Your list of tuples adds an extra layer. You have 3 layers of items: The outer list of length 1 million, so 1 million pointers 1 million 2-slot tuples, so 2 million pointers 2 million references to 1 million integer values while your dict only holds: The dict (including 1 million cached hashes) with 2 … Read more
The type of each element of a tuple can be different, so you can’t iterate over them. Tuples are not even guaranteed to store their data in the same order as the type definition, so they wouldn’t be good candidates for efficient iteration, even if you were to implement Iterator for them yourself. However, an … Read more
Both are product types which let you build types from multiple simpler types. Some languages treat tuples as a kind of record. Definitions A tuple is an ordered group of elements, like (10, 25). A record is typically a group of named elements like { “x”: 10, “y”: 25 } where the value has two … Read more
Like the error message suggests, dictionaries in Python do not provide an append operation. You can instead just assign new values to their respective keys in a dictionary. mydict = {} mydict[‘item’] = input_value If you’re wanting to append values as they’re entered you could instead use a list. mylist = [] mylist.append(input_value) Your line … Read more
It doesn’t work because named tuple names are not quite “real”, it’s mostly syntax sugar provided by compiler. If you look at ValueTuple set of types, by which named tuples are represented, you will see that they have properties like Item1, Item2 and so on. Compiler will rewrite all your references to named tuple names … Read more
In addition to Praetorian’s correct answer (which I’ve upvoted), I wanted to add a little more information… Post-C++14, the standard has been changed to allow: tuple<int, int> t2={1, 2}; to compile and have the expected semantics. The proposal that does this is N4387. This will also allow constructs such as: tuple<int, int> foo() { return … Read more
Don’t forget the () when you cast: Tuple<string, string> selectedTuple = (Tuple<string, string>)comboBox1.SelectedItem;
Cleaner Pythonic approach: >>> [(x,y) for x,y in zip(myList, myList[1:]) if y == 9] [(8, 9), (4, 9), (7, 9)] What is the code above doing: zip(some_list, some_list[1:]) would generate a list of pairs of adjacent elements. Now with that tuple, filter on the condition that the second element is equal to 9. You’re done … Read more
You use in. if element in thetuple: #whatever you want to do.
You’d have to ask the BCL designers to be certain, but I suspect that since there is a 1-tuples in the real world, the .NET framework authors wanted to provide equivalent symmetry in their implementation. Tuples are the .NET implementation of what you’d consider the mathematical concept of a tuple. Now since you’re asking for … Read more