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sqlalchemy unique across multiple columns
... or to specify an explicit name, use the
UniqueConstraint or Index constructs explicitly.
As these belong to a Table and not to a mapped Class, one declares those in the table definition, or if using declarative as in the __table_args__:
# version1: table definition
mytable = Table('mytable', m...
How to convert a string to lower case in Bash?
... '$a'.upcase" | ruby`
Or Perl (probably my favorite):
b=`perl -e "print uc('$a');"`
Or PHP:
b=`php -r "print strtoupper('$a');"`
Or Awk:
b=`echo "$a" | awk '{ print toupper($1) }'`
Or Sed:
b=`echo "$a" | sed 's/./\U&/g'`
Or Bash 4:
b=${a^^}
Or NodeJS if you have it (and are a bi...
传感器组件 · App Inventor 2 中文网
...）和 -90（南）之间的值，其中 0 表示赤道。
经度
最新可用的经度值（以度为单位）报告到小数点后 5 位。
如果没有可用值，则返回 0。
经度是 180（东）和 -180（西）之间的值，其中 0 表示本初子午线。
锁定提...
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、...
...分
⚠️ 注意：不保证所有示例都使用了扩展的最新版本。尝试示例时，如有必要应重新加载最新版本。
关于通知
通知概述可在Android文档中查看：通知概述。
通知在单独的窗口（通知面板）中显...
How do you loop through each line in a text file using a windows batch file?
...n a text file using a Windows batch file and process each line of text in succession.
12 Answers
...
Why is it string.join(list) instead of list.join(string)?
...appears more an object-oriented approach whereas string.join(list) sounds much more procedural to me.
– Eduardo Pignatelli
Jan 14 '18 at 15:35
...
What's the meaning of “=>” (an arrow formed from equals & greater than) in JavaScript?
...It Is
This is an arrow function. Arrow functions are a short syntax, introduced by ECMAscript 6, that can be used similarly to the way you would use function expressions. In other words, you can often use them in place of expressions like function (foo) {...}. But they have some important difference...
企业级负载平衡简介 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...地大，从而使得单次哈希计算的速度变长，增加恶意人员破解密码的难度。反过来，如果有一百个人或者一千个人同时执行登陆操作，那么这么繁琐的哈希计算将导致登陆服务器产生“忙不过来”的情况。此时我们就需要使用负...
Python executable not finding libpython shared library
...
Can you debug the application successfully when you run gdb from the command line and LD_LIBRARY_PATH is set up properly in the terminal? If not, you will probably have to set up LD_LIBRARY_PATH in your .gdbinit file. See this answer for more info: stackov...
ZeroMQ的学习和研究（PHP代码实例） - C/C++ - 清泛网 - 专注C/C++及内核技术
...我们将 WEB 代码部署到集群上的时候，如果需要实时的将最新的配置信息，主动的推送到各个机器节点。在此过程中，我们一定要保证，各个节点收到的信息的一致性和正确性，如果使用 HTTP，由于他的无状态性，我们无法保证...