append

问题 A strange append of list in python. Here I defined a class class test: group = [] def __init__(self,name): self.name = str(name) Then I write those test0 = test(0) test1 = test(1) test_list = [test0, test1] I want to save test1.name into test0.group test_list[0].group.append(test_list[1].name) I print test0.group , it's ['1'] , everything is OK. But while I want to save test0.name into test1.group test_list[1].group.append(test_list[0].name) Then I print test1.group , it's ['1','0'] . I don't

问题 I'm constructing a form. No problem there. Aside of a submit button, I have another button that, when clicked, adds another field to the form. I am attempting to use javascript (jquery) to do this. Needless to say I am not having any luck. I have tried many different methods, and this is the one I gave up at: $("#snew").click(function () { var container = $("#sblc").add("div"); var content = "<select> <option>Domestic</option><option>Tiger</option><option>Peeled Raw</option><option>Cooked

问题 I have an Rscript that is reading in a constant stream of data in the form of a flat file. Another script picks up this flat file, does some parsing and processing, then saves the result as a data.frame in RDS format. It then sleeps, and repeats the process. saveRDS(tmp.df, file="H:/Documents/tweet.df.rds") #saving the data.frame On the second... nth iteration, I have the code only process the new lines added to the flat file since the previous iteration. However, in order to append the delta

问题 I can't figure this one out... Could someone please help me en explain how it works to? Goal: Adding a variable to a hard-coded URL, and put the new string into a href Example: var x = "1000"; var y = "http://www.google.com" var result = y + x; <a href="! the value of result !">click here...</a> Edit i'm sorry i meant y + x ofcourse... 回答1: Given this HTML code: <a href="" target="_blank">click here...</a> You would need this bit of js code: (working example http://jsfiddle.net/QUEZL) var x =

问题 I can't seem to get the appendTo to work. What do I do wrong? $('div:nth-child(2n) img').appendTo(parent); Current markup: <div class="container"> <img src="123.jpg" /> <p>Hey</p> </div> <div class="container"> <img src="123.jpg" /> <p>Hey</p> </div> I want this output: <div class="container"> <p>Hey</p> <img src="123.jpg" /> </div> <div class="container"> <p>Hey</p> <img src="123.jpg" /> </div> Please help me guys... I'm tearing my hair of every minute.. :-S 回答1: The following should suffice

问题 In one of the configuration files for my project I need to append some text. I am looking for some options to do this using Ant. I have found one option - to find something and replace that text with the new text, and the old values. But it does not seems to be promising, as if in future someone changes the original file the build will fail. So, I would like my script to add the text at the end of the file. What options do I have for such a requirement? 回答1: Use the echo task: <echo file=

问题 In one of the configuration files for my project I need to append some text. I am looking for some options to do this using Ant. I have found one option - to find something and replace that text with the new text, and the old values. But it does not seems to be promising, as if in future someone changes the original file the build will fail. So, I would like my script to add the text at the end of the file. What options do I have for such a requirement? 回答1: Use the echo task: <echo file=

问题 In one of the configuration files for my project I need to append some text. I am looking for some options to do this using Ant. I have found one option - to find something and replace that text with the new text, and the old values. But it does not seems to be promising, as if in future someone changes the original file the build will fail. So, I would like my script to add the text at the end of the file. What options do I have for such a requirement? 回答1: Use the echo task: <echo file=

问题 I do not want: $ cat file > dummy; $ cat header dummy > file I want similar to the command below but to the beginning, not to the end: $ cat header >> file 回答1: You can't append to the beginning of a file without rewriting the file. The first way you gave is the correct way to do this. 回答2: This is easy to do in sed if you can embed the header string directly in the command: $ sed -i "1iheader1,header2,header3" Or if you really want to read it from a file, you can do so with bash's help: $

问题 So I was interested in appending files to a zip archive and I came across a few users who asked this question before and another user gave this code snippet as a solution to that problem: public static void updateZip(File source, File[] files, String path){ try{ File tmpZip = File.createTempFile(source.getName(), null); tmpZip.delete(); if(!source.renameTo(tmpZip)){ throw new Exception("Could not make temp file (" + source.getName() + ")"); } byte[] buffer = new byte[4096]; ZipInputStream zin