Python Scraper仅将数据从最后一个URL输出到CSV

我对Python非常陌生，并试图通过做一些小项目来学习。我目前正在尝试从各种网页收集一些信息，但是，每当它将抓取的数据输出到CSV时，它似乎只输出来自上一个URL的数据

理想情况下，我希望它能够写入CSV，而不是追加，因为我只希望CSV只包含最新刮取的最新数据

我在StackOverflow上查看了一些其他类似的查询，但我要么不理解它们，要么它们不适合我。可能是前者

任何帮助都将不胜感激

import csv
import requests
from bs4 import BeautifulSoup
import pandas as pd

URL = ['URL1','URL2']

for URL in URL:
    response = requests.get(URL)
    soup = BeautifulSoup(response.content, 'html.parser')

    nameElement = soup.find('p', attrs={'class':'name'}).a
    nameText = nameElement.text.strip()

    priceElement = soup.find('span', attrs={'class':'price'})
    priceText = priceElement.text.strip()



columns = [['Name','Price'], [nameText, priceText]]


with open('index.csv', 'w', newline='') as csv_file:
    writer = csv.writer(csv_file)
    writer.writerows(columns)

---

您必须在for循环之前打开文件，并在for循环中写入每一行

或者，您必须在for循环之前创建列表，并将数据附加到此列表中

URL = ['URL1','URL2']

columns = [ ['Name','Price'] ]

for URL in URL:
    response = requests.get(URL)
    soup = BeautifulSoup(response.content, 'html.parser')

    nameElement = soup.find('p', attrs={'class':'name'}).a
    nameText = nameElement.text.strip()

    priceElement = soup.find('span', attrs={'class':'price'})
    priceText = priceElement.text.strip()

    columns.append( [nameText, priceText] )

with open('index.csv', 'w', newline='') as csv_file:
    writer = csv.writer(csv_file)
    writer.writerows(columns)

---

在for循环之前打开文件，并在for循环内部写入行。或者在for循环为所有结果创建列表之前，在for循环中附加到此列表，并使用此结果写入文件。非常感谢你的帮助！

URL = ['URL1','URL2']

columns = [ ['Name','Price'] ]

for URL in URL:
    response = requests.get(URL)
    soup = BeautifulSoup(response.content, 'html.parser')

    nameElement = soup.find('p', attrs={'class':'name'}).a
    nameText = nameElement.text.strip()

    priceElement = soup.find('span', attrs={'class':'price'})
    priceText = priceElement.text.strip()

    columns.append( [nameText, priceText] )

with open('index.csv', 'w', newline='') as csv_file:
    writer = csv.writer(csv_file)
    writer.writerows(columns)