我目前正在从Web API中提取数据,我试图根据以下条件过滤一些值:计算用户在两个给定日期之间出现的次数,但仅限于他/她已经购买的物品树莓派,香蕉PI和覆盆子PI2,而不是项目树莓PI3在Python中限制计数器集合
,我收到具有以下结构的JSON对象:
[{
user_id : 0001
CreatedOn: "2017-02-16 15:54:48",
item: "raspbery pi",
VIP: "YES",
Vendor_CODE: "XYZ12345",
},
{
user_id : 0001
CreatedOn: "2017-02-15 13:49:16",
item: "raspbery pi2",
VIP: "YES",
Vendor_CODE: "XYZ67890",
},
{
user_id : 0001
CreatedOn: "2017-02-10 15:54:48",
item: "raspbery pi",
VIP: "YES",
Vendor_CODE: "RST171820",
},
{
user_id : 0001
CreatedOn: "2017-01-01 21:51:13",
item: "raspbery pi3",
VIP: "YES",
Vendor_CODE: "XOL002321",
},
{
user_id : 0005
CreatedOn: "2017-01-30 17:34:18",
item: "raspbery pi",
VIP: "YES",
Vendor_CODE: "RST171820",
},
{
user_id : 0005
CreatedOn: "2017-05-30 09:04:08",
item: "banana pi",
VIP: "YES",
Vendor_CODE: "ITI342027",
}]
目前,我有以下的代码,计数用户出现两次日期的次数。
from django.shortcuts import render
from django.http import JsonResponse
from rest_framework.views import APIView
from rest_framework.response import Response
from collections import Counter
from datetime import datetime, timedelta
import json, urllib.request, dateutil.parser, urllib.parse,
#Request a response to the Web API
def get_data(request, *args, **kwargs):
# YYYY-MM-DD
start_date = datetime.now() - timedelta(days=7)
end_date = datetime.now() - timedelta(days=1)
with urllib.request.urlopen("http://10.61.202.98:8081/T/ansdb/api/rows/dev/ect",timeout=15) as url:
response_data = json.loads(url.read().decode())
#count the number of times the user appears when he bought the 4 items in two given dates
count_user_01 = Counter([k['user_id'] for k in response_data if
start_date_week < dateutil.parser.parse(k.get('CreatedOn')) < end_date_week])
我的方法是添加一些额外的“条件”来算,除了项目树莓PI3所有物品,像:
count_user_01 = Counter([k['user_id'] for k in response_data if
start_date_week < dateutil.parser.parse(k.get('CreatedOn')) < end_date_week] and k['item']!='raspberry pi3')
但如果我这样做,那么我会遇到的错误布尔对象是不可迭代的,我想我收到此错误,因为收集计数器不允许我这样做。
我的问题是:
我怎样才能实现这个额外的条件到列表中,所以我可以算,除了覆盆子PI3所有的项目,是由一个用户买的?
目前,我正在计算为特定用户购买的物品,但是如何计算所有用户购买的所有物品?
欢迎提出所有意见,解答和建议。
更新
问题1解决方案是修复在括号中的问题。
count_user_01 = Counter([k['user_id'] for k in response_data if
start_date_week < dateutil.parser.parse(k.get('CreatedOn')) < end_date_week and k['item']!='raspberry pi3'])
检查括号。 – user2357112
you mean count_user_01 = Counter([k ['user_id'] for k in response_data if start_date_week