nested-lists

How can I create a nested list of categories in Laravel? I want to create something like this: --- Php ------ Laravel --------- Version ------------ V 5.7 --- Python ------ Django --- Ruby .......... My table's fields are: id | name | parent_id If I have to add another column like depth, please tell me. I am using this following code, but I think it is not the best solution for creating nested-list of categories besides, I can not pass this function to my view. function rec($id) { $model = Category::find($id); foreach ($model->children as $chield) rec($chield->id); return $model->all(); }

I have a nested list, something like this: List<Hotel> Hotels; public class Hotel { List<RoomType> RoomType; } public class RoomType { Room Room; } public class Room { int RoomId; } It's a little convoluted, sorry couldn't think of a better mockup model. The Idea is that I have many hotels, each hotels has many room types, and assume each room type has exactly one room object. Now from Hotels list, I just want to select all RoomId 's.. I am stuck here, while trying to nest all list.. right now, I am trying this: //cant do this some invalid error int[] AllRoomIds = Hotels.selectMany(x => x

I have a list of lists: a = [[1, 3, 4], [2, 5, 7]] I want the output in the following format: 1 3 4 2 5 7 I have tried it the following way , but the outputs are not in the desired way: for i in a: for j in i: print(j, sep=' ') Outputs: 1 3 4 2 5 7 While changing the print call to use end instead: for i in a: for j in i: print(j, end = ' ') Outputs: 1 3 4 2 5 7 Any ideas? Iterate through every sub-list in your original list and unpack it in the print call with * : a = [[1, 3, 4], [2, 5, 7]] for s in a: print(*s) The separation is by default set to ' ' so there's no need to explicitly provide

I'm using a nested list to look up values in a dictionary I created. I then want to append the values found to a list. The problem I don't know how to code is how to I keep the values appended within the same nested list structure? Here's the code where the last line I'm appending the values to an empty list. #Creating a dictionary of FID: LU_Codes from external txt file import sys, arcpy, string, csv text_file = open("H:\SWAT\NC\FID_Whole.txt", "r") Lines = text_file.readlines() text_file.close() FID_LU = map(string.split, Lines) #print FID_LU FID_GC_dict = dict(FID_LU) Neighbors_file = open(

i searched for a solution to remove deplicates from two 2d list in python i couldn't find so here my question: i have two lists, for example [[1,2],[3,5],[4,4],[5,7]] [[1,3],[4,4],[3,5],[3,5],[5,6]] Expected result: [[1,2],[1,3],[5,7],[5,6]] I want to remove list inside on the lists that match EXACTLY the values of the other list. my script: def filter2dim(firstarray, secondarray): unique = [] for i in range(len(firstarray)): temp=firstarray[i] for j in range(len(secondarray)): if(temp == secondarray[j]): break elif(j==(len(secondarray)-1)): unique.append(temp) for i in range(len(secondarray))