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How to raise a ValueError?
... ValueError instead of raise ValueError()?
– Tomasz Gandor
Sep 20 '19 at 15:14
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how to read System environment variable in Spring applicationContext
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-Dprop=... sets a java property in command line. You can read this property via System.getProperty("prop"). If you would like to read a OS property then use System.getenv("os-env-variable"). See javadoc: docs.oracle.com/javase/6/docs/api/java/lang/System.html
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Javascript sort array by two fields
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Nice and clean! The only thing it only works for numbers.
– Afanasii Kurakin
Jul 24 '19 at 7:40
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How to include layout inside layout?
How to include layout inside layout in Android?
6 Answers
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How to rename a single column in a data.frame?
...set the second column's name. Your object only has one column, so the command throws an error. This should be sufficient:
colnames(trSamp) <- "newname2"
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Disable Logback in SpringBoot
...configures itself to use Logback with Tomcat. I would like to disable this and use the one I provide in my classpath.
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R object identification
... often ending up with a function producing output for which I don't understand the output data type. I'm expecting a list and it ends up being a list of lists or a data frame or something else. What's a good method or workflow for figuring out the output data type when first using a function?
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How can I do division with variables in a Linux shell?
When I run commands in my shell as below, it returns an expr: non-integer argument error. Can someone please explain this to me?
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Changing user agent on urllib2.urlopen
... the Request itself, as the docs note:
headers should be a dictionary, and will be treated as if add_header() was called with each key and value as arguments. This is often used to “spoof” the User-Agent header, which is used by a browser to identify itself – some HTTP servers only allow r...
Where is Java Installed on Mac OS X?
I just downloaded Java 7u17 on Mac OS 10.7.5 from here and then successfully installed it. In order to do some JNI programming, I need to know where Java installed on my Mac.
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