tuples

问题 "Introduction to Caml" says Note, in Caml it is better to use Curried function definitions for multiple-argument functions, not tuples. when comparing 'a -> 'b -> 'c calling conventions to 'a * 'b -> 'c . When working with SML/NJ I got used to using tuple types for both input and output : ('a * 'b) -> ('c * 'd) so using tuples to express multiple inputs seems symmetric with the way I express multiple outputs. Why is currying recommended for OCaml function declarations over tuple arguments? Is

问题 Backstory I'm porting the QuickCheck unit test framework to C (see the working code at GitHub). The syntax will be: for_all(property, gen1, gen2, gen3 ...); Where property is a function to test, for example bool is_odd(int) . gen1 , gen2 , etc. are functions that generate input values for property . Some generate integers, some generate chars, some generate strings, and so on. for_all will accept a function with arbitrary inputs (any number of arguments, any types of arguments). for_all will

问题 I have the following code: var_one = var_two[var_three-1] var_one = "string_one" + var_1 And I need to do the following to it: var_four = 'string_two', var_one However, this returns the following error: TypeError: Can't convert 'tuple' object to str implicity I have tried things such as str(var_one) and using strip but these did not work. What can I do to achieve the result I require? EDIT - Here are what the variables contain: var_one: new variable var_two: tuple var_three: integer var_four:

问题 I'm trying to create a list of tuples from a list using LINQ, but can't work out how to do it. What I've got is various data in an external file, which I'm reading sections using a standard method into a List<Single> , I then need to turn this into lists of groups of sequential elements of this list (which may have a variable number of elements in the groups). To state it another way: List<Single> with n elements goes to List<Tuple<Single, Single>> with (n/2) elements or List<Single> with n

问题 I have pseudo-code like this: if( b < a) return (1,0)+foo(a-b,b) I want to write it in python. But can python add tuples? What is the best way to code something like that? 回答1: Do you want to do element-wise addition, or to append the tuples? By default python does (1,2)+(3,4) = (1,2,3,4) You could define your own as: def myadd(x,y): z = [] for i in range(len(x)): z.append(x[i]+y[i]) return tuple(z) Also, as @delnan's comment makes it clear, this is better written as def myadd(xs,ys): return

问题 In Python (2 and 3). Whenever we use list slicing it returns a new object, e.g.: l1 = [1,2,3,4] print(id(l1)) l2 = l1[:] print(id(l2)) Output >>> 140344378384464 >>> 140344378387272 If the same thing is repeated with tuple, the same object is returned, e.g.: t1 = (1,2,3,4) t2 = t1[:] print(id(t1)) print(id(t2)) Output >>> 140344379214896 >>> 140344379214896 It would be great if someone can shed some light on why this is happening, throughout my Python experience I was under the impression

问题 I have a list of tuples which are http headers. I want to convert the list to a JSON object. I try mochijson2 but to no avail. So I have the following : [{'Accept',"text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"}, {'Accept-Charset',"ISO-8859-1,utf-8;q=0.7,*;q=0.7"}, {'Accept-Encoding',"gzip,deflate"}, {'Accept-Language',"en-us,en;q=0.5"}, {'Cache-Control',"max-age=0"}, {'Connection',"close"}, {'Cookie',"uid=CsDbk0y1bKEzLAOzAwZUAg=="}, {'User-Agent',"Mozilla/5.0 (Macintosh; U

问题 Format of my file is - ({"food":"Tacos", "person":"Alice", "amount":3}) ({"food":"Tomato Soup", "person":"Sarah", "amount":2}) ({"food":"Grilled Cheese", "person":"Alex", "amount":5}) I tried to store this using the following code STORE STOCK_A INTO 'default.ash_json_pigtest' USING HCatStorer(); Stored data as shown below. {"food":"Tacos", "person":"Alice", "amount":3} None None {"food":"Tomato Soup", "person":"Sarah", "amount":2} None None {"food":"Grilled Cheese", "person":"Alex", "amount"

问题 I have a list of 10-tuples in Haskell and I want to get nth tuple from that list of tuples. But as I saw, only length function worked with that list. head , tail or !! functions didn't work. Can you tell me what should I do? The tuples are composed of integers and strings. For example when I try this : tail [(3,5,"String1","String2","String3","String4","String5","String6","String7","String8"),(3,5,"String1","String2","String3","String4","String5","String6","String7","String8"),(3,5,"String1",

问题 Hello I have a list as follows: ['2925729', 'Patrick did not shake our hands nor ask our names. He greeted us promptly and politely, but it seemed routine.']. My goal is a result as follows: ['2925729','Patrick did not shake our hands nor ask our names'], ['2925729', 'He greeted us promptly and politely, but it seemed routine.'] Any pointers would be very much appreciated. 回答1: >>> t = ['2925729', 'Patrick did not shake our hands nor ask our names. He greeted us promptly and politely, but it