OStack Q&A-Knowledge Sharing Community

0 votes

99 views

1 answer

Convert a date format in PHP

This question already has answers here: Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

157 views

1 answer

python - Why does += behave unexpectedly on lists?

The += operator in python seems to be operating unexpectedly on lists. Can anyone tell me what is going ... operator is called a "compound assignment operator". Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

99 views

1 answer

What are type hints in Python 3.5?

One of the most talked-about features in Python 3.5 is type hints. An example of type hints is mentioned in this ... and when they should be used and when not? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

84 views

1 answer

java - What is x after "x = x++"?

What happens (behind the curtains) when this is executed? int x = 7; x = x++; That is, when a variable is ... . In my book, it says that x is incremented! Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

73 views

1 answer

Lazy Method for Reading Big File in Python?

I have a very big file 4GB and when I try to read it my computer hangs. So I want to read it piece by ... these pieces ? I would love to have a lazy method. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

223 views

1 answer

python - Does pandas iterrows have performance issues?

I have noticed very poor performance when using iterrows from pandas. Is this something that is experienced by ... (max(calculation)) return t2info.ix[maxrow] Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

268 views

1 answer

Difference between matches() and find() in Java Regex

I am trying to understand the difference between matches() and find(). According to the Javadoc, (from what I ... useful to use matches() instead of find()? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

99 views

1 answer

html - Centering in CSS Grid

I'm trying to create a simple page with CSS Grid. What I'm failing to do is center the text from the HTML to the respective ... > <p>Hire me!</p> </div> </div> Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

213 views

1 answer

php - PDO support for multiple queries (PDO_MYSQL, PDO_MYSQLND)

I do know that PDO does not support multiple queries getting executed in one statement. I've been Googleing and ... way now to run multiple queries using PDO. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

249 views

1 answer

matlab - Subscript indices must either be real positive integers or logicals, generic solution

The following error occurs quite frequently: Subscript indices must either be real positive integers or logicals I ... solution for dealing with this problem. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

202 views

1 answer

Javafx tableview not showing data in all columns

OK, new to java by several weeks, but have been programming for 30 years. The following code executes, but only the first ... (String c) { CDesc = c; } } } Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

95 views

1 answer

Read/write to Windows registry using Java

How is it possible to read/write to the Windows registry using Java? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

306 views

1 answer

python - How to replace multiple substrings of a string?

I would like to use the .replace function to replace multiple strings. I currently have string.replace(" ... 2 to replace fields to certain search strings Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

182 views

1 answer

javascript - Detect changes in the DOM

I want to execute a function when some div or input are added to the html. Is this possible? For example, ... is added, then the function should be called. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

251 views

1 answer

html - When flexbox items wrap in column mode, container does not grow its width

I am working on a nested flexbox layout which should work as follows: The outermost level (ul#main) is a ... at least does not break useability too much. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

136 views

1 answer

c++ - Why can't variables be declared in a switch statement?

I've always wondered this - why can't you declare variables after a case label in a switch statement? In C+ ... other languages too. Why is this such a problem? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

530 views

1 answer

r - Add legend to ggplot2 line plot

I have a question about legends in ggplot2. I managed to plot three lines in the same graph and want to add a legend with the ... ,24,13.3,17.32,-99.9,8.4,3.49 Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

198 views

1 answer

python - What is the purpose and use of **kwargs?

This question already has answers here: Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

372 views

1 answer

apache - Tips for debugging .htaccess rewrite rules

Many posters have problems debugging their RewriteRule and RewriteCond statements within their .htaccess ... ?php phpinfo(INFO_ENVIRONMENT|INFO_VARIABLES); Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

359 views

1 answer

html - How to make an element width: 100% minus padding?

I have an html input. The input has padding: 5px 10px; I want it to be 100% of the parent div's width(which ... 100% + 20px how can I get around this? Example Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

956 views

1 answer

indexing - How can I index a MATLAB array returned by a function without first assigning it to a local variable?

For example, if I want to read the middle value from magic(5), I can do so like this: M = magic(5 ... an array/matrix without first assigning it to a variable? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

284 views

1 answer

python - How to find all occurrences of an element in a list

index() will give the first occurrence of an item in a list. Is there a neat trick which returns all indices in a list for an element? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

174 views

1 answer

regex - JavaScript + Unicode regexes

How can I use Unicode-aware regular expressions in JavaScript? For example, there should be something akin to w that can ... like [[P*]] for punctuation, etc. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

139 views

1 answer

c - Why does clang produce inefficient asm with -O0 (for this simple floating point sum)?

I am disassembling this code on llvm clang Apple LLVM version 8.0.0 (clang-800.0.42.1): int main() { ... is always right, why did it choose this strategy? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

124 views

1 answer

Understanding generators in Python

I am reading the Python cookbook at the moment and am currently looking at generators. I'm finding it hard ... with examples, if you're feeling generous! Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

286 views

1 answer

floating point - Retain precision with double in Java

public class doublePrecision { public static void main(String[] args) { double total = 0; total += 5.6; total += 5.8; ... print (or be able to use it as) 11.4? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

304 views

1 answer

string - Extract filename and extension in Bash

I want to get the filename (without extension) and the extension separately. The best solution I found so far is: ... for this, if possible. Any better ideas? Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

0 votes

227 views

1 answer

assembly - Referencing the contents of a memory location. (x86 addressing modes)

I have a memory location that contains a character that I want to compare with another character (and it's not ... it? Basically how do I do it syntactically. Question&Answers:os...

asked Oct 16, 2021 in Technique[技术] by 深蓝 (71.8m points)

Categories

Recent questions

Just Browsing Browsing

Most popular tags