[FIXED] Bind list of dictionary by a common key?

Issue

I have the following dictionnary:

my_list =_list = [
    {"a": 1, "id": 1}, {"a": 2, "id": 1}, 
    {"a": 3, "id": 2}, {"a": 4, "id": 2}
]

How can I get this output ("id.value": [values of "a"]

{"1": [1, 2], "2": [3, 4]}

I tried this :

dic={}
li=[]
for item in my_list:
    li.append(item['a'])
dic["id"] = 1
dic["a"] = li

Solution

FIrst correct the commas in the dict.

my_dic = {}
for i in my_list:
    if i["id"] in my_dic:
        my_dic[i["id"]].append(i["a"])
    else:
        my_dic[i["id"]]=[i["a"]]

Answered By - omar magdi