Other than doing list comprehensions of reversed list comprehension, is there a pythonic way to sort Counter by value? If so, it is faster than this: >>> from collections import Counter >>> x = Counter({‘a’:5, ‘b’:3, ‘c’:7}) >>> sorted(x) [‘a’, ‘b’, ‘c’] >>> sorted(x.items()) [(‘a’, 5), (‘b’, 3), (‘c’, 7)] >>> [(l,k) for k,l in … Read more
I have a list with some identifiers like this: List<long> docIds = new List<long>() { 6, 1, 4, 7, 2 }; Morover, I have another list of <T> items, which are represented by the ids described above. List<T> docs = GetDocsFromDb(…) I need to keep the same order in both collections, so that the items … Read more
Let’s say you’ve got an airplane, and it is low on fuel. Unless the plane drops 3000 pounds of passenger weight, it will not be able to reach the next airport. To save the maximum number of lives, we would like to throw the heaviest people off of the plane first. And oh yeah, there … Read more
This question already has answers here: How can I sort arrays and data in PHP? (13 answers) Closed 7 years ago. I have CSV data loaded into a multidimensional array. In this way each “row” is a record and each “column” contains the same type of data. I am using the function below to load … Read more
General question: What’s the proper way to reverse a stream? Assuming that we don’t know what type of elements that stream consists of, what’s the generic way to reverse any stream? Specific question: IntStream provides range method to generate Integers in specific range IntStream.range(-range, 0), now that I want to reverse it switching range from … Read more
I am a bit confused regarding data structure in python; (),[], and {}. I am trying to sort a simple list, probably since I cannot identify the type of data I am failing to sort it. My list is simple: [‘Stem’, ‘constitute’, ‘Sedge’, ‘Eflux’, ‘Whim’, ‘Intrigue’] My question is what type of data this is, … Read more
I have a pandas dataframe. I want to print the unique values of one of its columns in ascending order. This is how I am doing it: import pandas as pd df = pd.DataFrame({‘A’:[1,1,3,2,6,2,8]}) a = df[‘A’].unique() print a.sort() The problem is that I am getting a None for the output. 8 Answers 8
This is a long text. Please bear with me. Boiled down, the question is: Is there a workable in-place radix sort algorithm? Preliminary I’ve got a huge number of small fixed-length strings that only use the letters “A”, “C”, “G” and “T” (yes, you’ve guessed it: DNA) that I want to sort. At the moment, … Read more
Does a Java Set retain order? A method is returning a Set to me and supposedly the data is ordered but iterating over the Set, the data is unordered. Is there a better way to manage this? Does the method need to be changed to return something other than a Set? 13 Answers 13
I have array of objects person (int age; String name;). How can I sort this array alphabetically by name and then by age? Which algorithm would you use for this ? 15 Answers 15
