do questions on a platform similar to leetcode, youdao connectivity search. The function is placed in the class instead of using def _ _ init__ at the beginning of the class, an empty dictionary is declared directly but when you run the problem-...
encountered a problem and simplified it. has a dataframe df = pd.DataFrame([[ a , 1, c ], [ a , 3, a ], [ a , 2, b ], [ c , 3, a ], [ c , 2, b ], [ c , 1, c ], [ b , 2, b ], [ ...
problem description the system wants to limit the number of posts posted by newly registered users or prevent malicious comments the environmental background of the problems and what methods you have tried generally speaking, browsing comments are...
when using itchat, the message is not updated in time, and you need to zoom the command line window to punish the update. What s going on? ...
pytorch has been successfully installed according to conda install pytorch torchvision cudatoolkit=10.0-c pytorch cuda and cudnn on the official website. Through the nvcc instruction, you can see that it is Cuda compilation tools, release 10.0, V1...
python executes regularly, starting at 00:03:30 every day and every three and a half minutes (210s). How can it be achieved? I will not use when I use apscheduler...
is working on a py file for cloud word images. an error occurred while importing matplotlib. error message == RESTART: C: Users Administrator Anaconda3 Lib site-packages WordCloud.py == Traceback (most recent call last): File "C: Users ...
recently, we are looking for a free monitoring mode tool for Apple to use with MDM development. The only way for Apple to enable supervisory mode is to connect the iOS device to the Mac and use Apple Configurator 2 (this operation will reset the device)....
I want to implement the function of , which returns all questions under all tags that the user follows and sorts them in chronological order. Tag and Question are many-to-many, User and Question are one-to-many, and user and tag are many-to-many I ...
string original format: 123123 requirements: 1O2O3O1T2T3T1O2O3O description: add O after characters that are not in parentheses, and T after characters in parentheses...
import sympy a,b,m,n,x=sympy.symbols("a,b,m,n,x") f1=sympy.cos(m*x) f2=sympy.sin(n*x) v2=sympy.integrate(f1*f2,(x,a,b)) print(v2.subs({a:0,b:2*sympy.pi,m:100,n:100})) the result is 0 , but I can only take mforce n as a specific integer for che...
I have accumulated a lot of PPT templates in recent years. I want to make thumbnails like those PPT template websites . I have searched the Internet for a long time and tried many keywords: . PPT generates thumbnails in batches PPT to Picture bat...
Failed to establish a new connection: [Errno -3] Temporary failure in name resplution is this error a situation? I think it is explained on the Internet that it is a DNS parsing error. My raspberry pie I set the static IP is 127.0.0.222Pax 24 what shoul...
recently, I was studying a Django REST framework tutorial. I made an error when writing a script to import data into the database. Please take a look at it. Thank you. Development Environment: win10+python3.6+django2.0 Project directory structure is a...
Flask sends QQ email too slowly (even asynchronously). The original 150ms response page has been changed to 5s by adding email. Do you have a solution that is relatively simple ? now I am very confused that since I have opened a new thread to send em...
spyder win10 python3 from numpy.linalg import inv,qr generate a random matrix of 5 to 5 X = np.random.randn(5,5) first find the transpose of the matrix (.T), and then find the dot product (.dot) mat = X.T.dot(X) find the inverse of the matrix i...
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demand: IPIP, : 1IP 2H5 3phpPCip ...
when I first came into contact with the database, I was not proficient in many operations. I encountered some doubts as follows: the version of python used is 3.6 Code first: import sqlite3 from pathlib import Path def open_db(): root = Pa...
Today, I wonder if I see a question about reptiles. Just want to study the target page url: http: app1.sfda.gov.cn datas... Found that as long as F12 will automatically enter debug mode And turn off debugging after the mouse click on the page is unre...
Why can t JVM tuning be automated? ...
problem description A few questions arise in the book C Primer Plus. The original text is roughly as follows: Bytes are commonly used in computers. For all machines, 1 byte is 8 bits, which is the standard definition of bytes, at least in terms of me...
as shown in the figure below, there is a scroll bar on the page, and at the bottom is a block positioned by fixed, in which a select control of antd is placed. But when the page scrolls, the selection box pulled down by select scrolls along with the pag...
VScode starts the vue project by configuring launch.json. Half of running will report an error. The solution configuration is as follows: { "version": "0.2.0", "configurations": [ { "type": &...
need to achieve effect: the placeholder, input of simulated input hides ng-change, without content display, but there seems to be a conflict that cannot determine the undeffind of ng-model! problem: it seems impossible to use ng-model to determine whe...