从抓取到CSV文件

Question

我是python的新手，正在尝试将抓取数据转换为CSV文件，但未成功。

这是代码：

from urllib.request import urlopen, Request
from bs4 import BeautifulSoup
import os
import random
import re
from itertools import cycle

def cleanhtml(raw_html):
  cleanr = re.compile('<.*?>') #cleaning the strings from these terms
  cleantext = re.sub(cleanr, '', raw_html)
  return cleantext

def scrape(url, filename, number_id):
    """
    This function scrapes a web page looking for text inside its html structure and saves it in .txt file. 
    So it works only for static content, if you need text in a dynamic part of the web page (e.g. a banner) 
    look at the other file. Pay attention that the retrieved text must be filtered out 
    in order to keep only the part you need. 

    url: url to scrape
    filename: name of file where to store text
    number_id: itis appended to the filename, to distinguish different filenames
    """
    #here there is a list of possible user agents

    user_agent = random.choice(user_agent_list)
    req = Request(url, headers={'User-Agent': user_agent})
    page = urlopen(req).read()

    # parse the html using beautiful soup and store in variable 'soup'
    soup = BeautifulSoup(page, "html.parser")

    row = soup.find_all(class_="row")

    for element in row:
        viaggio = element.find_all(class_="nowrap")

        Partenza = viaggio[0]
        Ritorno = viaggio[1]
        Viaggiatori = viaggio[2]
        Costo = viaggio[3]

        Title = element.find(class_="taglist bold")
        Content = element.find("p")



        Destination = Title.text
        Review = Content.text
        Departure = Partenza.text
        Arrival = Ritorno.text
        Travellers = Viaggiatori.text
        Cost = Costo.text


        TuristiPerCasoList = [Destination, Review, Departure, Arrival, Travellers, Cost] 
        print(TuristiPerCasoList)

到这里，一切正常。 现在，我必须将其转换为CSV文件。 我尝试了这个：

    import csv

    with open('turistipercaso','w') as file:
    writer = csv.writer(file)
    writer.writerows(TuristiPerCasoList)

但它不会在CSV文件中返回任何内容。 有人可以帮助我了解如何将其转换为CSV文件吗？

Answer 1

在每次迭代中，您都在重新分配TuristiPerCasoList值。
您真正想要的是一个string list的list ，其中字符串是特定单元格的值，第二个列表包含一行的值，第一个列表包含所有行。

为此，您应该在主列表后追加一个代表行的列表：

# instead of
TuristiPerCasoList = [Destination, Review, Departure, Arrival, Travellers, Cost]
# use
TuristiPerCasoList.append([Destination, Review, Departure, Arrival, Travellers, Cost])