cars = ['鲁A32444', '鲁B12333', '京B8989M', '黑C49678', '黑C46555', '沪B25041', '黑C34567'] locations = {'沪': '上海', '京': '北京', '黑': '黑龙江', '鲁': '山东', '鄂': '湖北', '湘': '湖南'} # 构建此数据类型{'山东': 2, '北京': 1, '黑龙江': 3, '上海': 1} # 方法一 dic = {} for i in cars: if locations[i[0]] in dic: dic[locations[i[0]]] += 1 else: dic[locations[i[0]]] = 1 print(dic) # 方法二 dic = {} for i in cars: # get方法,如果有键返回该键对应的值,如果没键,可以设置返回值 dic[locations[i[0]]] = dic.get(locations[i[0]], 0) + 1 print(dic)
list3 = [ {"name": "a", "hobby": "抽烟"}, {"name": "a", "hobby": "喝酒"}, {"name": "a", "hobby": "烫头"}, {"name": "wu", "hobby": "喊麦"}, {"name": "wu", "hobby": "街舞"}, ] # 构建数据类型 list4 = [{"name": "a", "hobby_list": ["抽烟", "喝酒", "汤头"]}] # 思想:如果没键就添加键,如果有键就操作此键对应的值 # 方法一 list4 = [] for i in list3: # print(i) for j in list4: if i['name'] == j['name']: # i['name']='a' j['hobby_list'].append(i['hobby']) break else: list4.append({'name': i['name'], 'hobby_list': [i['hobby']]}) print(list4)
li = [11, 22, 33, 44, 55, 77, 88, 99, 90] # 构建数据类型{'key1': [11, 22, 33, 44, 55], 'key2': [77, 88, 99, 90]} # key1对应的小于60的值,key2对应大于60的值 result = {} for i in li: if i < 66: if 'key1' not in result: result['key1'] = [] result['key1'].append(i) else: if 'key2' not in result: result['key2'] = [] result['key2'].append(i) print(result)