python - 根据 for 循环中的迭代次数向列表添加不同的值

Question

我是 Python 和一般编程的新手，我在处理网站解析项目时遇到了问题。

这是我设法编写的代码:

import requests
from bs4 import BeautifulSoup
import pandas as pd
pd.set_option('display.max_rows', None)
pd.set_option('display.max_columns', None)
pd.set_option('display.width', None)
pd.set_option('display.max_colwidth', -1)
import json

#necessary lists
url_list = [
    "https://warframe.market/items/melee_riven_mod_(veiled)",
    "https://warframe.market/items/zaw_riven_mod_(veiled)"
    ]
item_list = []
items_name = []
combined_data = []
iteration = 0


#looping for every url found in url_list
for url in url_list:
    #requesting data
    r = requests.get(url)
    soup = BeautifulSoup(r.content, "html.parser")

    #splitting the last part of the url which has the name of the item that I want to insert in the dataframe
    name = url.split("/")[4]
    items_name.append(name)

    #Finding in the parsed HTML code where the JSON file starts ( it start from <script> n°2)
    results = soup.find_all('script')[2].text.strip()
    data = json.loads(results)
    combined_data.append(data) #combining all the data into one list


    #filtering only the users who sell the items and are either "ingame" or "online"
    for payload in combined_data[iteration]["payload"]["orders"]:
        if payload["order_type"] == "sell" and (payload["user"]["status"] == "online" or payload["user"]["status"] == "ingame"):
            p = payload
            item_list.append(p) 
            #adding the items names to the item list       ???? PROBLEM ?????
            item_list = [dict(item, **{'name':items_name[iteration]}) for item in item_list]
    #trying to change the list from where the data gets taken from and the items name        ????? PROBLEM ????
    iteration += 1        
    
    #creating a dataframe with all the values
    df = pd.DataFrame(item_list).sort_values(by=["platinum"])

我正在尝试做但找不到解决方案的方法是将 url 引用的项目的名称添加到 item_list。

例如

<表类="s-表"> <头> 索引 白金 数量 <日>... 项目名称(有问题的列) <正文> 1 10 1 ... melee_riven_mod_(隐藏) 2 11 1 ... melee_riven_mod_(隐藏) 3 12 2 ... zaw_riven_mod_(隐藏) 4 ... ... ... zaw_riven_mod_(隐藏)

但项目名称列对所有行具有相同的名称，如下所示:

<表类="s-表"> <头> 索引 白金 数量 <日>... 项目名称(有问题的列) <正文> 1 10 1 ... melee_riven_mod_(隐藏) 2 11 1 ... melee_riven_mod_(隐藏) 3 12 2 ... melee_riven_mod_(隐藏) 4 ... ... ... melee_riven_mod_(隐藏)

所以我想问问我在for循环中做错了什么？它迭代了 2 次，这是 url_list 中的 url 数量。但它不会更改项目的名称。 我没有看到什么？

Answer 1

改变

if payload["order_type"] == "sell" and (payload["user"]["status"] == "online" or payload["user"]["status"] == "ingame"):
     p = payload
     item_list.append(p)
     #adding the items names to the item list       ???? PROBLEM ?????
     item_list = [dict(item, **{'name':items_name[iteration]}) for item in item_list]

对此:

if payload["order_type"] == "sell" and (payload["user"]["status"] == "online" or payload["user"]["status"] == "ingame"):
    payload['name'] = items_name[iteration]
    item_list.append(payload)

请注意，您可以使用 enumerate 遍历 url_list，而不是使用单独的变量 iteration 并递增它，它同时提供item 和它在每次迭代时的索引:

for iteration, url in enumerate(url_list):
    ....