self[key] = [value]  # add that key into the dict

输出-

{'key1': ['value1', 'value3'], 'key2': ['value2']}