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Pandas dataframe get first row of each group
I have a pandas DataFrame like following.
5 Answers
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Troubleshooting “The use statement with non-compound name … has no effect”
...g namespace; it allows you to define an alias, not to "import" a namespace and thus henceforth omit the namespace qualifier altogether.
So, you could do:
use Blog\Article as BA;
... to shorten it, but you cannot get rid of it entirely.
Consequently, use Blog is useless, but I believe you coul...
Why is React's concept of Virtual DOM said to be more performant than dirty model checking?
...talk at ( Pete Hunt: React: Rethinking best practices -- JSConf EU 2013 ) and the speaker mentioned that dirty-checking of the model can be slow. But isn't calculating the diff between virtual DOMs actually even less performant since the virtual DOM, in most of the cases, should be bigger than mode...
How slow are .NET exceptions?
I don't want a discussion about when to and not to throw exceptions. I wish to resolve a simple issue. 99% of the time the argument for not throwing exceptions revolves around them being slow while the other side claims (with benchmark test) that the speed is not the issue. I've read numerous blogs,...
Knight's Shortest Path on Chessboard
I've been practicing for an upcoming programming competition and I have stumbled across a question that I am just completely bewildered at. However, I feel as though it's a concept I should learn now rather than cross my fingers that it never comes up.
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How are parameters sent in an HTTP POST request?
...or a post looks like one for a get, but with the verb POST instead of GET, and a content type value (and an optional content length value) as the request has content (body). Every type of request has a header, some types also have a body.
– Guffa
Jun 28 '16 at ...
Rebase a single Git commit
... to master.
git checkout master
git cherry-pick <commit ID of XX>
And remove the last commit from the feature branch with git reset.
git checkout Feature-branch
git reset --hard HEAD^
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event Action vs event EventHandler
Is there any different between declaring event Action<> and event EventHandler<> .
7 Answers
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Should I use pt or px?
What is the difference between pt and px in CSS? Which one should I use and why?
5 Answers
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How to see which commits in one branch aren't in the other?
I have two branches devel and next . In devel I have a more or less huge amount of commits. Some of the commits are cherry picked in next . Also I added some commits to next which are merged to devel .
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