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What is the purpose of setting a key in data.table?
I am using data.table and there are many functions which require me to set a key (e.g. X[Y] ). As such, I wish to understand what a key does in order to properly set keys in my data tables.
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Why use try {} finally {} with an empty try block?
... to determine
where you were before “try” was
interrupted by Abort and proceed from
there if you want to).
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create two method for same url pattern with different arguments
...}
@RequestMapping(value = "/searchUser", params = "userName")
public ModelAndView searchUserByName(@RequestParam String userName) {
// ...
}
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Standard alternative to GCC's ##__VA_ARGS__ trick?
...preprocessor features; you must use some extension to the language. clang and icc have adopted this GCC extension, but MSVC has not.
Back in 2001 I wrote up the GCC extension for standardization (and the related extension that lets you use a name other than __VA_ARGS__ for the rest-parameter) in ...
How do I remove all HTML tags from a string without knowing which tags are in it?
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Yes, because it strips everything between < and >, so in your case, < 10 <b> and </b> are both stripped.
– Bidou
Oct 3 '17 at 16:00
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How can I verify if a Windows Service is running
...dit: There is also a method sc.WaitforStatus() that takes a desired status and a timeout, never used it but it may suit your needs.
Edit: Once you get the status, to get the status again you will need to call sc.Refresh() first.
Reference: ServiceController object in .NET.
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Regular expression for a string containing one word but not another
I'm setting up some goals in Google Analytics and could use a little regex help.
4 Answers
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How to revert to origin's master branch's version of file
...is very different from your first two options in that it touches all files and not just the one file. You may want to point this out more explicitly. Also why not recommend git checkout HEAD filename and git checkout origin/master filename for options one and two, it would be more consistent?
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json.dumps vs flask.jsonify
I am not sure I understand the purpose of the flask.jsonify method. I try to make a JSON string from this:
5 Answers
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Why aren't variables declared in “try” in scope in “catch” or “finally”?
In C# and in Java (and possibly other languages as well), variables declared in a "try" block are not in scope in the corresponding "catch" or "finally" blocks. For example, the following code does not compile:
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