lst = [
    {'id':'hello','name':'kim','address':'seoul'},
    {'id':'hello','name':'choi','address':'busan'},
    {'id':'hey','name':'demi','address':'seoul'}
]

# 1. id를 key로하여, 새로운 dictionary 를 만듦. key가 같은 원소의 name과 address를 한 리스트안에 넣어줌.
def merge(lst):
    answer = {}
    for i in lst:
        id = i['id']
        name = i['name']
        address = i['address']

        val = answer.get(id, {'name': [], 'address': []})
        val['name'].append(name)
        val['address'].append(address)
        answer[id] = val
    return answer

# 2. (1)에서 만든 dictionary를 list로 변환
def dict_to_list(lst):
    answer = [ {'id': key, **val} for key, value in lst.items()  ]
    return answer

merged_lst = merge(lst)
print(merged_lst)

result = dict_to_list(merged_lst)
print(result)