how do I dynamically resize a pixbuf cellrenderer in a treeview?

由 末鹿安然 提交于 2021-02-20 19:33:22
问题 I'm using a Gtk3 TreeView that looks like above. The model is a Gtk.TreeStore Gtk.TreeStore(str, GdkPixbuf.Pixbuf) For the picture I could add to the model the correctly sized images via: pixbuf.scale_simple(48,48,GdkPixbuf.InterpType.BILINEAR) However I'm also using the model elsewhere showing the pixbufs in a different manner and the pixbufs can also be a variety of sizes. What I would like to do is force the size of the picture displayed at run-time. The question is - how do I do that? I

Why is my superclass calling my subclass method?

由 ￣綄美尐妖づ 提交于 2021-02-20 19:33:09
问题 When I call a method that was overrided from my constructor, I am getting an error and it says that it is missing an argument (due to the subclass requiring a second argument). However, I called the method in the super(), so why doesn't it call the super class version of that method? This is best illustrated with a short example: class A: def __init__(self): self.do() def do(self): print("A") class B(A): def __init__(self): super().__init__() self.do("B") def do(self, arg2): super().do()

Find most frequent row or mode of a matrix of vectors - Python / NumPy

由 懵懂的女人 提交于 2021-02-20 19:32:53
问题 I have a numpy array of shape (?,n) that represents a vector of n-dimensional vectors. I want to find the most frequent row. So far it seems that the best way is to just iterate over all the entries and store a count, but it seems obscene that numpy or scipy wouldn't have something builtin to perform this task. 回答1: Here's an approach using NumPy views , which should be pretty efficient - def mode_rows(a): a = np.ascontiguousarray(a) void_dt = np.dtype((np.void, a.dtype.itemsize * np.prod(a

What is the relationship between threads (in a Java or a C++ program) and number of cores in the CPU?

由 核能气质少年 提交于 2021-02-20 19:32:13
问题 Can someone shed some light on it? An i7 processor can run 8 threads but I am pretty sure we can create more than 8 threads in a JAVA or C++ program(not sure though). I have an i5 processor and while studying concurrency I have created 10 threads for assignments. I am just trying to understand how Core rating of CPU is related to threads. 回答1: The thread you are refering to is called a software thread ; and you can create as many software threads as you need, as long as your operating system

Why indexOf in javascript not working?

由 a 夏天 提交于 2021-02-20 19:31:31
问题 I'm not sure what I'm doing wrong here. The first instance that I use indexOf it works perfectly fine, but when I use it the second time it's not returning the result that I'm expecting. function mutation(arr) { //return arr; res = ""; for (var x=0; x<arr[1].split("").length; x++) { if (arr[0].indexOf(arr[1].split("")[x]) !== -1) { res += "t"; } else { res += "f"; } } // res = ttt if (res.indexOf("f") !== -1) { return true; } else { return false; } } mutation(["hello", "hey"]); // this

What is the .empty file for?

由 喜夏-厌秋 提交于 2021-02-20 19:31:30
问题 I've recently come across a situation when an "empty" folder used by an application contains a .empty file. For example, an application has a folder for logs, and when there are no logs yet, this folder contains a .empty file. Even when there already are log files, this file isn't deleted. I've opened the file, and it is empty, so I assume it contains no useful information except that the file itself is present. What's the purpose of this empty file? P.S. My only guess is that this file is

HTML opacity attribute vs CSS opacity

由 ♀尐吖头ヾ 提交于 2021-02-20 19:31:11
问题 I know of two different ways of setting opacity in HTML: <div opacity="0.5"></div> and <div style="opacity: 0.5;"></div> I also know how to set both of those in JavaScript: div.setAttribute("opacity", 0.5); and div.style.opacity = 0.5 Are there any major differences between those two methods? Should I prefer one over the other? (I guess I should at least be consistent) 回答1: The only opacity attribute I am aware of is for use with SVGs: Example Elements The following elements can use the

交流群招人

由 ℡╲_俬逩灬. 提交于 2021-02-20 19:30:28
欢迎关注「前端试炼」公众号，深耕前端垂直领域，分享一些前端方面实用或有意思的东西，专注深度和最佳实践，旨在打造一个高质量的公众号。 如果你想交流技术、答疑解惑，请教大神， 回复 交流群 如果你只是想静静看每日精选文章， 回复 文章群 如果是想内推 or 被内推，或者在准备面试， 回复 面试群 如果是 React or Vue， 回复 React 、 Vue 加好友回复哈，你没加我好友我没法拉你进群啊。。 扫码加微信，回复关键词。 本文分享自微信公众号 - 前端试炼（code-photo）。 如有侵权，请联系 support@oschina.cn 删除。 本文参与“ OSC源创计划 ”，欢迎正在阅读的你也加入，一起分享。 来源： oschina 链接： https://my.oschina.net/u/3347851/blog/4957788

Java ---- 遍历链表（递归与非递归实现）

由 风格不统一 提交于 2021-02-20 19:30:13
package test; // 前序遍历的递归实现与非递归实现 import java.util.Stack; public class Test { public static void main(String[] args) { TreeNode[] node = new TreeNode[10]; // 以数组形式生成一棵完全二叉树 for ( int i = 0; i < 10; i++ ) { node[i] = new TreeNode(i); } for ( int i = 0; i < 10; i++ ) { if (i*2+1 < 10 ) node[i].left = node[i*2+1 ]; if (i*2+2 < 10 ) node[i].right = node[i*2+2 ]; } preOrderRe(node[ 0 ]); } public static void preOrderRe(TreeNode biTree) { // 递归实现 System.out.println(biTree.value); TreeNode leftTree = biTree.left; if (leftTree != null ) { preOrderRe(leftTree); } TreeNode rightTree = biTree.right; if

webdriver-manager update throwing Error: connect ETIMEDOUT

由 情到浓时终转凉″ 提交于 2021-02-20 19:30:09
问题 I'm getting ETIMEDOUT error while installing webdriver-manager updated . Find the error details as below: C:\Users\....> webdriver-manager update webdriver-manager: using global installed version 12.0.6 events.js:160 throw er; // Unhandled 'error' event ^ Error: connect ETIMEDOUT XX.XXX.XX.XXX:XXX at Object.exports._errnoException (util.js:1018:11) at exports._exceptionWithHostPort (util.js:1041:20) at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1086:14) Also when I tried to ping the
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