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Check if a given key already exists in a dictionary
I wanted to test if a key exists in a dictionary before updating the value for the key.
I wrote the following code:
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Given two directory trees, how can I find out which files differ by content?
If I want find the differences between two directory trees, I usually just execute:
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how to set a value for a span using JQuery
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You can do:
$("#submittername").text("testing");
or
$("#submittername").html("testing <b>1 2 3</b>");
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What's the difference between RANK() and DENSE_RANK() functions in oracle?
What's the difference between RANK() and DENSE_RANK() functions? How to find out nth salary in the following emptbl table?
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delete vs delete[] operators in C++
What is the difference between delete and delete[] operators in C++?
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Can I extend a class using more than 1 class in PHP?
If I have several classes with functions that I need but want to store separately for organisation, can I extend a class to have both?
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Python append() vs. + operator on lists, why do these give different results?
... the original array. The array.append operation inserts the array (or any object) into the end of the original array, which results in a reference to self in that spot (hence the infinite recursion).
The difference here is that the + operation acts specific when you add an array (it's overloaded lik...
plot a circle with pyplot
... find a straight-forward description on how to draw a circle with matplotlib.pyplot (please no pylab) taking as input center (x,y) and radius r. I tried some variants of this:
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How to install Hibernate Tools in Eclipse?
What is the proper way to install Hibernate Tools in Eclipse as a plugin?
The Hibernate site doesn't really give any instructions.
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Do Java arrays have a maximum size?
Is there a limit to the number of elements a Java array can contain? If so, what is it?
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