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How does collections.defaultdict work?
I've read the examples in python docs, but still can't figure out what this method means. Can somebody help? Here are two examples from the python docs
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How to make join queries using Sequelize on Node.js
...d of selecting from two tables, but the result should be the same
Further reading:
http://docs.sequelizejs.com/en/latest/docs/associations/#one-to-one-associations
http://docs.sequelizejs.com/en/latest/docs/associations/#one-to-many-associations
http://docs.sequelizejs.com/en/latest/docs/models-u...
Algorithm to find Largest prime factor of a number
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Please read and/or run this code before voting it down. It works fine. Just copy and paste. As written prime_factors(1000) will return [2,2,2,5,5,5], which should be interpreted as 2^3*5^3, a.k.a. the prime factorization.
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if A vs if A is not None:
... what you really want to check. These things can be hard to debug since is reads like prose that we often just skim over it.
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Difference between Arrays.asList(array) and new ArrayList(Arrays.asList(array))
... the wrapper, like adding or removing elements from the list, you can only read or overwrite the elements.
Note that the list wrapper doesn't extend ArrayList - it's a different kind of object. ArrayLists have their own, internal array, in which they store their elements, and are able to resize the...
Mercurial: how to amend the last commit?
...new "Phases" feature to prevent updates that would change history that's already been made available outside of the local repository.
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What does enumerable mean?
...g explicit can be a solid decision just so that it's clear to anyone who's reading your code.
– carpeliam
Jul 28 '13 at 20:57
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Dynamically Changing log4j log level
...the life cyle of the Logger. On reinitialization the configuration will be read and used as setting the level at runtime does not persist the level change.
UPDATE: If you are using Log4j 2 you should remove the calls to setLevel per the documentation as this can be achieved via implementation class...
What's the best way to iterate over two or more containers simultaneously
... {
a = b;
}
The implementation of zip is left as an exercise for the reader, but it follows easily from the implementation of indices.
(Before C++17 you’d have to write the following instead:)
for (auto items&& : zip(containerA, containerB))
get<0>(items) = get<1>(i...
npm command to uninstall or prune unused packages in Node.js
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If I read that correctly, this would remove all sub-dependencies, since they're not listed in package.json. Is that right? So, the next update or install would have to reinstall them.
– nshew
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