append

Append item to a specified list in a list of lists (Python) [duplicate]

由 心不动则不痛 提交于 2019-12-21 05:25:10
问题 This question already has answers here : List of lists changes reflected across sublists unexpectedly (13 answers) Closed 6 years ago . I'm practicing my progamming skills by solving problems from project euler at the moment, and now I've come across some (in my opinion) strange behavior on Python. When I do: list = [[1]]*20 I get a list of 20 lists containing element 1, as expected. However, when I would like to append a 2 to the third element from this list, I would do that as follows: list

springboot 常用工具（IOUtils、FileUtils）

由 浪子不回头ぞ 提交于 2019-12-21 04:28:28
springboot 常用工具（IOUtils、FileUtils） **************************** 相关类 IOUtils：输入输出流操作 public class IOUtils { ********************* 静态方法 **************** 使用缓冲读取数据 public static InputStream toBufferedInputStream(InputStream input) throws IOException { public static InputStream toBufferedInputStream(InputStream input, int size) throws IOException { public static BufferedInputStream buffer(InputStream inputStream) { public static BufferedInputStream buffer(InputStream inputStream, int size) { public static BufferedReader toBufferedReader(Reader reader) { public static BufferedReader toBufferedReader

How can I store HashMap<String, ArrayList<String>> inside a list?

由 时光总嘲笑我的痴心妄想 提交于 2019-12-20 17:52:35
问题 My hashmap stores the string as key and arraylist as the values. Now, I need to embed this into a list. That is, it will be of the following form: List<HashMap<String, ArrayList<String>>> These are the declarations I have used: Map<String, ArrayList<String>> map = new HashMap<String, ArrayList<String>>(); ArrayList<String> arraylist = new ArrayList<String>(); map.put(key,arraylist); List<String> list = new ArrayList<String>(); Can anyone help me which method and how to use in the list to

NSMutableArray - Add array at start

由 China☆狼群 提交于 2019-12-20 12:36:00
问题 It is a simple pull to refresh case. I have data loaded into table and have a mutable data array at back-end, I receive a array of new data and want to add this complete array at start of existing array. One workaround is to create new array with new arrived data and then add previous array into it using addObjectsFromArray: method. Is there some workaround to add new data array to the start of previous array directly? 回答1: First, build an NSIndexSet . NSIndexSet *indexes = [NSIndexSet

To append a match efficiently in Vim :g/---/s/---/X/

由 ℡╲_俬逩灬. 提交于 2019-12-20 12:31:47
问题 How can you refer to the match in the command g in Vim? I would like to put X after the match without replacing the match. For instance, in the following command without writing the create_title twice. :g/create_title/s/create_title/X/ You should get create_titleX by running the command to create_tile 回答1: I'm not sure why you need the g portion of the command - the substitute will only act on matching lines. Here's what you're looking for: :%s/create_title/&X/ The & represents the entire

How merge two objects array in angularjs?

由 本小妞迷上赌 提交于 2019-12-20 10:33:52
问题 I want to append following object array with existing one in angulajs for implementing load more feature. ie,appending AJAX response with existing one each time. I have one variable, $scope.actions which contains following JSON data, { "total": 13, "per_page": 2, "current_page": 1, "last_page": 7, "next_page_url": "http://invoice.local/activities/?page=2", "prev_page_url": null, "from": 1, "to": 2, "data": [ { "id": 2108, "action_type_id": 202, "user_id": 1 }, { "id": 2108, "action_type_id":

ValueError: all the input arrays must have same number of dimensions

由 对着背影说爱祢 提交于 2019-12-20 09:54:18
问题 I'm having a problem with np.append . I'm trying to duplicate the last column of 20x361 matrix n_list_converted by using the code below: n_last = [] n_last = n_list_converted[:, -1] n_lists = np.append(n_list_converted, n_last, axis=1) But I get error: ValueError: all the input arrays must have same number of dimensions However, I've checked the matrix dimensions by doing print(n_last.shape, type(n_last), n_list_converted.shape, type(n_list_converted)) and I get (20L,) (20L, 361L) so the

Scala: what is the best way to append an element to an Array?

由 邮差的信 提交于 2019-12-20 08:22:58
问题 Say I have an Array[Int] like val array = Array( 1, 2, 3 ) Now I would like to append an element to the array, say the value 4 , as in the following example: val array2 = array + 4 // will not compile I can of course use System.arraycopy() and do this on my own, but there must be a Scala library function for this, which I simply could not find. Thanks for any pointers! Notes: I am aware that I can append another Array of elements, like in the following line, but that seems too round-about:

Scala: what is the best way to append an element to an Array?

由 ╄→гoц情女王★ 提交于 2019-12-20 08:22:22
问题 Say I have an Array[Int] like val array = Array( 1, 2, 3 ) Now I would like to append an element to the array, say the value 4 , as in the following example: val array2 = array + 4 // will not compile I can of course use System.arraycopy() and do this on my own, but there must be a Scala library function for this, which I simply could not find. Thanks for any pointers! Notes: I am aware that I can append another Array of elements, like in the following line, but that seems too round-about:

Python Append to a list returns none [duplicate]

由 眉间皱痕 提交于 2019-12-20 07:39:40
问题 This question already has answers here : Why does append() always return None in Python? [duplicate] (4 answers) Closed 4 years ago . I know different versions of this question has been answered for example [here].1 But I just couldn't seem to get it working on my example. I am trying to make a copy of ListA called ListB and then add an additional item to ListB i.e. 'New_Field_Name' in which later on I use as column headers for a dataframe. Here is my code: ListA = ['BUSINESSUNIT_NAME' ,
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