Python determines whether a variable exists

How to determine if a variable exists in Python? {Code...} This way, you can make a judgment before making a d...

From [Pythondiscussion group] 2017-07-05 10:35:30 0  1  1208

django listview 下如何展示 model定义为choice的对应值

模型中定义：我如何在列表中循环出对应值。红框中 怎么显示弄。现在只能显示数字。多谢。

From [Pythondiscussion group] 2016-11-16 14:31:10 0  1  1208

Python how to extract all ID names and CLASS names from css files

There is a requirement to extract all ID names and CLASS names from css files into two lists. Can this functio...

From [Pythondiscussion group] 2017-07-05 10:35:41 0  1  1207

shell - How to pass parameters passed to bash to python starting from the second one

{code...} Running method {code...} is how to pass the incoming bash parameters to the python script starting f...

From [Pythondiscussion group] 2017-06-28 09:24:40 0  1  1207

python - flask reports an error ValueError: invalid key 'nicknickname'

I raise a question and record it by the way. Because there are many files involved, I only post part of the co...

From [Pythondiscussion group] 2017-06-12 09:26:35 0  1  1207

python - How to not display scientific notation when using print

As mentioned, I tried the online method but it was not ideal.

From [Pythondiscussion group] 2017-05-18 10:51:22 0  2  1207

python - Pycharm设置中 Excluded\ Sources\Resources 的意思？

Pycharm的设置项Project Structure下有Mark as:Excluded\ Sources\Resources 以及Templates几个设置，Templates我知道是模板设置，剩余三项不知道是作什...

From [Pythondiscussion group] 2017-04-17 16:01:44 0  1  1207

pycharm 界面显示成乱码

pycharm 启动以后就直接显示乱码. 估计是跟Java的设定有关.已经浪费了大量的时间. 本来是在spyder学习Python的, 但是spyder没有快捷键. e.g 代码要移到最末才能提行.不想在IDE...

From [Pythondiscussion group] 2016-11-08 13:29:24 0  1  1206

Why not use Pycharm

Why not use Pycharm

From [Pythondiscussion group] 2021-10-22 22:29:14 0  5  1204

Web crawler-Introduction to Python crawler

I am about to be a sophomore, I have studied Python by myself, and I know basic grammar. I want to learn crawl...

From [Pythondiscussion group] 2017-07-05 10:34:11 0  3  1204

logging - Python log, should the time use UTC time or local time?

The actual phenomenon is that I remember reading a blog before. It said that the time in UTC 0 time zone shoul...

From [Pythondiscussion group] 2017-06-12 09:26:57 0  2  1204

python - flask 一直显示500 Internal Server Error

在跟着《Flask Web开发：基于Python的Web应用开发实战》这本书中的例子写程序。 有两个页面，一个是主页面index，一个是user页面 打开主页会出现Internal Server Error，/user/...

From [Pythondiscussion group] 2017-04-17 14:33:33 0  1  1204

python - The simplest way to get the middle text. . The shorter the code, the better. .

//Dynamic Data Begin WEBVAR_JSONVAR_WEB_SESSION = { WEBVAR_STRUCTNAME_WEB_SESSION : [ { 'SESSION_COOKIE' : 'ot...

From [Pythondiscussion group] 2017-05-18 10:48:06 0  1  1199

xpath - python怎么用lxml处理

例如： {代码...} 就是在p标签里可能会出现同样的em标签，而且数量不定，那我怎么获取p的内容，包括em里的内容。例如第二个p获取输出是‘没aa没aa’ 或者获取到p节点之后，怎么把里面的内容转换为字符串

From [Pythondiscussion group] 2017-04-18 10:19:05 0  3  1199

python - 爬虫数据替换  

{代码...} 如图想分别获得网站来源和时间，但是用split方法无效，打印出来好像是空格，但是不能匹配替换。源代码中是   ，请问如何匹配替换，分别得到两种数据？

From [Pythondiscussion group] 2017-04-18 10:04:56 0  3  1199