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App Inventor 2 MQTT拓展入门（保姆级教程） · App Inventor 2 中文网
...工作
APPINVENTOR测试平台：AppInventor2中文网（https://www.fun123.cn）
MQTT拓展下载：MQTT中文文档页面进行下载。
MQTT测试平台：
中文平台推荐：bemfa.com 界面简洁，对入门者友好。当然也可以选择稍复杂...
Easy interview question got harder: given numbers 1..100, find the missing number(s) given exactly k
...1k + a2k + ... + akk = bk
Using Newton's identities, knowing bi allows to compute
c1 = a1 + a2 + ... ak
c2 = a1a2 + a1a3 + ... + ak-1ak
...
ck = a1a2 ... ak
If you expand the polynomial (x-a1)...(x-ak) the coefficients will be exactly c1, ..., ck - see Viète's formulas. Since every polynomial...
“User interaction is not allowed” trying to sign an OSX app using codesign
...s. Nothing helped until I tried the suggestion on http://devnet.jetbrains.com/thread/311971. Thanks ashish agrawal!
Login your build user via the GUI and open Keychain Access. Select your signing private key, right-click, choose Get Info, change to the Access Control tab and select the "Allow al...
What are the precise rules for when you can omit parenthesis, dots, braces, = (functions), etc.?
...a space and omit
the parentheses
As mentioned on the blog post: http://www.codecommit.com/blog/scala/scala-for-java-refugees-part-6 .
So perhaps this is actually a very strict "syntax sugar" which only works where you are effectively calling a method, on an object, which takes one parameter. e....
Convert line-endings for whole directory tree (Git)
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Fluent and Query Expression — Is there any benefit(s) of one over other?
...s me tons of time, and lines of code. However, the fluent syntax seems to come much more natural to me than the query expression syntax.
...
Determine on iPhone if user has enabled push notifications
...tumpotato pointed out, this answer no longer handles all cases and isn't a complete solution.
– DBD
Sep 17 '12 at 14:52
5
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Logical operators for boolean indexing in Pandas
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git clone through ssh
...me machine as my central git repository, I want put the repository in /var/www/vhosts/example.net. I already have /var/www/vhosts.
cd /var/www/vhosts
git clone file:///root/git/flowers.git example.net
If the production machine would also be on a different machine, the git clone command would loo...
How to use RSpec's should_raise with any kind of exception?
...
Note: raise_error is an alias for raise_exception.
Documentation: https://www.relishapp.com/rspec
RSpec 2:
https://www.relishapp.com/rspec/rspec-expectations/v/2-13/docs/built-in-matchers/raise-error-matcher
RSpec 1:
http://apidock.com/rspec/Spec/Matchers/raise_error
http://apidock.com/rspec/Spe...