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python裝飾器為什么要雙層嵌套函數(shù)

今天學(xué)習(xí)了一下python的裝飾器，比較難理解的是大家舉最簡(jiǎn)單的裝飾例子時(shí)都是雙層嵌套： 但是單層函數(shù)，不也能實(shí)現(xiàn)裝飾功能嗎？python把裝飾器設(shè)置成雙層的目的是什么呢？@到底代表什么運(yùn)作機(jī)制。

From [Pythondiscussion group] 2017-04-18 09:41:45 0  6  1094

python - 使用flask-socketIO怎樣講json格式數(shù)據(jù)從服務(wù)器推送到前端？

小弟近日接觸flask框架的socketio模塊，用以下代碼測(cè)試了下效果，發(fā)現(xiàn)字符串信息能夠從服務(wù)器異步加載到客戶(hù)端并顯示在網(wǎng)頁(yè)上，但是換成json類(lèi)型的就不行，瀏覽器會(huì)報(bào)錯(cuò) Uncaught TypeError: Ca...

From [Pythondiscussion group] 2017-04-17 17:19:59 0  2  1094

Python novice is learning to read by himself and encounters something he doesn't understand

As shown in the picture, I have been learning python by myself recently. When I read books, I often see this k...

From [Pythondiscussion group] 2017-06-22 11:52:38 0  3  1093

python - How to use pandas to process minute data into hourly lines?

{code...} date2017-04-10 09:01:00 jd1709 3992.0 3992.0 3982.0 3984.02017-04-10 09:02:00 jd1709 3985.0 3988.0 3...

From [Pythondiscussion group] 2017-05-18 11:00:52 0  1  1093

python - django uses redirect to jump to the web page, how to pass the referer to the target web page

As shown in the figure below, when developing and logging in, the referer address of the http request that is ...

From [Pythondiscussion group] 2017-05-18 10:50:32 0  1  1093

網(wǎng)頁(yè)爬蟲(chóng) - python采集百度新聞的原理是什么?

火車(chē)頭有一個(gè)正文提取器,而且不少的采集軟件都有這個(gè)東西,但是就是一直不知道這些東西到底是怎么實(shí)現(xiàn)的? 或是有高人說(shuō)下實(shí)現(xiàn)的原理是多少? 比如步驟? 或是如何用python來(lái)實(shí)現(xiàn),可以舉個(gè)簡(jiǎn)單的例子

From [Pythondiscussion group] 2017-04-18 09:03:01 0  3  1093

python - 請(qǐng)看看這串密碼用的是什么加密方式？

最近在用python做模擬登陸，用chrome抓包時(shí)發(fā)現(xiàn)POST的密碼是password:1B5B95637CF6C410992DFB9C47CEE916BA86A18F91AE2D64056882F530C78D215...

From [Pythondiscussion group] 2017-04-17 17:54:16 0  1  1093

使用python numpy模塊導(dǎo)入csv文件失?。?/a>

import numpy as npdataset = np.loadtxt(r'C:UsersadaDesktopbasic-financial-info-3(new).csv',delimiter=&...

From [Pythondiscussion group] 2016-10-25 09:34:12 0  1  1093

There are paid solutions to related questions about python.

I need someone who knows python to help me solve python problems. You can add me on WeChat to discuss in detai...

From [Pythondiscussion group] 2020-09-08 16:00:52 0  0  1092

What are some successful projects with Django?

Currently, one of the most successful projects using Django is Instagram, with 5 engineers leading 100 million...

From [Pythondiscussion group] 2017-06-30 09:54:00 0  3  1092

windows-7 - On windows7, when python2.7 operates the IE browser, PAM30 reports an error: pywintypes.com_error?

If you open an IE browser before running the above code, it will run normally and no error will be reported. H...

From [Pythondiscussion group] 2017-05-27 17:39:21 0  1  1092

How to use split first in python

{code...} I set the starting index to be 's?q=', and then {code...} set the end split('&') string to be th...

From [Pythondiscussion group] 2017-05-18 10:59:49 0  1  1092

python - How to write a script to clear a certain row of test data in the database

I just need to write a script. The database has a mobile phone number for testing. After registration, there w...

From [Pythondiscussion group] 2017-05-18 10:50:07 0  1  1092

python - 為什么我直接用requests爬網(wǎng)頁(yè)可以，但用scrapy不行？

{代碼...} 能爬到我想要的結(jié)果，就是簡(jiǎn)歷的url,但是用scrapy,同樣的headers,頁(yè)面好像停留在登錄頁(yè)面？ {代碼...} 輸出的結(jié)果： {代碼...}

From [Pythondiscussion group] 2017-04-18 10:33:18 0  3  1092

mac系統(tǒng)下，Python版本切換問(wèn)題？

請(qǐng)問(wèn)各位，電腦里裝了兩個(gè)版本的python，2.7.10和3.5.1，想用pyenv在兩個(gè)版本中切換。截圖如下明明已經(jīng)切換到3.5.1了，但用的時(shí)候還是2.7.10，怎么解決？謝謝！試了用global，還是不行。。。

From [Pythondiscussion group] 2017-04-17 17:51:59 0  3  1092