我是python的新手。我正在使用 python 設計一個報價應用程序。我使用 BeautifulSoup 從聰明的報價網站獲取當天的報價。我會將它附加到文本文件中。在這里，如果當天的報價已經添加，當我再次執行程序時，它應該跳過它。如何使它成為可能這是代碼：from bs4 import BeautifulSoupimport socketimport requestsimport subprocessimport datetimedef 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() returnquotenotify()在文件中輸出：Mar 29 Where there is a great love, there are always wishes. - Willa CatherMar 29 Where there is great love, there are always wishes. - Willa Cather
2 回答
catspeake
TA貢獻1111條經驗 獲得超0個贊
繼續評論：
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()
編輯：
由于使用該模式w+會截斷文件，我建議使用 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()
郎朗坤
TA貢獻1921條經驗 獲得超9個贊
您應該首先以讀取模式打開文件并將內容加載到變量中。
您可以在下面的示例中看到，我將內容加載到變量中，然后僅當變量不在文本文件中時才附加到文件中。
text_file = open('test-file.txt', 'r+')
read_the_file = text_file.read()
text_file.close()
text_file = open('test-file.txt', 'a+')
new_string = 'Smack Alpha learns python'
if new_string not in read_the_file:
text_file.write(new_string + '\n')
text_file.close()
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