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how do you filter pandas dataframes by multiple columns
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Thanks for the elegant solution! I think it's the best out of all the rest. It combines the efficiency of using query with the versatility of having it as a function.
– A Merii
Jul 27 at 9:37
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XML Validation with XSD in Visual Studio IDE
...s same problem, but VS was referencing my schema correctly already. Turns out the file I was trying to validate didn't have an 'xml' file extension. Added .xml to the end of my filename, and the validation started to work.
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How to access accelerometer/gyroscope data from Javascript?
...thquake detecting" sample website uses a series of if statements to figure out which event to attach to (in a somewhat prioritized order) and passes the data received to a common tilt function:
if (window.DeviceOrientationEvent) {
window.addEventListener("deviceorientation", function () {
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Which equals operator (== vs ===) should be used in JavaScript comparisons?
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In the answers here, I didn't read anything about what equal means. Some will say that === means equal and of the same type, but that's not really true. It actually means that both operands reference the same object, or in case of value types, have the same value.
So, le...
Android preferences onclick event
...suming you use the following in your XML:
<Preference android:title="About" android:key="myKey"></Preference>
Then you can do the following in your code:
Preference myPref = (Preference) findPreference("myKey");
myPref.setOnPreferenceClickListener(new OnPreferenceClickListener() {
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Naming of ID columns in database tables
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Theres been a nerd fight about this very thing in my company of late. The advent of LINQ has made the redundant tablename+ID pattern even more obviously silly in my eyes. I think most reasonable people will say that if you're hand writing your SQL in...
How to import other Python files?
...efines a package argument for relative imports.
Update: Answer below is outdated. Use the more recent alternative above.
Just import file without the '.py' extension.
You can mark a folder as a package, by adding an empty file named __init__.py.
You can use the __import__ function. It takes the...
What are the GCC default include directories?
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In order to figure out the default paths used by gcc/g++, as well as their priorities, you need to examine the output of the following commands:
For C:
gcc -xc -E -v -
For C++:
gcc -xc++ -E -v -
The credit goes to Qt Creator ...
Difference between shadowing and overriding in C#?
...this:
A clA = new A();
B clB = new B();
Console.WriteLine(clA.Foo()); // output 5
Console.WriteLine(clA.Bar()); // output 5
Console.WriteLine(clB.Foo()); // output 1
Console.WriteLine(clB.Bar()); // output 1
//now let's cast B to an A class
Console.WriteLine(((A)clB).Foo()); // output 5 <<&...
Should __init__() call the parent class's __init__()?
...init defined (which it often doesn't). Therefore, people typically think about calling super method, rather than doing it out of principle.
– Martin v. Löwis
Sep 6 '09 at 14:47
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