if ($(‘#A’).attr(‘myattr’)) { // attribute exists } else { // attribute does not exist } EDIT: The above will fall into the else-branch when myattr exists but is an empty string or “0”. If that’s a problem you should explicitly test on undefined: if ($(‘#A’).attr(‘myattr’) !== undefined) { // attribute exists } else { // … Read more
There are built-in functions called getattr and setattr getattr(object, attrname) setattr(object, attrname, value) In this case x = getattr(t, ‘attr1’) setattr(t, ‘attr1’, 21)
setattr(x, attr, ‘magic’) For help on it: >>> help(setattr) Help on built-in function setattr in module __builtin__: setattr(…) setattr(object, name, value) Set a named attribute on an object; setattr(x, ‘y’, v) is equivalent to “x.y = v”. However, you should note that you can’t do that to a “pure” instance of object. But it is … Read more
Before we write any code, let’s discuss the difference between attributes and properties. Attributes are the settings you apply to elements in your HTML markup; the browser then parses the markup and creates DOM objects of various types that contain properties initialized with the values of the attributes. On DOM objects, such as a simple … Read more
From Javascript: The Definitive Guide, it clarifies things. It notes that HTMLElement objects of a HTML doc define JS properties that correspond to all standard HTML attributes. So you only need to use setAttribute for non-standard attributes. Example: node.className=”test”; // works node.frameborder=”0″; // doesn’t work – non standard attribute node.setAttribute(‘frameborder’, ‘0’); // works
Use the xattr command. You can inspect the extended attributes: $ xattr s.7z com.apple.metadata:kMDItemWhereFroms com.apple.quarantine and use the -d option to delete one extended attribute: $ xattr -d com.apple.quarantine s.7z $ xattr s.7z com.apple.metadata:kMDItemWhereFroms you can also use the -c option to remove all extended attributes: $ xattr -c s.7z $ xattr s.7z xattr -h … Read more
In general, static means “associated with the type itself, rather than an instance of the type.” That means you can reference a static variable without having ever created an instances of the type, and any code referring to the variable is referring to the exact same data. Compare this with an instance variable: in that … Read more
Neither way is necessarily correct or incorrect, they are just two different kinds of class elements: Elements outside the __init__ method are static elements; they belong to the class. Elements inside the __init__ method are elements of the object (self); they don’t belong to the class. You’ll see it more clearly with some code: class … Read more
[Exception… “Component returned failure code: 0x80004002 (NS_NOINTERFACE) [nsIWebProgress.DOMWindow]” This means that there was no window assigned to the nsIWebProgress object. So it has nowhere to display data. nsresult: “0x80004002 (NS_NOINTERFACE)” location: “JS frame :: chrome://browser/content/tabbrowser.xml :: :: line 545” data: no] This is telling you what file is associated with that error. and what line … Read more
Update – 2020 Since this question was asked almost ten years ago, quite a bit has changed in Python itself since then. While the approach in my original answer is still valid for some cases, (e.g. legacy projects stuck to older versions of Python and cases where you really need to handle dictionaries with very … Read more