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micro:bit 微控制器教程 · App Inventor 2 中文网
...t 传感器数据：
// 定期请求温度数据
when Clock1.Timer
do
if BluetoothLE1.IsConnected then
call BluetoothLE1.RequestTemperature
// 处理温度数据
when BluetoothLE1.TemperatureReceived temperature
do
set Label_Temperature.Text to "温度: " & temperature & "°C"
...
Java RegEx meta character (.) and ordinary dot?
In Java RegEx, how to find out the difference between . (dot) the meta character and the normal dot as we using in any sentence. How to handle this kind of situation for other meta characters too like ( * , + , \d ,...)
...
Fastest check if row exists in PostgreSQL
...to table, but these inserts are always done in batches. So I want to check if a single row from the batch exists in the table because then I know they all were inserted.
...
unable to install pg gem
...ative version of
latest release of pg (0.10.0) released
yesterday, but if you install 0.9.0 it
should install binaries without
issues.
share
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In Python, how do I convert all of the items in a list to floats?
...g numpy: np.array(inp_list, dtype=np.float32). You don't even have to specify if it's a float and just use: np.array(inp_list)
– Thomas Devoogdt
May 23 '18 at 13:40
...
What is the purpose of the reader monad?
...nstance Functor (Reader env) where
fmap f (Reader g) = Reader $ f . g
Now, to get a monad:
instance Monad (Reader env) where
return x = Reader (\_ -> x)
(Reader f) >>= g = Reader $ \x -> runReader (g (f x)) x
which is not so scary. ask is really simple:
ask = Reader $ \x -...
How to select an option from drop down using Selenium WebDriver C#?
...nt, you need to include the Selenium Webdriver Support package which is a different NuGet package than the Selenium WebDriver. Include the namespace OpenQA.Selenium.Support.UI.
– James Lawruk
May 28 '13 at 19:33
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How can I remove all my changes in my SVN working directory?
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if you also want to remove ignored files- svn cleanup . --remove-ignored
– Kip
Feb 22 '19 at 13:39
a...
Extract only right most n letters from a string
...
This aproach does not work correctly if the string is not as long as the number of characters required.
– stevehipwell
Nov 12 '09 at 13:59
1
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Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...
...权限
mysql> GRANT all privileges on extmail.* TO extmail@localhost IDENTIFIED BY 'extmail';
Query OK, 0 rows affected (0.00 sec)
mysql> GRANT all privileges on extmail.* TO extmail@127.0.0.1 IDENTIFIED BY 'extmail';
Query OK, 0 rows affected (0.00 sec)
3、安装配置apache
yum install ...