sorting

问题 How can I modify this list so that all p's appear at the beginning, the q's at the end, and the values in between are sorted alphabetically? l = ['f','g','p','a','p','c','b','q','z','n','d','t','q'] So I would like to have: ['p','p','a','b','c','d','f','g','n','t','z','q','q'] 回答1: You can use sorted with the following key : sorted(l, key = lambda s: (s!='p', s=='q', s)) ['p', 'p', 'a', 'b', 'c', 'd', 'f', 'g', 'n', 't', 'z', 'q', 'q'] Explanation To get a better idea of how this is working,

问题 What is the fasted way to get a sorted, unique list in python? (I have a list of hashable things, and want to have something I can iterate over - doesn't matter whether the list is modified in place, or I get a new list, or an iterable. In my concrete use case, I'm doing this with a throwaway list, so in place would be more memory efficient.) I've seen solutions like input = [5, 4, 2, 8, 4, 2, 1] sorted(set(input)) but it seems to me that first checking for uniqueness and then sorting is

问题 What is the fasted way to get a sorted, unique list in python? (I have a list of hashable things, and want to have something I can iterate over - doesn't matter whether the list is modified in place, or I get a new list, or an iterable. In my concrete use case, I'm doing this with a throwaway list, so in place would be more memory efficient.) I've seen solutions like input = [5, 4, 2, 8, 4, 2, 1] sorted(set(input)) but it seems to me that first checking for uniqueness and then sorting is

问题 I have an NSArray of NSDictionary let Array = ( { name = "Auni"; age = "24"; transactionTime = "01-02-2011 12:32:39" }, { name = "Atiqah"; age = "23"; transactionTime = "02-02-2013 10:32:41" }, { name = "Aida"; age = "22"; transactionTime = "04-02-2020 18:32:21"}) How do I sort this array by most recent transactionTime ? Using Swift4. Thank you. Edit: It's easier to have back-end people do it for you. 回答1: You do not need to convert into Date object, dateStrings direct comparison will also

问题 I am getting three different substrings from file ID's,company name and date while retrieving i need to store sorted by date values into object. I have retrieved and converted string to date format that i need and stored. instead of pulling again every time using sql sorting, trying to store sorted by dates before inserting. class ReadingFile { public static String input_path = ("C:\\Users\\RAVI\\Desktop\\Skills\\inputs"); public static String output_path = ("C:\\Users\\RAVI\\Desktop\\Skills\

问题 I am getting three different substrings from file ID's,company name and date while retrieving i need to store sorted by date values into object. I have retrieved and converted string to date format that i need and stored. instead of pulling again every time using sql sorting, trying to store sorted by dates before inserting. class ReadingFile { public static String input_path = ("C:\\Users\\RAVI\\Desktop\\Skills\\inputs"); public static String output_path = ("C:\\Users\\RAVI\\Desktop\\Skills\

问题 I need to sort a list of tuples in Python by a specific tuple element, let's say it's the second element in this case. I tried sorted(tupList, key = lambda tup: tup[1]) I have also tried sorted(tupList, key = itemgetter(1)) '''i imported itemgetter, attrgetter, methodcaller from operator''' but the list was returned the same both times. I checked sorting tuples in python with a custom key sort tuples in lists in python https://wiki.python.org/moin/HowTo/Sorting 回答1: I'm guessing you're

问题 I'm sorting array: myArray.sort(comparators.some_comparator); and I have several comparator to choose from: comparators = { asc_firstname_comparator : function(o1, o2){ ... } desc_firstname_comparator : function(o1, o2){ ... } etc... } I want to write function which returns certain comparator depending on input data. It should figure out comparator from string inputs, something like this: function chooseComparator(field, order){ return "comparators."+order+"_"+field+"_comparator"; } So is it

问题 ActiveSheet.Range("a1:b1").AutoFilter the above code works fine but sometimes gives error 'autofilter method of range class failed'. my intention is to enable filtering for some columns without any criteria. is there any better way? 回答1: As a rule I always turn off all prior filters, just in case. ActiveSheet.AutoFilterMode = False 'turn off prior filters ActiveSheet.Range("A1:B1").AutoFilter 'turn on new clean filter 来源： https://stackoverflow.com/questions/14827833/autofilter-method-of-range

问题 I have a program with 2 "paired" integer arrays newNumerator[ ], and newDenominator[ ] which both have 9 integers in them. I wrote a function that sorts them in ascending order, however I'm not sure it works as I have not gotten it to successfully compile yet. I am having some issues with typecasting too. Here is the function definition- void sortData(int *newNumerator[], int *newDenominator[], int newSize) { int temp1; int temp2; bool swap; int count = 0; double percentageLeft = 100.0 *