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python - 現(xiàn)在用scrapy爬一個網(wǎng)站始終遇到521錯誤，是怎么回事呢？

www.cnvd.org.cn是個很奇怪的網(wǎng)站，如過你用瀏覽器訪問時正常的，但是如果用http請求就會出現(xiàn)各種錯。比如：wget http://www.cnvd.org.cn 返回：--2016-08-26 20:37:...

From [Pythondiscussion group] 2017-04-18 09:36:32 0  2  1811

Flask Web開發(fā) 發(fā)送電子郵件 error: [Errno 10060]

1.學(xué)習(xí)Flask Web開發(fā)這本書，在8.6.2發(fā)送確認(rèn)郵件的時候沒收到電子郵件，郵箱我改成qq郵箱了，但是報錯了，感覺像是和線程有關(guān)。（1）email.py的代碼from threading im...

From [Pythondiscussion group] 2016-11-02 13:11:00 0  1  1806

Where is the homework after class?

Where is the homework after class?

From [Pythondiscussion group] 2020-02-21 16:45:36 0  0  1801

Python：urllib2.URLError: <urlopen error [Errno 11004] getaddrinfo failed>

使用Python讀取某個網(wǎng)頁的數(shù)據(jù)，如果網(wǎng)頁打不開，就會報錯 代碼如下 {代碼...} 報錯如下 {代碼...} 剛剛試了下，這樣沒法捕獲錯誤： {代碼...}

From [Pythondiscussion group] 2017-04-17 11:54:34 0  1  1801

Grammar - In Python, can the break and continue statements only be used with if?

In Python, can the break and continue statements only be used with if? The picture below is from Liao Xuefeng’...

From [Pythondiscussion group] 2017-05-18 10:58:06 0  2  1796

requests - python request HTTPS報錯54, 'Connection reset by peer

最新更新：1、目標(biāo)是本地電腦（開發(fā)環(huán)境）request一個API，取得返回的JSON。2、本地使用request請求API的https地址時，報了這個錯。3、本地使用request請求別的網(wǎng)址：zhihu.comgith...

From [Pythondiscussion group] 2017-04-17 17:53:26 0  2  1794

python - 寫一個函數(shù)，計算如下幾個字母代表的數(shù)字： AB-CD=EF EF+GH=PPP

以前找的感覺有缺陷 有0的話就不行了 el = 'AB-CD=EF EF+GH=PPP'ns = '0123456789'el = el.replace('=','==').replace(' ', ' and ')vs...

From [Pythondiscussion group] 2017-04-17 17:43:04 0  1  1792

python - how to use variables in xpath

How to use variables in xpath? I want to select elements whose id is a certain value. This value is a variable...

From [Pythondiscussion group] 2017-06-28 09:26:23 0  4  1791

python - Use scrapy to write a crawler. After sending a request, the server all returns 202 directly. What should I do?

What I crawled was the China Judgment Documents Network, and it was working fine before. I sent a request, and...

From [Pythondiscussion group] 2017-06-28 09:25:09 0  2  1782

python - Find Markov chain state transition probability matrix

A time series is as follows: {code...} This time series has a total of 4032 values, and the value space of the...

From [Pythondiscussion group] 2017-05-18 10:57:34 0  1  1781

python - 如何防止狂點提交表單按鈕導(dǎo)致的數(shù)據(jù)重復(fù)？

最近寫了一個論壇，但是測試中發(fā)現(xiàn)，在發(fā)布帖子時，如果網(wǎng)速比較慢，只要瘋狂點擊表單提交按鈕就會在數(shù)據(jù)庫里產(chǎn)生很多重復(fù)的帖子。 在網(wǎng)上查了很多資料，給出的方案大都是 js 禁用提交按鈕，請問如果不用 js 的話...

From [Pythondiscussion group] 2017-04-18 10:05:45 0  12  1780

python - numpy 的 loadtxt 函數(shù)讀取漢字問題

From [Pythondiscussion group] 2017-04-18 10:07:12 0  1  1765

python - scrapy 遍歷url列表 ，循環(huán)發(fā)送請求 只循環(huán)一次的問題

一 問題描述 我把url構(gòu)成列表作為爬蟲請求的入口（由'http://www.bjev520.com/jsp/beiqi/pcmap/do/pcMap.jsp?cityName=省市名'構(gòu)成）。對入口地址請求后，每個對象...

From [Pythondiscussion group] 2017-04-18 10:29:37 0  0  1759

python - Can I execute the source statement using pyhive?

cursor.execute("source '/home/hadoop/create_table.sql'") execution result {code...} The above error ...

From [Pythondiscussion group] 2017-06-28 09:22:35 0  1  1751

Syntax - Python's integers and floating point numbers have no size limit?

I have learned C before, and now I am learning Python 3.5. The picture below is from Liao Xuefeng’s website. W...

From [Pythondiscussion group] 2017-05-18 10:57:58 0  2  1745