Operator priority for sum and division on the list in Scala

My example uses sum function but this is not the only higher order function I've been having problems with. To the point It's been a while but I keep catching myself on writing code like: scala> List(2, 5, 7, 11) sum / 3 which gives me: <console>

list [-1:] returns the last value, but is not == last value?

I'm still very new to coding, as in I've been coding for a few days. I'm trying to teach myself python by working on a small personal project. I've been playing around with list slicing, and something doesn't add up to me, which is impeding a functio

A loop to add a list item without high memory performance?

Everybody, a =[0, 0, 2, 4, 6] x=5 This a list (a) and a fix value (x). I need a loop codes which must add with x every element of list and add this value with previous list elements in every loop ( loop must continue as x value). Other words result s

PyCharm does not recognize the value type of the dictionary

I have a simple code snippet where I set dictionary values as empty lists: new_dict = {} for i in range(1, 13): new_dict[i] = [] Now, if inside the loop on the next line I would type new_dict[i] and add a dot, I expect PyCharm to show me a list of me

How to modify the elements of a list in the list

I am very new to Python, trying to learn the basics. Have a doubt about the list. Have a list: L = [[1,2,3],[4,5,6],[3,4,6]] The output should be: [[2,4,6],[8,10,12],[6,8,12]] The code that works for me is the following for x in range(len(L)): for y

Ensure List's ability

I was browsing about how to create own list and landed on this site http://www.vogella.com/tutorials/JavaDatastructureList/article.html where they had the below method. private void ensureCapa() { int newSize = elements.length * 2; elements = Arrays.

Reading a file contains lists of values ​​in a table

I have a big text file which is an output of some codes and it contains lists of numbers. The format of the lists in the file is as following [ 11.42102518 3.3538624 231.82137052 352.12777653] [ 12.68274035 2.84982539 292.99135783 331.74058558] [ 11.

how to divide a list into different python strings

i have a list object like this value = [<employee 'Mark Twain' as 'Captain'>,<employee 'Huckle' as 'Cowboy'>] now i would like to have the employee and in a seperate variable like emplo[0] and as[0] like emplo[0] = 'Mark Twain' as[0] = 'Captai

How to combine two lists of lists with a new list

This question already has an answer here: Get the cartesian product of a series of lists? 10 answers I have a problem like this. I have two lists, A and B, where A=[[1,2],[3,4],[5,6]] and B=[["a","b"],["c","d"]], I

How to convert a 2x2 card into a list of lists?

Python How do I turn a grid of: x,x x,x to a list of lists?: [['x', 'x'], ['x', 'x']] It's as simple as: with open(...) as f: list_of_lists = [line.strip().split(",") for line in f] # use list_of_lists

How to use a previously generated tuple to generate a new tuple

I was wondering if someone could help me figure out how to generate a new tuple with a previously generated tuple. What I have so far is just generating an empty tuple import math as m grav = 9.807 #[m/s**2] gravity http://physics.nist.gov/cgi-bin/cu

Filter a list of haskell

This is the code i have: data Review = Review { artiest :: String, score :: Integer, tour :: Tour, datum :: String, plaats :: String, soortLocatie :: Locatie, topSongs :: [String] } deriving (Eq, Ord, Show) getBestLoc [] beste = beste getBestLoc (x:x

Group a list by word length

For example, I have a list, say list = ['sight', 'first', 'love', 'was', 'at', 'It'] I want to group this list by word length, say newlist = [['sight', 'first'],['love'], ['was'], ['at', 'It']] Please help me on it. Appreciation!You can use a temp di

Create a Spotify playlist from the album list

I have a long-running list of favorite albums. I know sites like www.spotmysongs.com will take a text file of a list of artists and song titles and create a playlist out of them on Spotify, but I'd like to do the same with a list of albums, without t

List identified with another, using new elements in the loop

This question already has an answer here: python list by value not by reference 11 answers I have a list named MyList. I want to copy the list to a new one, then add items to the new one, so I do: MySecondList=MyList for item in MyList: if item==2: M

Processing a list of lists in Python

So I have a biiiiig list of lists, looks like: big_list = [[17465, [22, 33, 1, 7, 83, 54, 84, -5], '123-432-3'], [13254, [42, 64, 4, -5, 75, -2, 1, 6], '1423-1762-4'], [.................................................................................

Add a node to a C-linked list stack

So I've got this code already: http://pastebin.com/3wuFNWGA And I've got these typedefs in a .h file: http://pastebin.com/JTG9XHvW I need my push function to add a node to my_stack by allocating memory for the node, storing the data (new element) in

Convert a loop and an if statement to a list of comprehension

Is it possible to convert the following to a python list comprehension: values = [a,b,c,d,...] converted_values = [] for item in values: if type(item) == datetime.date: converted_values.append(item) else: converted_values.append(item.decode('utf-8'))

Why is tuple faster than the list?

I've just read in "Dive into Python" that "tuples are faster than lists". Tuple is immutable, and list is mutable, but I don't quite understand why tuple is faster. Anyone did a performance test on this?The reported "speed of cons

How to sort a list & lt; T & gt; by a property in the object

I have a class called Order which has properties such as OrderId, OrderDate, Quantity, and Total. I have a list of this Order class: List<Order> objListOrder = new List<Order>(); GetOrderList(objListOrder); // fill list of orders Now I want to

C # - Drop a list in a drop-down list

List<String> nameList = new List<String>(); DropDownList ddl = new DropDownList(); List is populated here, then sorted: nameList.Sort(); Now I need to drop it into the dropdownlist, which is where I'm having issues (using foreach): foreach (st