在使用python的文件中的打印文本中的一点点误差

Question

我正在使用python在csv文件中写入一些文本.. 下面是以哪种方式获取文件中的写入数据的屏幕截图。

您可以看到，在Channel Social Media Links列中，所有链接都在其他下一行单元格中写入良好，但第一个链接未在Channel Social Media Links列中写入。请我怎么能这样写？

我的Python脚本是在这里

from urllib.request import urlopen as uReq 
from bs4 import BeautifulSoup as soup 

myUrl='https://www.youtube.com/user/HolaSoyGerman/about' 


uClient = uReq(myUrl) 
page_html = uClient.read() 
uClient.close() 

page_soup = soup(page_html, "html.parser") 

containers = page_soup.findAll("h1",{"class":"branded-page-header-title"}) 

filename="Products2.csv" 
f = open(filename,"w") 

headers = "Channel Name,Channel Description,Channel Social Media Links\n" 

f.write(headers) 

channel_name = containers[0].a.text 
print("Channel Name :" + channel_name) 

# For About Section Info 
aboutUrl='https://www.youtube.com/user/HolaSoyGerman/about' 


uClient1 = uReq(aboutUrl) 
page_html1 = uClient1.read() 
uClient1.close() 

page_soup1 = soup(page_html1, "html.parser") 

description_div = page_soup.findAll("div",{"class":"about-description 
branded-page-box-padding"}) 
channel_description = description_div[0].pre.text 
print("Channel Description :" + channel_description) 
f.write(channel_name+ "," +channel_description) 
links = page_soup.findAll("li",{"class":"channel-links-item"}) 
for link in links: 
social_media = link.a.get("href") 
f.write(","+","+social_media+"\n") 
f.close() 

Answer 1

，如果你写你的文件时利用Python的CSV库这将有助于。这可以将项目列表转换为正确的逗号分隔值。

from urllib.request import urlopen as uReq 
from bs4 import BeautifulSoup as soup 
import csv 

myUrl = 'https://www.youtube.com/user/HolaSoyGerman/about' 

uClient = uReq(myUrl) 
page_html = uClient.read() 
uClient.close() 

page_soup = soup(page_html, "html.parser") 
containers = page_soup.findAll("h1",{"class":"branded-page-header-title"}) 
filename = "Products2.csv" 

with open(filename, "w", newline='') as f: 
    csv_output = csv.writer(f) 
    headers = ["Channel Name", "Channel Description", "Channel Social Media Links"] 
    csv_output.writerow(headers) 

    channel_name = containers[0].a.text 
    print("Channel Name :" + channel_name) 

    # For About Section Info 
    aboutUrl = 'https://www.youtube.com/user/HolaSoyGerman/about' 

    uClient1 = uReq(aboutUrl) 
    page_html1 = uClient1.read() 
    uClient1.close() 

    page_soup1 = soup(page_html1, "html.parser") 

    description_div = page_soup.findAll("div",{"class":"about-description branded-page-box-padding"}) 
    channel_description = description_div[0].pre.text 
    print("Channel Description :" + channel_description) 

    links = [link.a.get('href') for link in page_soup.findAll("li",{"class":"channel-links-item"})] 
    csv_output.writerow([channel_name, channel_description, links[0]]) 

    for link in links[1:]: 
     csv_output.writerow(['', '', link]) 

这会给你一个单行每个在最后一列的HREFs，例如：

Channel Name,Channel Description,Channel Social Media Links 
HolaSoyGerman.,Los Hombres De Verdad Usan Pantuflas De Perrito,http://www.twitter.com/germangarmendia 
,,http://instagram.com/germanchelo 
,,http://www.youtube.com/juegagerman 
,,http://www.youtube.com/juegagerman 
,,http://www.twitter.com/germangarmendia 
,,http://instagram.com/germanchelo 
,,https://plus.google.com/108460714456031131326 

每个writerow()通话将写值的列表，以该文件为逗号分隔值并在最后自动为你添加换行符。所需要的就是构建每行的值列表。首先将您的链接的第一个，并在您的频道描述后，使其成为列表中的最后一个值。其次，为前两列有空值的剩余链接写一行。

---

为了回答您的评论，下面应该让你开始：

from urllib.request import urlopen as uReq 
from bs4 import BeautifulSoup as soup 
import csv 

def get_data(url, csv_output): 

    if not url.endswith('/about'): 
     url += '/about' 

    print("URL: {}".format(url)) 
    uClient = uReq(url) 
    page_html = uClient.read() 
    uClient.close() 

    page_soup = soup(page_html, "html.parser") 
    containers = page_soup.findAll("h1", {"class":"branded-page-header-title"}) 

    channel_name = containers[0].a.text 
    print("Channel Name :" + channel_name) 

    description_div = page_soup.findAll("div", {"class":"about-description branded-page-box-padding"}) 
    channel_description = description_div[0].pre.text 
    print("Channel Description :" + channel_description) 

    links = [link.a.get('href') for link in page_soup.findAll("li", {"class":"channel-links-item"})] 
    csv_output.writerow([channel_name, channel_description, links[0]]) 

    for link in links[1:]: 
     csv_output.writerow(['', '', link]) 

    #TODO - get list of links for the related channels 

    return related_links 


my_url = 'https://www.youtube.com/user/HolaSoyGerman' 
filename = "Products2.csv" 

with open(filename, "w", newline='') as f: 
    csv_output = csv.writer(f) 
    headers = ["Channel Name", "Channel Description", "Channel Social Media Links"] 
    csv_output.writerow(headers) 

    for _ in range(5): 
     next_links = get_data(my_url, csv_output) 
     my_url = next_links[0]  # e.g. follow the first of the related links