sorting

问题 I am trying to sort a list by frequency of its elements. >>> a = [5, 5, 4, 4, 4, 1, 2, 2] >>> a.sort(key = a.count) >>> a [5, 5, 4, 4, 4, 1, 2, 2] a is unchanged. However: >>> sorted(a, key = a.count) [1, 5, 5, 2, 2, 4, 4, 4] Why does this method not work for .sort() ? 回答1: What you see is the result of a certain CPython implementation detail of list.sort . Try this again, but create a copy of a first: a.sort(key=a.copy().count) a # [1, 5, 5, 2, 2, 4, 4, 4] .sort modifies a internally, so a

问题 I am trying to sort a list by frequency of its elements. >>> a = [5, 5, 4, 4, 4, 1, 2, 2] >>> a.sort(key = a.count) >>> a [5, 5, 4, 4, 4, 1, 2, 2] a is unchanged. However: >>> sorted(a, key = a.count) [1, 5, 5, 2, 2, 4, 4, 4] Why does this method not work for .sort() ? 回答1: What you see is the result of a certain CPython implementation detail of list.sort . Try this again, but create a copy of a first: a.sort(key=a.copy().count) a # [1, 5, 5, 2, 2, 4, 4, 4] .sort modifies a internally, so a

问题 I have text files containing many strings, one per line, that need to be sorted. I am trying to use the sort command however it can only sort in alphabetic or numeric order, and I need something more specific. Is it possible to use an external program to determine the ordering of items, something like sort --input=text.txt --evaluate=/bin/program ? 回答1: It is not supported by sort , or any sorting software that I know of. It's not practically feasible because it is too resource intensive to

问题 I am having an issue sorting through posts by date in safari. All works as expected in Chrome. First I fetch all the posts from my API. I then fetch some posts from the facebook api. These get combined together in an array. If I post a new post, it publishes it to facebook and sends back the post to display on my website. In chrome it automatically sorts this by date and is added in the right spot. In safari, all the new facebook posts get added to the end of the array - unsorted by date.

问题 I am having an issue sorting through posts by date in safari. All works as expected in Chrome. First I fetch all the posts from my API. I then fetch some posts from the facebook api. These get combined together in an array. If I post a new post, it publishes it to facebook and sends back the post to display on my website. In chrome it automatically sorts this by date and is added in the right spot. In safari, all the new facebook posts get added to the end of the array - unsorted by date.

问题 I am new in swift and I am working with firebase. I am getting the data but not in the correct order. I want to sort it into ascending order. My code is like this func getBuzz(){ db.collection("tablename").getDocuments { (querySnapshot, err) in if let err = err { print("Error getting documents: \(err)") } else { guard let docs = querySnapshot?.documents else { return } print(docs) for document in docs { self.arrdescriptionbuzz.append(document["description"] as Any) self.arrimagebuzz.append

问题 I'm trying to learn some stuff with Node.js + Express as a web server, trying to make it asynchronous. I've created an app to test time complexity of sorting algorithms (college homework inspiration), but it is not working asynchronously as I was intending. Any other REST call to the Express server is blocked until the former sorting code finishes running. I'm also using 'express-namespace-routes' to have some namespaces, so that it looks like an API call. This is my class Sort: class Sort {

问题 Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 7 days ago . On a follow up to my question. I am trying to sort my array in different ways. I first wanted to add the missing values in my array of objects and then wanted to be able to sort it. Since my data is dynamic, I created a function and then called it based on how I wanted it sorted. I

问题 Closed. This question is not reproducible or was caused by typos. It is not currently accepting answers. Want to improve this question? Update the question so it's on-topic for Stack Overflow. Closed 7 days ago . On a follow up to my question. I am trying to sort my array in different ways. I first wanted to add the missing values in my array of objects and then wanted to be able to sort it. Since my data is dynamic, I created a function and then called it based on how I wanted it sorted. I

问题 Problem Link to the problem: https://www.codewars.com/kata/52597aa56021e91c93000cb0/train/python Write an algorithm that takes an array and moves all of the zeros to the end, preserving the order of the other elements. move_zeros([false,1,0,1,2,0,1,3,"a"]) # returns[false,1,1,2,1,3,"a",0,0] My code: def move_zeros(array): list = [] list2 = [] for n in array: if n is 0: list2.append(n) else: list.append(n) return list + list2 Sample Tests: Test.describe("Basic tests") Test.assert_equals(move