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Python syntax for “if a or b or c but not all of them”
I have a python script that can receive either zero or three command line arguments. (Either it runs on default behavior or needs all three values specified.)
...
Convert a string representation of a hex dump to a byte array using Java?
...t i = 0; i < len; i += 2) {
data[i / 2] = (byte) ((Character.digit(s.charAt(i), 16) << 4)
+ Character.digit(s.charAt(i+1), 16));
}
return data;
}
Reasons why it is an improvement:
Safe with leading zeros (unlike BigInteger) and with negative by...
Javascript objects: get parent [duplicate]
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No. There is no way of knowing which object it came from.
s and obj.subObj both simply have references to the same object.
You could also do:
var obj = { subObj: {foo: 'hello world'} };
var obj2 = {};
obj2.subObj = obj.subObj;
var s = obj.subObj;
You now have thre...
npm install errors with Error: ENOENT, chmod
...ally install an npm module I just published. Every time I try to install, either from npm or the folder, I get this error.
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Eclipse executable launcher error: Unable to locate companion shared library
I had Eclipse Indigo installed on my computer with the Android plugin and it was working perfectly for about two weeks. Today, I updated java and quicktime then restarted my computer. When it booted back up, eclipse had completely vanished - all the program files have completely disappeared. When I ...
iPhone Keyboard Covers UITextField
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The usual solution is to slide the field (and everything above it) up with an animation, and then back down when you are done. You may need to put the text field and some of the other items into another view and slide the view as a unit. (I call these things "plates" as in "tectonic pl...
Should I use #define, enum or const?
...d systems so the following solution is based on the fact that integer and bitwise operators are fast, low memory & low in flash usage.
Place the enum in a namespace to prevent the constants from polluting the global namespace.
namespace RecordType {
An enum declares and defines a compile tim...
How to download a file with Node.js (without using third-party libraries)?
How do I download a file with Node.js without using third-party libraries ?
27 Answers
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Filter by property
Is it possible to filter a Django queryset by model property?
8 Answers
8
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__lt__ instead of __cmp__
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Yep, it's easy to implement everything in terms of e.g. __lt__ with a mixin class (or a metaclass, or a class decorator if your taste runs that way).
For example:
class ComparableMixin:
def __eq__(self, other):
return not ...