生成字典小技巧

# 将list3 这种数据类型转化成list4类型
list3 = [
{"name": "a", "hobby": "抽烟"},
{"name": "a", "hobby": "喝酒"},
{"name": "a", "hobby": "烫头"},
{"name": "a", "hobby": "Massage"},
{"name": "b", "hobby": "喊麦"},
{"name": "b", "hobby": "街舞"},
{"name": "b", "hobby": "出差"},
]
list4 = [
    {"name": "a", "hobby_list": ["抽烟", "喝酒", "烫头", "Massage"]},
    {"name": "b", "hobby_list": ["喊麦", "街舞","出差"]},
]
1.

# dic={}
# for i in list3:
#     if i["name"] in dic:
#         dic[i["name"]]["hobby_list"].append(i["hobby"])
#     else:
#         dic[i['name']] = {'name': i['name'], 'hobby_list': [i['hobby'], ]}
# print(list(dic.values()))
1.1
# dic = {}
# for i in list3:
#     if i['name'] not in dic:
#         dic[i['name']] = {'name': i['name'],'hobby_list':[i['hobby'],]}
#     else:
#         dic[i['name']]['hobby_list'].append(i['hobby'])
# print(list(dic.values()))
2.
# l1=[]
# for i in list3:
#     for j in l1:
#         if i['name'] == j['name']:
#             j['hobby_list'].append(i['hobby'])
#             break
#     else:
#         l1.append({'name': i['name'], 'hobby_list':[i['hobby'],]})
# print(l1)

3.
# li=[]
# lis=[]
# dic={"name":"","hobby_list":[]}
# for i in range(len(list3)):
#     li.append(list3[i]["name"])
# li=list(set(li))
# print(li)
# for i in li:
#     dic={}
#     dic["name"]=i
#     dic["hobby_list"]=[]
#     for k in range(len(list3)):
#         if i==list3[k]["name"]:
#             dic["hobby_list"].append(list3[k]["hobby"])
#     lis.append(dic)
# print(lis)