我是python的新手。我正在使用python设计报价应用程序。我正在使用BeautifulSoup从聪明的报价网站上获得当天的报价。我会将其附加到文本文件中。在这里,如果已经添加了当天的报价,那么当我再次执行该程序时,应该跳过它。如何使其成为可能
代码如下:
from bs4 import BeautifulSoup
import socket
import requests
import subprocess
import datetime
def quotenotify():
timestamp = datetime.datetime.now().strftime("%b %d")
res = requests.get('https://www.brainyquote.com/quote_of_the_day')
soup = BeautifulSoup(res.text, 'lxml')
image_quote = soup.find('img', {'class': 'p-qotd bqPhotoDefault bqPhotoDefaultFw img-responsive delayedPhotoLoad'})
quoteday=image_quote['alt']
text_file = open("quotes.log", "a+")
text_file.write("%s"%timestamp+"\t"+"%s"% quoteday)
text_file.write("\n")
text_file.close()
return
quotenotify()
在文件中输出:
Mar 29 Where there is a great love, there are always wishes. - Willa Cather
Mar 29 Where there is great love, there are always wishes. - Willa Cather
答案 0 :(得分:1)
从评论继续:
from bs4 import BeautifulSoup
import requests
import datetime
def quotenotify():
timestamp = datetime.datetime.now().strftime("%b %d")
res = requests.get('https://www.brainyquote.com/quote_of_the_day')
soup = BeautifulSoup(res.text, 'lxml')
image_quote = soup.find('img', {'class': 'p-qotd bqPhotoDefault bqPhotoDefaultFw img-responsive delayedPhotoLoad'})['alt']
with open("quotes.log", "w+") as f:
if image_quote not in f.read():
f.write("%s"%timestamp+"\t"+"%s"% image_quote + "\n")
quotenotify()
编辑:
由于使用模式w+
会截断文件,因此建议使用pathlib:
from bs4 import BeautifulSoup
import requests
import datetime
from pathlib import Path
def quotenotify():
timestamp = datetime.datetime.now().strftime("%b %d")
res = requests.get('https://www.brainyquote.com/quote_of_the_day')
soup = BeautifulSoup(res.text, 'lxml')
image_quote = timestamp + "\t" + soup.find('img', {'class': 'p-qotd bqPhotoDefault bqPhotoDefaultFw img-responsive delayedPhotoLoad'})['alt']
with open("quotes3.log", "a+") as f:
contents = [Path("quotes3.log").read_text()]
print(contents)
print(image_quote)
if image_quote not in contents:
f.write("%s" % timestamp + "\t" + "%s" % image_quote + "\n")
quotenotify()
答案 1 :(得分:0)
如@DirtyBit所述,您应该首先以读取模式打开文件,然后将内容加载到变量中。
您可以在下面的示例中看到,我将内容加载到变量上,然后仅在变量不在文本文件中时才将其追加到文件中。
$doc = New-Object System.Xml.XmlDocument
$doc.LoadXml((Invoke-WebRequest -Uri $url).Content)