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Why is it faster to check if dictionary contains the key, rather than catch the exception in case it
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On the one hand, throwing exceptions is inherently expensive, because the stack has to be unwound etc.
On the other hand, accessing a value in a dictionary by its key is cheap, because it's a fast, O(1) operation.
BTW: The correct way t...
How to extract the hostname portion of a URL in JavaScript
...ibility for window.location.origin is not clear. I've checked it in chrome and it returned http://sub.domain.com:port if the port is anything but 80, and http://sub.domain.com if the port is 80.
Special thanks to @torazaburo for mentioning that to me.
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Access-control-allow-origin with multiple domains
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There can only be one Access-Control-Allow-Origin response header, and that header can only have one origin value. Therefore, in order to get this to work, you need to have some code that:
Grabs the Origin request header.
Checks if the origin value is one of the whitelisted values.
If it i...
How to convert a Base64 string into a Bitmap image to show it in a ImageView?
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make sure you are not passing the "data:image/jpg;base64" and pass only the image bytes.. Don't forget to change the string to bytes.. photoData = photoData.substring(photoData.indexOf(",") + 1); byte[] decodedString = Base64.decode(photoData.getBytes(), Base64.DEFAULT); Hope it ...
Aren't Python strings immutable? Then why does a + “ ” + b work?
My understanding was that Python strings are immutable.
22 Answers
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How do I uninstall a package installed using npm link?
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The package can be uninstalled using the same uninstall or rm command that can be used for removing installed packages. The only thing to keep in mind is that the link needs to be uninstalled globally - the --global flag needs to be provided.
In order to uninstall the globally linked foo p...
TypeError: sequence item 0: expected string, int found
... data from a dictionary into a database. I want to iterate over the values and format them accordingly, depending on the data type. Here is a snippet of the code I am using:
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Python argparse ignore unrecognised arguments
Optparse, the old version just ignores all unrecognised arguments and carries on. In most situations, this isn't ideal and was changed in argparse. But there are a few situations where you want to ignore any unrecognised arguments and parse the ones you've specified.
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Opacity of background-color, but not the text [duplicate]
.../css-background-transparency-without-affecting-child-elements-through-rgba-and-filters/
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Is there an easy way to strike through text in an app widget?
...s wondering if there is an easy way to strike text within an app widget in Android. In a normal activity, it is pretty easy, using textview flags:
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