大约有 2,100 项符合查询结果（耗时：0.0120秒） [XML]
TCP 的那些事儿（上） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...Linux设置成了30s）为什么要这有TIME_WAIT？为什么不直接给转成CLOSED状态呢？主要有两个原因：1）TIME_WAIT确保有足够的时间让对端收到了ACK，如果被动关闭的那方没有收到Ack，就会触发被动端重发Fin，一来一去正好2个MSL，2）有足...
Remove duplicated rows
I have read a CSV file into an R data.frame. Some of the rows have the same element in one of the columns. I would like to remove rows that are duplicates in that column. For example:
...
Simple way to encode a string according to a password?
...re cipher. It is one of the strongest of the simple ancient ciphers.
Vigenère cipher
It's quick and easy to implement. Something like:
import base64
def encode(key, string):
encoded_chars = []
for i in xrange(len(string)):
key_c = key[i % len(key)]
encoded_c = chr(ord(st...
windbg 备忘 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...命令之断点
bl 列取已下的断点，以及其状态
.bpcmds 简单列表显示断点
bp/bu/bm 设置一个断点
bp: 可以对地址(bp 0×1234567)以及符号(bp thApp!somefunction)下断点，对于使用对符号下断点，如果符号了修改，断点依然存在，但不一定...
RESTful on Play! framework
...tUser method based on the Accept header?
– Timo Westkämper
Dec 7 '10 at 21:19
it is, but not entirely reliable. If pl...
How to split a comma-separated string?
...
A comma delimited file (csv) might have a a comma in quotes, meaning it's not a delimiter. In this case Split will not work.
– Steven Trigg
Mar 8 '14 at 2:35
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HTML Submit-button: Different value / button-text?
...re suggestion in comments:
<input type="submit" name="add_tag" value="Lägg till tag" />
In your server side, you'll do something like:
if (request.getParameter("add_tag") != null)
tags.addTag( /*...*/ );
(Since I don't know that language (java?), there may be syntax errors.)
I woul...
What is the difference between a web API and a web service?
...s not mean it SOAP base service REST also support Command Separated Value (CSV), JavaScript Object Notation (JSON) and Really Simple Syndication (RSS).
– Adiii
Aug 12 '17 at 4:03
...
How can I trim leading and trailing white space?
...le the trailing white spaces when you read your data file. If you use read.csv or read.table you can set the parameterstrip.white=TRUE.
If you want to clean strings afterwards you could use one of these functions:
# Returns string without leading white space
trim.leading <- function (x) sub("^\\...
社会化海量数据采集爬虫框架搭建 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...框架（参考）。xpath 是一种结构化网页元素选择器，支持列表和单节点数据获取，他的好处可以支持规整网页数据抓取。我们使用的是google插件 XPath Helper，这个玩意可以支持在网页点击元素生成xpath，就省去了自己去查找xpath的...