padding

I have seen this many a times that the prospect of a negative padding might help the development of CSS of certain page elements become better and easier. Yet, there is no provision for a negative padding in the W3C CSS. What is the reason behind this? Is there any obstruction to the property that prevents it's use as such? Thanks for your answers. UPDATE As I see, for example, in case you are using a font that has something, say, a 20px of vertical spacing, and you wish to apply a dashed border to the bottom of the font, say when a hyperlink appears. In such cases you'll find the style to be

Can I use String.Format() to pad a certain string with arbitrary characters? Console.WriteLine("->{0,18}<-", "hello"); Console.WriteLine("->{0,-18}<-", "hello"); returns -> hello<- ->hello <- I now want the spaces to be an arbitrary character. The reason I cannot do it with padLeft or padRight is because I want to be able to construct the format string at a different place/time then the formatting is actually executed. --EDIT-- Seen that there doesn't seem to be an existing solution to my problem I came up with this (after Think Before Coding's suggestion ) --EDIT2-- I needed some more complex

#coding:utf-8 import base64 from Crypto.Cipher import AES #解密 def aes_decode(data, key): try: aes = AES.new(str.encode(key), AES.MODE_ECB) # 初始化加密器 decrypted_text = aes.decrypt(base64.decodebytes(bytes(data, encoding='utf8'))).decode("utf8") # 解密 decrypted_text = decrypted_text[:-ord(decrypted_text[-1])] # 去除多余补位 except Exception as e: pass return decrypted_text #加密 def aes_encode(data, key): while len(data) % 16 != 0: # 补足字符串长度为16的倍数 data += (16 - len(data) % 16) * chr(16 - len(data) % 16) data = str.encode(data) aes = AES.new(str.encode(key), AES.MODE_ECB) # 初始化加密器 return str(base64

Q: I have a table in pg like so: CREATE TABLE t ( a BIGSERIAL NOT NULL , -- 8 b b SMALLINT , -- 2 b c SMALLINT , -- 2 b d REAL , -- 4 b e REAL , -- 4 b f REAL , -- 4 b g INTEGER , -- 4 b h REAL , -- 4 b i REAL , -- 4 b j SMALLINT , -- 2 b k INTEGER , -- 4 b l INTEGER , -- 4 b m REAL , -- 4 b CONSTRAINT a_pkey PRIMARY KEY (a) ); The above adds up to 50 bytes per row. My experience is that I need another 40% to 50% for system overhead, without even any user-created indexes to the above. So, about 75 bytes per row. I will have many, many rows in the table, potentially upward of 145 billion rows,

前言 本文是在GitHub上看到一个大牛总结的前端常见面试题，很多问题问的都很好，很经典、很有代表性。上面没有答案，我就整理了一下，从网上找了一些相关问题的答案。里面有一部分问题的答案我也没有进行考证，不少答案都来源于网络，或许会有疏漏之处，仅供大家参考哦！(还有一部分问题答案还未整理，大家也可以自己搜索一下答案) 1.你能描述一下渐进增强和优雅降级之间的不同吗? 优雅降级：Web站点在所有新式浏览器中都能正常工作，如果用户使用的是老式浏览器，则代码会检查以确认它们是否能正常工作。由于IE独特的盒模型布局问题，针对不同版本的IE的hack实践过优雅降级了,为那些无法支持功能的浏览器增加候选方案，使之在旧式浏览器上以某种形式降级体验却不至于完全失效. 渐进增强：从被所有浏览器支持的基本功能开始，逐步地添加那些只有新式浏览器才支持的功能,向页面增加无害于基础浏览器的额外样式和功能的。当浏览器支持时，它们会自动地呈现出来并发挥作用。 2.线程与进程的区别 一个程序至少有一个进程，一个进程至少有一个线程。线程的划分尺度小于进程，使得多线程程序的并发性高。 另外，进程在执行过程中拥有独立的内存单元，而多个线程共享内存，从而极大地提高了程序的运行效率。 线程在执行过程中与进程还是有区别的。每个独立的线程有一个程序运行的入口、顺序执行序列和程序的出口。但是线程不能够独立执行，必须依存在应用程序中