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Concatenating two lists - difference between '+=' and extend()
...F instruction, but for += it will use LOAD_FAST - and you get *UnboundLocalError: local variable 'l' referenced before assignment*
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搭建高可用mongodb集群（四）—— 分片 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...前几篇文章。
任意登陆一个机器，比如登陆192.168.0.136，连接mongodb
#设置第一个分片副本集
/data/mongodbtest/mongodb-linux-x86_64-2.4.8/bin/mongo 127.0.0.1:22001
#使用admin数据库
use admin
#定义副本集配置
config = { _id:"shard1", members:[
...
What do *args and **kwargs mean? [duplicate]
... @PaulD.Waite: No problem. I wonder how many rookies found this error by trying to use your code, but were telling themselves "I must be doing something wrong here, this answer has so many votes" ;) Another upvote from me, because it is very clear and very good.
– Ta...
PHP code to convert a MySQL query to CSV [closed]
...ELECT * FROM table_name";
$export = mysql_query ( $select ) or die ( "Sql error : " . mysql_error( ) );
$fields = mysql_num_fields ( $export );
for ( $i = 0; $i < $fields; $i++ )
{
$header .= mysql_field_name( $export , $i ) . "\t";
}
while( $row = mysql_fetch_row( $export ) )
{
$line...
Generate random numbers with a given (numerical) distribution
...
@stackoverflowuser2010: It shouldn't matter (modulo errors in floating point)
– sdcvvc
Jun 7 '13 at 12:52
...
Notifier 通知扩展：功能强大的Android通知管理工具，支持通知通道、意图、...
...化。可以使用哪些HTML标签取决于Android系统的实现。有关提示，请参见：
Mark Murphy’s Technical Stuff
Daniel Lew’s Coding Thoughts
关于权限
Android 13（SDK版本33）引入了 Manifest.permission.POST_NOTIFICATIONS 权限。必须授...
Are lists thread-safe?
...s but keep the numbers big enough and run a few times and you will see the error
The FLAWED version
import threading
import time
# Change this number as you please, bigger numbers will get the error quickly
count = 1000
l = []
def add():
for i in range(count):
l.append(i)
tim...
C++ 通过主机名/域名获取IP - C/C++ - 清泛网 - 专注C/C++及内核技术
...件定义了Socket编程的功能 #pragma comment(lib,"ws2_32.lib") 连接ws2_32.lib库...代码如下：
#include <winsock2.h> //该头文件定义了Socket编程的功能
#pragma comment(lib,"ws2_32.lib") //连接ws2_32.lib库.只要程序中用到Winsock API 函数，都要用到 Ws2...
Encoding URL query parameters in Java
... URL or by Mr. Sindi in this thread.
URIUtil of Apache httpclient is really useful, although there are some alternatives
URIUtil.encodeQuery(url);
For example, it encodes space as "+" instead of "%20"
Both are perfectly valid in the right context. Although if you really preferred you cou...
configure: error: Unable to find gd.h anywhere under /usr/local/gd - ...
...d gd.h anywhere under错误
编译PHP的--with-gd=/usr/include
错误提示：
configure: error: Unable to find gd.h anywhere under
表明已经装好GD库啦，把后面的路径取消就可以啦
--with-gd --with-jpeg --with-png
ok
一般到这里就可以解决。
解决方式...