Add lines to existing file using Python
Open the file for ‘append’ rather than ‘write’. with open(‘file.txt’, ‘a’) as file: file.write(‘input’)
append
Python JSON dump / append to .txt with each variable on new line
Your question is a little unclear. If you’re generating hostDict in a loop: with open(‘data.txt’, ‘a’) as outfile: for hostDict in ….: json.dump(hostDict, outfile) outfile.write(‘\n’) If you mean you want each variable within hostDict to be on a new line: with open(‘data.txt’, ‘a’) as outfile: json.dump(hostDict, outfile, indent=2) When the indent keyword argument is set … Read more
How to allow list append() method to return the new list
Don’t use append but concatenation instead: yourList = myList + [40] This returns a new list; myList will not be affected. If you need to have myList affected as well either use .append() anyway, then assign yourList separately from (a copy of) myList.
StringBuilder append() and null values
You can do a check on the object before appending it: sb.append(“Value: “); if (s != null) sb.append(s); System.out.println(sb); A key point to make is that null is not the same an an empty String. An empty String is still a String object with associated methods and fields associated with it, where a null pointer … Read more
Creating a LinkedList class from scratch
If you’re actually building a real system, then yes, you’d typically just use the stuff in the standard library if what you need is available there. That said, don’t think of this as a pointless exercise. It’s good to understand how things work, and understanding linked lists is an important step towards understanding more complex … Read more
jQuery: append() object, remove() it with delay()
Using setTimeout() directly (which .delay() uses internally) is simpler here, since .remove() isn’t a queued function, overall it should look like this: $(‘body’).append(“<div class=”message success”>Upload successful!</div>”); setTimeout(function() { $(‘.message’).remove(); }, 2000); You can give it a try here. .delay() is for the animation (or whatever named) queue, to use it you’d have to do something … Read more
Getting the height of an element before added to the DOM
Elements don’t have a height, in any real sense, until they’ve been added to the DOM, as their styles cannot be evaluated until then. You can get around this easily enough using visibility: hidden so that the element can be added to the DOM (and its height determined) without causing visible flickering. function test(a) { … Read more
python append to array in json object
jsobj[“a”][“b”][“e”].append({“f”:var3, “g”:var4, “h”:var5}) jsobj[“a”][“b”][“e”].append({“f”:var6, “g”:var7, “h”:var8})
Remove and adding elements to array in GO lang
For the output array you need to use append or allocate it with an initial capacity to match the size of input. // before the loop output := make([]string, len(input)) would be my recommendation because append causes a bunch of needless reallocations and you already know what capacity you need since it’s based on the … Read more
How to save a hash into a CSV
If you want column headers and you have multiple hashes: require ‘csv’ hashes = [{‘a’ => ‘aaaa’, ‘b’ => ‘bbbb’}] column_names = hashes.first.keys s=CSV.generate do |csv| csv << column_names hashes.each do |x| csv << x.values end end File.write(‘the_file.csv’, s) (tested on Ruby 1.9.3-p429)