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python - Saving and loading multiple objects in pickle file?

I have a class that serves players in a game, creates them and other things. I need to save these player objects ... objects in a list? Is there a better way? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - How to check if a float value is a whole number

I am trying to find the largest cube root that is a whole number, that is less than 12,000. processing = ... rather cumbersome though. Is there a simpler way? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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How to achieve Base64 URL safe encoding in C#?

I want to achieve Base64 URL safe encoding in C#. In Java, we have the common Codec library which gives me an ... Is there is way to achieve URL safe encoding? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Python pandas insert list into a cell

I have a list 'abc' and a dataframe 'df': abc = ['foo', 'bar'] df = A B 0 12 NaN 1 23 NaN I want to insert the ... loc[1,'B'] = abc or df4.loc[1,'B'] = abc. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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ajax - Problems with jQuery getJSON using local files in Chrome

I have a very simple test page that uses XHR requests with jQuery's $.getJSON and $.ajax methods. The same ... that it seems to be working fine in Firefox. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Calculate difference between 2 date / times in Oracle SQL

I have a table as follows: Filename - varchar Creation Date - Date format dd/mm/yyyy hh24:mi:ss Oldest cdr ... ) between the two dates in Oracle SQL? Thanks Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Android difference between Two Dates

I have two date like: String date_1="yyyyMMddHHmmss"; String date_2="yyyyMMddHHmmss"; I want to print the difference like: 2d 3h 45m How can I do that? Thanks! Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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internet explorer - MSIE and addEventListener Problem in Javascript?

document.getElementById('container').addEventListener('copy',beforecopy,false ); In Chrome / Safari, the above will run ... 3rd parameter "False" is good for. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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.net - Like Operator in Entity Framework?

We're trying to implement the "LIKE" operator in Entity Framework for our entities with string fields, but ... standard wildcards and Linq to Entities code. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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multithreading - Python threading multiple bash subprocesses?

How does one use the threading and subprocess modules to spawn parallel bash processes? When I start ... processes run sequentially instead of in parallel. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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Error inflating class android.support.design.widget.NavigationView

I followed a tutorial of new component NavigationView in Support Design Library and can't get ... content.res.Resources$NotFoundException: Resource ID #0x0 Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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events - Javascript removeEventListener not working

I have the following code to add eventListener area.addEventListener('click',function(event) { app.addSpot( ... something like document.getElementById('myId') Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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css - nth-child doesn't respond to class

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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c - Stringification of a macro value

I faced a problem - I need to use a macro value both as string and as integer. #define RECORDS_PER_PAGE 10 /*... ... m not happy about it. How to get it right? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1 answer

r - How to count the number of unique values by group?

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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prolog - Reification of term equality/inequality

Pure Prolog programs that distinguish between the equality and inequality of terms in a clean manner suffer from execution ... open (at the end with []). Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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php - SELECT COUNT(*) AS count - How to use this count

Instead of doing: $cars = $mysqli->query("SELECT * FROM cars"); $count = $cars->num_rows(); if ($count) { // is ... value? I need to run an if statement on it. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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python - How to delete rows from a pandas DataFrame based on a conditional expression

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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193 views

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Create a custom event in Java

I want to do something like this in Java but I don't know the way: When event "object 1 say 'hello'" happens, ... ". Can somebody give me a hint or sample code? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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video - Streaming via RTSP or RTP in HTML5

I'm building a web app that should play back an RTSP/RTP stream from a server http://lscube.org/projects/feng. ... down to a VLC plugin or something like that. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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485 views

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python - How to animate a scatter plot

I'm trying to do an animation of a scatter plot where colors and size of the points changes at different stage of the ... over the index i. How do I do this? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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354 views

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r - Count number of occurences for each unique value

Let's say I have: v = rep(c(1,2, 2, 2), 25) Now, I want to count the number of times each unique value ... : #<doesn't work right> length(v[v==unique(v)]) Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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198 views

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c# - How to remove a lambda event handler

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asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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131 views

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python - String concatenation of two pandas columns

I have a following DataFrame: from pandas import * df = DataFrame({'foo':['a','b','c'], 'bar':[1, ... combine two columns in a DataFrame wasn't helpful for me. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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314 views

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Is a Java hashmap search really O(1)?

I've seen some interesting claims on SO re Java hashmaps and their O(1) lookup time. Can someone explain why this is ... (1) and, if so, how they achieve this? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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313 views

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javascript - How to configure CORS in a Spring Boot + Spring Security application?

I use Spring Boot with Spring Security and Cors Support. If I execute following code url = 'http:// ... /github.com/spring-projects/spring-boot/issues/5834 Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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543 views

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c++ - Connecting overloaded signals and slots in Qt 5

I'm having trouble getting to grips with the new signal/slot syntax (using pointer to member function) in Qt 5, as ... I doing wrong, and how can I fix it? Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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1.2k views

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javascript - Zoom Canvas to Mouse Cursor

I'm programming a HTML5 < canvas > project that involves zooming in and out of images using the scroll wheel. I ... and y relative to the center of the canvas. Question&Answers:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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