tuples

pattern matching, tuples and multiplication in Python

由 两盒软妹~` 提交于 2019-12-08 01:28:40
问题 What is be best way to reduce this series of tuples ('x', 0.29, 'a') ('x', 0.04, 'a') ('x', 0.03, 'b') ('x', 0.02, 'b') ('x', 0.01, 'b') ('x', 0.20, 'c') ('x', 0.20, 'c') ('x', 0.10, 'c') into: ('x', 0.29 * 0.04 , 'a') ('x', 0.03 * 0.02 * 0.01, 'b') ('x', 0.20 * 0.20 * 0.10, 'c') EDIT: X is a constant, it is known in advance and can be safely ignored And the data can be treated as pre-sorted on the third element as it appears above. I am trying to do it at the moment using operator.mul, and a

How to check a specific type of tuple or list?

由 删除回忆录丶 提交于 2019-12-07 22:08:59
问题 Suppose, var = ('x', 3) How to check if a variable is a tuple with only two elements, first being a type str and the other a type int in python? Can we do this using only one check? I want to avoid this - if isinstance(var, tuple): if isinstance (var[0], str) and (var[1], int): return True return False 回答1: Here's a simple one-liner: isinstance(v, tuple) and list(map(type, v)) == [str, int] Try it out: >>> def check(v): return isinstance(v, tuple) and list(map(type, v)) == [str, int] ... >>>

How to apply implicit conversions between tuples?

由 喜欢而已 提交于 2019-12-07 21:47:30
I'm experimenting with currying/tupled as an alternative means to pass parameters to a function. In this journey, I'm facing some type difficulties. I'd like to use implicit conversions to transform a tuple of parameters to the target type. This is what I expect: Given (REPL example): case class Cont(value:String) // a simplified container class val paramTuple = (Cont("One"),Cont("2")) def operate(s:String, i:Int): String = s+i // my target operation implicit def contToString(c:Cont): String = c.value implicit def contToInt(c:Cont): Int = c.value.toInt //This works - obviously operate

What is the difference between a row, record and tuple? [closed]

由 社会主义新天地 提交于 2019-12-07 21:30:45
问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . I am studying in a database development course at the moment and I am having trouble getting my head this! My course notes describe a

Sort an array of tuples in swift 3

由 不问归期 提交于 2019-12-07 14:52:43
问题 Hi I have the following class MyClass { var myString: String? } var myClassList = [String: MyClass]() I would like to sort this array alphabetically by the myString variable in Swift 3 any pointers? 回答1: Cool problem! Though i'd like to point out first that [String: MyClass] is a Dictionary and not at Tupule. Swift does, however, support Tupules. The syntax for your tupule would look like so: var tupule: (String, MyClass) = (foo, bar) You would then need to make an Array of them: var tupules:

Converting each element of a list to tuple

由 萝らか妹 提交于 2019-12-07 14:42:36
问题 I to convert each element of list to tuple like following : l = ['abc','xyz','test'] convert to tuple list: newl = [('abc',),('xyz',),('test',)] Actually I have dict with keys like this so for searching purpose I need to have these. 回答1: You can use a list comprehension: >>> l = ['abc','xyz','test'] >>> [(x,) for x in l] [('abc',), ('xyz',), ('test',)] >>> Or, if you are on Python 2.x, you could just use zip: >>> # Python 2.x interpreter >>> l = ['abc','xyz','test'] >>> zip(l) [('abc',), (

Asp.net mvc 2 .net 4.0 error when View model type is Tuple with more than 4 items

由 北战南征 提交于 2019-12-07 14:16:23
问题 When I create strongly typed View in Asp.net mvc 2, .net 4.0 with model type Tuple I get error when Tuple have more than 4 items example 1: type of view is Tuple<string, string, string, string> (4-tuple) and everything works fine view: <%@ Page Title="" Language="C#" MasterPageFile="~/Views/Shared/WebUI.Master" Inherits="System.Web.Mvc.ViewPage<Tuple<string, string, string, string>>" %> controller: var tuple = Tuple.Create("a", "b", "c", "d"); return View(tuple); example 2: type of view is

python json dump writability “not write able”

由 独自空忆成欢 提交于 2019-12-07 13:55:29
So this is the second piece of a problem with my program, but a completely different issue, thanks to the helpful person who suggested JSON as a better method to do what I wanted.... Anyway... some success with JSON. The program also changed theme, I definitely am not tying to make a game, just get the inspiration to learn more about the concept of "saving" in python.. so here's my code so far, with a valid JSON coded file to read from.. but I ran into another snag, it reports this error when I try to use the JSON 's .dump method Error: Traceback (most recent call last): File "<string>", line

Use statement For to write in a Tuple

由 99封情书 提交于 2019-12-07 13:48:06
问题 I use this code to send midi sysEx. It s perfect for sending "fix" data but now i need to send data with different size. var midiPacket:MIDIPacket = MIDIPacket() midiPacket.length = 6 midiPacket.data.0 = data[0] midiPacket.data.1 = data[1] midiPacket.data.2 = data[2] midiPacket.data.3 = data[3] midiPacket.data.4 = data[4] midiPacket.data.5 = data[5] //... //MIDISend... Now imagine i have a String name "TROLL" but the name can change. I need something like this : var name:String = "TOTO" var

Pythonistic way to intersect and add elements of lists at the same time

由 南楼画角 提交于 2019-12-07 13:11:54
问题 I have 3 lists, a , b and c Each of this lists contains tuples with 3 numbers. Here is an example input: a = [(1,2,4),(1,7,8),(1,5,4),(3,6,7)] b = [(1,2,5),(1,9,3),(1,0,3),(3,6,8)] c = [(2,6,3),(2,4,9),(2,8,5),(1,2,7)] I'm looking for a way to generate a list that takes elements of those 3 lists if the two firsts items of eachs tuple are equals, and addind the third element. In the data I gave, there is only 1 set of tuple with the 2 first values equals : (1,2,4) , (1,2,5) and (1,2,7) . If I
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