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Difference between len() and .__len__()?
..._len__, it's just a bit of sanity checking on the built-in that is missing from the magic method:
>>> class bah(object):
... def __len__(self): return "an inch"
...
>>> bah().__len__()
'an inch'
>>> len(bah())
Traceback (most recent call last):
File "<stdin>", ...
Is there a way to check if a file is in use?
...
You can suffer from a thread race condition on this which there are documented examples of this being used as a security vulnerability. If you check that the file is available, but then try and use it you could throw at that point, which a...
Logger slf4j advantages of formatting with {} instead of string concatenation
... if it is needed or not (the traditional "is debugging enabled" test known from log4j), and should be avoided if possible, as the {} allows delaying the toString() call and string construction to after it has been decided if the event needs capturing or not. By having the logger format a single stri...
iOS 7's blurred overlay effect using CSS?
...eat=css-regions)
The key part of this technique is to split apart content from layout by using CSS Region. First define a .content element with flow-into:content and then use the appropriate structure to blur the header.
The layout structure:
<div class="phone">
<div class="phone__displ...
How does git compute file hashes?
...object is hashed. I am not certain of the algorithm and parameters however from my observation it probably computes a hash based on all the blobs and trees (their hashes probably) it contains
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Difference between framework and static library in xcode4, and how to call them
... thanks it's clear, but how can I call a class in a static library from within a .m file ? Is it enough to call #import "MyClass.h", besides adding in "link binaries with libraries" ?
– Leonardo
Jun 5 '11 at 21:25
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Do declared properties require a corresponding instance variable?
...ponding @property. The Synthesizer only knows what type of attribute it is from the @property specification. The synthesize statement also allows you to rename properties, so that you can refer to a property by one name (shorthand) inside your code, but outside in the .h file use the full name. Howe...
Android Camera Preview Stretched
...en. This method will calculate screen ratio based on those values and then from the list of supportedPreviewSizes it will choose the best for you from avaliable ones. Get your supportedPreviewSize list in place where Camera object isn't null by using
mSupportedPreviewSizes = mCamera.getParameters...
How to convert JSON to CSV format and store in a variable
...if (ShowLabel) {
var row = "";
//This loop will extract the label from 1st index of on array
for (var index in arrData[0]) {
//Now convert each value to string and comma-seprated
row += index + ',';
}
row = row.slice(0, -1);
//append Label row with line break...
WebDriver: check if an element exists? [duplicate]
...u don't set the timeout driver.Manage().Timeouts().ImplicitlyWait(TimeSpan.FromSeconds(0));
It's actually a very simple and elegant once the method is created. By using FindElementSafe instead of FindElement, I don't "see" the ugly try/catch block and I can use a simple Exists method. That would l...