ellipsis

问题 This came up in Hidden features of Python, but I can\'t see good documentation or examples that explain how the feature works. 回答1: You'd use it in your own class, since no builtin class makes use of it. Numpy uses it, as stated in the documentation. Some examples here. In your own class, you'd use it like this: >>> class TestEllipsis(object): ... def __getitem__(self, item): ... if item is Ellipsis: ... return "Returning all items" ... else: ... return "return %r items" % item ... >>> x =

问题 Where can I find documentation on the usage of ... in functions? Examples would be useful. 回答1: The word used to describe ... is "ellipsis." Knowing this should make searching for information about the construct easier. For example, the first hit on Google is another question on this site: How to use R's ellipsis feature when writing your own function? 回答2: A little example to get you started. f <- function(x, ...) { dots <- list(...) #1 if(length(dots) == 0) return(NULL) cat("The arguments

问题 I\'m sure all of us have seen ellipsis\' on Facebook statuses (or elsewhere), and clicked \"Show more\" and there are only another 2 characters or so. I\'d guess this is because of lazy programming, because surely there is an ideal method. Mine counts slim characters [iIl1] as \"half characters\", but this doesn\'t get around ellipsis\' looking silly when they hide barely any characters. Is there an ideal method? Here is mine: /** * Return a string with a maximum length of <code>length</code>

问题 I have a webpage with an elastic layout that changes its width if the browser window is resized. In this layout there are headlines ( h2 ) that will have a variable length (actually being headlines from blogposts that I don\'t have control over). Currently - if they are wider than the window - they are broken into two lines. Is there an elegant, tested (cross-browser) solution - for example with jQuery - that shortens the innerHTML of that headline tag and adds \"...\" if the text would be

问题 I have a collection of block elements on a page. They all have the CSS rules white-space, overflow, text-overflow set so that overflowing text is trimmed and an ellipsis is used. However, not all the elements overflow. Is there anyway I can use javascript to detect which elements are overflowing? Thanks. Added: example HTML structure I am working with. <td><span>Normal text</span></td> <td><span>Long text that will be trimmed text</span></td> The SPAN elements always fit in the cells, they

问题 Is it possible to limit a text length to \"n\" lines using CSS (or cut it when overflows vertically). text-overflow: ellipsis; only works for 1 line text. original text: Ultrices natoque mus mattis, aliquam, cras in pellentesque tincidunt elit purus lectus, vel ut aliquet, elementum nunc nunc rhoncus placerat urna! Sit est sed! Ut penatibus turpis mus tincidunt! Dapibus sed aenean, magna sagittis, lorem velit wanted output (2 lines): Ultrices natoque mus mattis, aliquam, cras in pellentesque

问题 I was playing around in python. I used the following code in IDLE: p = [1, 2] p[1:1] = [p] print p The output was: [1, [...], 2] What is this […] ? Interestingly I could now use this as a list of list of list up to infinity i.e. p[1][1][1].... I could write the above as long as I wanted and it would still work. EDIT: How is it represented in memory? What\'s its use? Examples of some cases where it is useful would be helpful. Any link to official documentation would be really useful. 回答1: It

问题 The R language has a nifty feature for defining functions that can take a variable number of arguments. For example, the function data.frame takes any number of arguments, and each argument becomes the data for a column in the resulting data table. Example usage: > data.frame(letters=c(\"a\", \"b\", \"c\"), numbers=c(1,2,3), notes=c(\"do\", \"re\", \"mi\")) letters numbers notes 1 a 1 do 2 b 2 re 3 c 3 mi The function\'s signature includes an ellipsis, like this: function (..., row.names =

问题 While idly surfing the namespace I noticed an odd looking object called \" Ellipsis \", it does not seem to be or do anything special, but it\'s a globally available builtin. After a search I found that it is used in some obscure variant of the slicing syntax by Numpy and Scipy... but almost nothing else. Was this object added to the language specifically to support Numpy + Scipy? Does Ellipsis have any generic meaning or use at all? D:\\workspace\\numpy>python Python 2.4.4 (#71, Oct 18 2006,

问题 Is there a solution to add ellipsis on last line inside a div with a fluid height (20%)? I found the -webkit-line-clamp function in CSS, but in my case the line number will be depending on window size. p { width:100%; height:20%; background:red; position:absolute; } <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Nulla sed dui felis. Vivamus vitae pharetra nisl, eget fringilla elit. Ut nec est sapien. Aliquam dignissim velit sed nunc imperdiet cursus. Proin arcu diam, tempus ac