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How to get first element in a list of tuples?
I have a list like below where the first element is the id and the other is a string:
12 Answers
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Comparing date ranges
In MySQL, If I have a list of date ranges (range-start and range-end). e.g.
10 Answers
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How to add an empty column to a dataframe?
What's the easiest way to add an empty column to a pandas DataFrame object? The best I've stumbled upon is something like
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How do you increase the max number of concurrent connections in Apache?
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Here's a detailed explanation about the calculation of MaxClients and MaxRequestsPerChild
http://web.archive.org/web/20160415001028/http://www.genericarticles.com/mediawiki/index.php?title=How_to_optimize_apache_web_server_for_maximum_concurrent_connections_or_increase_max_clients_in_apach...
How to remove/change JQuery UI Autocomplete Helper text?
...eature in JQuery UI 1.9.0, because I used JQuery UI plenty of times before and this text never poped up.
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Installing R with Homebrew
I'm trying to install R using Homebrew. I ran these commands which are recommended elsewhere on SO:
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Why shouldn't Java enum literals be able to have generic type parameters?
... the latter because of type erasure. But there is one thing I don't understand, Why can't I create an enum like this:
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Converting a Pandas GroupBy output from Series to DataFrame
...taFrame. It has a hierarchical index, though:
In [19]: type(g1)
Out[19]: pandas.core.frame.DataFrame
In [20]: g1.index
Out[20]:
MultiIndex([('Alice', 'Seattle'), ('Bob', 'Seattle'), ('Mallory', 'Portland'),
('Mallory', 'Seattle')], dtype=object)
Perhaps you want something like this?
In ...
Why must jUnit's fixtureSetup be static?
I marked a method with jUnit's @BeforeClass annotation, and got this exception saying it must be static. What's the rationale? This forces all my init to be on static fields, for no good reason as far as I see.
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Large-scale design in Haskell? [closed]
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I talk a bit about this in Engineering Large Projects in Haskell and in the Design and Implementation of XMonad. Engineering in the large is about managing complexity. The primary code structuring mechanisms in Haskell for managing complexity are:
The type system
Use the type system to ...