chins-MBP:~ chinvincent$ pip list Package Version -------------------------------------- -------- altgraph 0.10.2 backports-abc 0.5 bdist-mpkg ...
def zhuangshi(cls): def inner(): pass return inner class A: pass print(zhuangshi(A) is zhuangshi(A)) print(id(zhuangshi(A)) == id(zhuangshi(A))) print(id(zhuangshi(A))) print(id(zhuangshi(A))) The output from the console is as...
problem description: when I was working on the actual combat article of Liao Xuefeng, I had a question when operating the database. I first defined two co-programs, and then defined a main co-program await to execute the two co-programs sequentially...
the figure is as follows: def update_model(rdd),mixture_model: it s OK to declare mixture_model directly in update_model, but every time you foreachRDD, you need to re-declare MingleModel. Makes it impossible to update the model in real time ...
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import os from collections import Counter sumsdata = [] for fname in os.listdir(os.getcwd()): if os.path.isfile(fname) and fname.endswith( .txt ): with open(fname, r ,encoding="utf-8") as fp: data = fp.readlines() ...
where the drawing contourf (x, y, z), is obtained by using the python contourf function, where x is an array of dimensions 114, y is an array of dimensions 200, and z is an array of dimensions (114200). I want to determine the coefficients of the n-...
I have been using python3 + flask, before. I recently watched a project video of Django. There are all kinds of problems in configuring the environment when python2.7 uses django on win10. There are problems in installing mysql-python and ansible packag...
like the following code: class Test(object): __instance = None def __new__(cls, *args, **kwargs): if cls.__instance: return cls.__instance else: return object.__new__(cls) def __init__(self, value):...
The database is mysql, checked the document and found no exclude, only an except_. if my table is called table_a, and has a status field, if it is a single field, you can use! = to exclude, what should I say if it is a scope? For example, if you have ...
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I have just come into contact with the future library and intend to write a simple multi-threaded script for downloading videos. The target website has 20 + videos per url, and you can get the corresponding straight chain by visiting the video url. Some...
as shown in figure is there a way to count the number of times article [] appears in article instead of article []? That is, the number of times such a list appears in article. Thank you ~ the original code is as follows: article = [] sentence0...
question: just started to practice the python crawler, crawling the web page with Beautifulsoup, the web page contains br tags, the crawling result is None. tried whether to replace br, with the string s replace function or return None. tried replaci...
chins-MBP:~ chinvincent$ pip list Package Version -------------------------------------- -------- altgraph 0.10.2 backports-abc 0.5 bdist-mpkg ...
chins-MBP:~ chinvincent$ pip install requests Collecting requests Using cached https: files.pythonhosted.org packages 49 df 50aa1999ab9bde74656c2919d9c0c085fd2b3775fd3eca826012bef76d8c requests-2.18.4-py2.py3-none-any.whl Collecting idna<2.7,>=2....
installing scrapy with pip3 install scrapy in linux will prompt segment error (core has been dumped) , import scrapy no problem, but cannot scrapy startproject xxx, prompt not found scrapy command, whether you want to enter: command scapy from...
chins-MBP:~ chinvincent$ pip install scrapy Collecting scrapy Using cached https: files.pythonhosted.org packages db 9c cb15b2dc6003a805afd21b9b396e0e965800765b51da72fe17cf340b9be2 Scrapy-1.5.0-py2.py3-none-any.whl Collecting lxml (from scrapy) Using...
class Foo(object): def f(self): pass a=Foo() print(id(Foo.f),id(a.f)) print(a.f,id(Foo.f),id(a.f)) print(str(a.f),id(Foo.f),id(a.f)) output result: 2005918566192 2005885408456 <bound method Foo.f of <__main__.Foo object at 0x...
now after I use django restfulframework to write the back-end code and deploy it to the server through nginx+uwsgi, enter ip to display the API page. Now, after the front-end code is taken, how to deploy it and enter ip to display the home page instead o...
according to Microsoft official documentation after setting up the Ubuntu remote host and zip, Visual Studio will automatically synchronize the header files from Ubuntu to the HeaderCache directory, but the header files under Synchronize are missing s...
as shown in the title, if webpack is configured in this way var htmlWebpackPlugin = require( html-webpack-plugin ); const CleanWebpackPlugin = require( clean-webpack-plugin ); let pathsToClean = [ dist , ]; module.exports = { entry: ...
try{ var b = 7 ; setTimeout(function(){console.log(b);throw new Error( )},2000) }catch(e){ console.log(1) console.log(e.message) } console print result 7; Uncaught Error: at <anonymous>:3:48 printing out 7 means that afte...
after a successful login, dispatch sends a request in componentDidMount. At first, the request is successful, but after a while, the request automatically fails, reporting an error of 401, but it is good to log in again. ...
does the privacy mode of the browser allow me to browse the web without being monitored when I work in the company? Sometimes I want to open Taobao or read some other materials in the company, hoping that privacy will not be discovered ...