sorting

问题 I have some elements in a list in one class. I want them sorted in a new list, and they have to be sorted by an attribute from another class. Can anyone give an example? My code so far looks like this: class Carcompany: def __init__(self, model, production_number): self.model = model self.production_number = production_number self.car_list = [] def add_car_to_car_list(self, car): self.car_list.append(car) class Info: def __init__(self): self.license_plate_number = [] def add_license_plate_to

问题 I have some elements in a list in one class. I want them sorted in a new list, and they have to be sorted by an attribute from another class. Can anyone give an example? My code so far looks like this: class Carcompany: def __init__(self, model, production_number): self.model = model self.production_number = production_number self.car_list = [] def add_car_to_car_list(self, car): self.car_list.append(car) class Info: def __init__(self): self.license_plate_number = [] def add_license_plate_to

问题 I have an array which looks like this: $arr = ( [0]=>Int(2) [1]=>Array( ....) [2]=>Array( ....) [3]=>Array( ....)) I have used usort to sort it: usort($arr,function($a, $b) { if($a['prop'] == $b['prop']) return 0; return ($a['prop'] < $b['prop']) ? 1 : -1; }); My problem is that the key [0] is rewritten with an Array element. Don't get me wrong...it's suppose to. How could i sort the $arr array without rewrite the key [0] ? 回答1: just use uasort() http://php.net/manual/en/function.uasort.php

问题 Given the following array: y = %w[A1 A2 B5 B12 A6 A8 B10 B3 B4 B8] => ["A1", "A2", "B5", "B12", "A6", "A8", "B10", "B3", "B4", "B8"] With the expected sorted array to be: => ["A1", "A2", "A6", "A8", "B3", "B4", "B5", "B8", "B10", "B12"] Using the following (vanilla) sort, I get: irb(main):2557:0> y.sort{|a,b| puts "%s <=> %s = %s\n" % [a, b, a <=> b]; a <=> b} A1 <=> A8 = -1 A8 <=> B8 = -1 A2 <=> A8 = -1 B5 <=> A8 = 1 B4 <=> A8 = 1 B3 <=> A8 = 1 B10 <=> A8 = 1 B12 <=> A8 = 1 A6 <=> A8 = -1 A1

问题 Given the following array: y = %w[A1 A2 B5 B12 A6 A8 B10 B3 B4 B8] => ["A1", "A2", "B5", "B12", "A6", "A8", "B10", "B3", "B4", "B8"] With the expected sorted array to be: => ["A1", "A2", "A6", "A8", "B3", "B4", "B5", "B8", "B10", "B12"] Using the following (vanilla) sort, I get: irb(main):2557:0> y.sort{|a,b| puts "%s <=> %s = %s\n" % [a, b, a <=> b]; a <=> b} A1 <=> A8 = -1 A8 <=> B8 = -1 A2 <=> A8 = -1 B5 <=> A8 = 1 B4 <=> A8 = 1 B3 <=> A8 = 1 B10 <=> A8 = 1 B12 <=> A8 = 1 A6 <=> A8 = -1 A1

问题 This question already has answers here : Sorting an ArrayList of objects using a custom sorting order (10 answers) Closed 5 months ago . I wish to sort my objects in order of their Email address. This is the method I've attempted but it does not work, but I'm not even sure it's the correct way to do what I want? public static ArrayList<Billing> sortedListByEmail(ArrayList<Billing> Billing) { ArrayList<Billing> Sort = new ArrayList<Billing>(); for (int i = 0; i < Sort.size(); i++) {

问题 Is there a more Pythonic, compact, intuitive way to sort letter-grades than this (without using a custom dict)? grades = ['B-','C','B','C+','A','D+','B+','C-','A+','D','A-'] sorted(grades, key=lambda g: (g[0], '+ -'.index((g+' ')[1])) ) ['A+', 'A', 'A-', 'B+', 'B', 'B-', 'C+', 'C', 'C-', 'D+', 'D'] In order to get the comparative numerical order of 'X-','X','X+', I do a hacky append of a space ' ' so that g[1] always exists, so then I can use .index() to get the rank of the modifier '+ -'.

问题 I'm trying to transform this xml. However I'm having formatting issues. Could someone please guide me to solve this problem. Thanks in advance <?xml version="1.0" encoding="windows-1252"?> <XML> <Attributes> <Attribute> <id>5</id> <Name>Buyer ID</Name> <Type>common</Type> <Value>Lee</Value> </Attribute> <Attribute> <id>331</id> <Name>Enviornment</Name> <Type>common</Type> <Value>Development</Value> </Attribute> <Attribute> <id>79</id> <Name>Retail</Name> <Type>common</Type> <Value></Value> <

问题 Doing a college project and I'm a bit stuck.. Basically, I need to take the string input for an employee name and an integer input for the amount of properties they sold. I then need to print these values in descending order based on the number of properties sold, so, for example, I need to print something like this: (Bolded to make it easier to read) Name : John Properties Sold : 5 Name : Peter Properties Sold : 4 Name : Craig Properties Sold : 3 I have stored the name and properties sold in

问题 I have a table consisting basically of the following: myTable = {{1, 6.345}, {2, 3.678}, {3, 4.890}} and I'd like to sort the table by the decimal values. So I'd like to the output to be: {{2, 3.678}, {3, 4.890}, {1, 6.345}} If possible, I'd like to use the table.sort() function. Thankyou in advance for the help :-) 回答1: Given that your table is a sequence, you can use table.sort directly. This function accepts a comparison predicate as its second argument, which prescribes the comparison