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How to sort objects by multiple keys in Python?
...port itemgetter
comparers = [((itemgetter(col[1:].strip()), -1) if col.startswith('-') else
(itemgetter(col.strip()), 1)) for col in columns]
def comparer(left, right):
for fn, mult in comparers:
result = cmp(fn(left), fn(right))
if result:
...
Can I do a partial revert in GIT
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After the soft reset, you can also do git add -p to start an interactive session that allows you to selectively add chunks of files, instead of entire files. (There's also git reset -p to selectively unstage changes. Good to know, but probably not what you want in this scenari...
How to install a node.js module without using npm?
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You can clone the module directly in to your local project.
Start terminal. cd in to your project and then:
npm install https://github.com/repo/npm_module.git --save
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improve ...
What is the “Execute Around” idiom?
...ithFile.
This was frankly painful in Java because closures were so wordy, starting with Java 8 lambda expressions can be implemented like in many other languages (e.g. C# lambda expressions, or Groovy), and this special case is handled since Java 7 with try-with-resources and AutoClosable streams.
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Which $_SERVER variables are safe?
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In PHP every $_SERVER variable starting with HTTP_ can be influenced by the user. For example the variable $_SERVER['HTTP_REINERS'] can be tainted by setting the HTTP header REINERS to an arbitrary value in the HTTP request.
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Importing from a relative path in Python
...s actually pointing - it (prolly) isn't the directory you were in when you started python.
– CarlH
Jul 14 '14 at 16:51
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JPA or JDBC, how are they different?
...he DB. The most famous JPA provider is Hibernate, so it's a good place to start for concrete examples.
Other examples include OpenJPA, toplink, etc.
Under the hood, Hibernate and most other providers for JPA write SQL and use JDBC to read and write from and to the DB.
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How does “this” keyword work within a function?
...st of mine, here's more than you ever wanted to know about this.
Before I start, here's the most important thing to keep in mind about Javascript, and to repeat to yourself when it doesn't make sense. Javascript does not have classes (ES6 class is syntactic sugar). If something looks like a class,...
Optimistic vs. Pessimistic locking
... different version to yours) you abort the transaction and the user can re-start it.
This strategy is most applicable to high-volume systems and three-tier architectures where you do not necessarily maintain a connection to the database for your session. In this situation the client cannot actuall...
Why would you use Expression rather than Func?
... db.Set<T>.Where(conditionLambda);
}
}
This worked great until I started getting OutofMemoryExceptions on larger datasets. Setting breakpoints inside the lambda made me realize that it was iterating through each row in my table one-by-one looking for matches to my lambda condition. This st...