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Inheritance and Overriding __init__ in python
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The book is a bit dated with respect to subclass-superclass calling. It's also a little dated with respect to subclassing built-in classes.
It looks like this nowadays:
class FileInfo(dict):
"""store file metadata"""
def __init__(self, filename=None):
super(FileInfo,...
Write to UTF-8 file in Python
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I believe the problem is that codecs.BOM_UTF8 is a byte string, not a Unicode string. I suspect the file handler is trying to guess what you really mean based on "I'm meant to be writing Unicode as UTF-8-encoded text, but you've given me a byte string!"
Try writing the Unicode st...
How to change ProgressBar's progress indicator color in Android
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I copied this from one of my apps, so there's prob a few extra attributes, but should give you the idea. This is from the layout that has the progress bar:
<ProgressBar
android:id="@+id/ProgressBar"
style="?android:attr/progressBarStyleHorizontal"
android:layout_wi...
.NET Process.Start default directory?
...EMROOT%\system32.
You can determine the value of %SYSTEMROOT% by using:
string _systemRoot = Environment.GetEnvironmentVariable("SYSTEMROOT");
Here is some sample code that opens Notepad.exe with a working directory of %ProgramFiles%:
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using System.Diagnostics;
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ProcessStartInfo _proc...
Android Text over image
...droid:text="Look at the drawable below"/>
With this you don't need an extra ImageView. It's also possible to use two drawables on more than one side of the TextView.
The only problem you will face by using this, is that the drawable can't be scaled the way of an ImageView.
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How to perform a real time search and filter on a HTML table
... this approach because it is quite resource consuming. Put all the refined strings into an array of objects with two fields: a reference to the <tr> DOMElement and the string. This way, on keyup() you search those strings (which is way faster) and have the corresponding rows ready to be manipu...
Hidden features of Ruby
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If items is a string you don't have to enclose it with [*…]. String.each doesn't iterate over characters as some may expect. It just returns itself to the block.
– mxcl
Feb 17 '10 at 13:49
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What are forward declarations in C++?
...ractise and I recommend trying it. However, it can take a some effort and extra lines of code that may need to be maintained and updated if type names etc are still being changed (although tools are getting better at renaming stuff automatically). So there is a tradeoff. I've seen code bases where ...
Should the folders in a solution match the namespace?
...fit in my opinion of using multiple namespaces in large projects is having extra organization when viewing classes in any tooling that displays classes in a namespaces hierarchy. Even documentation. Obviously having just one namespace in the project results in all classes being displayed in a single...
Object.getOwnPropertyNames vs Object.keys
...rence is in case of array Object.getOwnPropertyNames method will return an extra property that is length.
var x = ["a", "b", "c", "d"];
Object.keys(x); //[ '0', '1', '2', '3' ]
Object.getOwnPropertyNames(x); //[ '0', '1', '2', '3', 'length' ]
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