tuples

问题 I know questions similar to this have been asked many, many times on Stack Overflow, but I need to remove duplicate tuples from a list, but not just if their elements match up, their elements have to be in the same order. In other words, (4,3,5) and (3,4,5) would both be present in the output, while if there were both (3,3,5) and (3,3,5) , only one would be in the output. Specifically, my code is: import itertools x = [1,1,1,2,2,2,3,3,3,4,4,5] y = [] for x in itertools.combinations(x,3): y

问题 I know questions similar to this have been asked many, many times on Stack Overflow, but I need to remove duplicate tuples from a list, but not just if their elements match up, their elements have to be in the same order. In other words, (4,3,5) and (3,4,5) would both be present in the output, while if there were both (3,3,5) and (3,3,5) , only one would be in the output. Specifically, my code is: import itertools x = [1,1,1,2,2,2,3,3,3,4,4,5] y = [] for x in itertools.combinations(x,3): y

问题 I was trying to use *args with a for loop in python, however I don't see how to return all the values passed to the function, which should return all the even numbers def f_even(*args): for item in args: if item%2 == 0: return item The above code returns only the first value, as I guess after the return it goes out of the function. Indeed, if I use print instead, it works I'm trying to find a way to return a tuple with all the even numbers when I pass let's say (1,2,3,4,5) to the function

问题 Apologize for my English first. I have a function like function func(): [string, string[]] which returns a Tuple. However, when I implement the return statement like var test = ['text', ['foo', 'bar']]; return test; Typescript inferred my return type as (string | string[])[] instead of [string, string[]] . Did I missed something or should I need to cast the return object as Tuple explicitly everytime like return <[string, string[]]>['text', ['foo', 'bar']] . If yes then isn't it quite

问题 Apologize for my English first. I have a function like function func(): [string, string[]] which returns a Tuple. However, when I implement the return statement like var test = ['text', ['foo', 'bar']]; return test; Typescript inferred my return type as (string | string[])[] instead of [string, string[]] . Did I missed something or should I need to cast the return object as Tuple explicitly everytime like return <[string, string[]]>['text', ['foo', 'bar']] . If yes then isn't it quite

问题 i am trying to return a value from db and getting this error.I tried the previously answered questions here,but no luck.Can anyone help me? @frappe.whitelist() def generate_barcode(): last_barcode = frappe.db.sql("""\ select MAX(barcode) from `tabItem` """) if last_barcode: last_barcode = last_barcode + 1 else: x = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0] random.shuffle(x) last_barcode = x[0] return {'last_barcode':last_barcode} adding traceback: Traceback (innermost last): File "/home/adminuser/frappe

问题 The line import re; print(re.findall("(.*) (.*)", "john smith")) outputs [("john", "smith")] , which can be unpacked like [(first_name, last_name)] = re.findall(...) . However, in the event of a non-match ( findall returning [] ) this unpacking throws ValueError: not enough values to unpack (expected 1, got 0) . What is the correct way to safely unpack this array of tuples, which would work in both match ( [("john", "smith")] ) and non-match ( [] ) scenarios? 回答1: The generic answer is to

问题 The line import re; print(re.findall("(.*) (.*)", "john smith")) outputs [("john", "smith")] , which can be unpacked like [(first_name, last_name)] = re.findall(...) . However, in the event of a non-match ( findall returning [] ) this unpacking throws ValueError: not enough values to unpack (expected 1, got 0) . What is the correct way to safely unpack this array of tuples, which would work in both match ( [("john", "smith")] ) and non-match ( [] ) scenarios? 回答1: The generic answer is to

问题 I have just included a DLL file into my project and am using a method which returns a List<Tuple> . I have only recently became aware of the ValueTuple datatype in C# 7 and want to use it instead of the normal Tuples which are returned. I am aware that I could loop through and do the conversion manually however I would like to avoid doing this if possible and was wondering if anyone was aware of a shorthand way to casting a Tuple to a ValueTuple? If I am being ignorant and this isn't possible

问题 In visual studio 2017, after turning on /std:c++17 , I can do auto [d1, d2] = func_return_tuple(); , where func_return_tuple() returns a tuple of two double value. However, if class A has two member variable d1_ and d2_ , I can't do A a; auto [a.d1_, a.d2_] = func_return_tuple(); Is there a way out? Of course, std::tie(a.d1_, a.d2_) = func_return_tuple(); always works. 回答1: Is there a way out? Basically, no. Structured bindings is only about decomposing an object into constituent elements. It