nested

I'm trying to perform tuple to list and list to tuple conversions on nested sequences of unknown depth and shape. The calls are being made hundreds of thousands of times, which is why I'm trying to squeeze out as much speed as possible. Any help is much appreciated. Here's what I have so far... def listify(self, seq, was, toBe): temp = [] a = temp.append for g in seq: if type(g) == was: a(self.listify(g, was, toBe)) else: a(g) return toBe(temp) And a call for tuple to list would look like this: self.listify((...), tuple, list) Edit: Yeah, I totally missed both the enumerate (from an old

I have some data stored in a table like so: id parent_id name 1 0 Entry 1 2 0 Entry 2 3 0 Entry 3 4 1 Child of entry 1 I want to turn it into a nested array like so: array( array( 'id' => 1, 'parent_id' => 0, 'name' => 'Entry 1', 'children' => array(...) ), ... ); Ideally, it would need to support an infinite amount of nesting (children with children). Is my table set up to support this, if so, how would I generate this kind of array using the data in the table? If not, how should I set up my table? There is a very good description of managing hierarchical data in mysql here: managing

I have a huge depth dictionary that represents forest (many non-binary trees) which I want to process the forest and create a text file with all possible relations of the forest, e.g. given the dictionary: {'a': {'b': {'c': {}, 'd': {}}, 'g': {}}} the generated text file will look like: a b c a b d a g Note that the nested dictionary is big and iterating over it recursively is makes a memory run-time error. What I tried doing is converting the dictionary into a list of lists recursively which yields a run-time error. The code: def return_list(forest): for ent in forest.keys(): lst = [new_ent]

We're looking to use CSS to create an ordered list that looks like this: A. A.1 A.2 B. C. C.1 C.2 C.2.1 C.2.2 How would you include the parent index in the child like this? Gabriele Petrioli You should use CSS counters W3C specs ( as @Zeta ) has pointed out, but here is an approach that will handle multiple nesting and latin counters .. ol{ list-style: none; } ol.roman{ counter-reset: roman; } ol.roman > li:before{ counter-increment: roman; content: counter(roman, upper-latin)"."; padding-right:5px; } ol.roman li ol{ counter-reset: inner; } ol.roman ol li:before{ counter-increment: inner;

In codeigniter 2.1 I'm trying to display channels by category. So if i have a category called Film, i should see a list of Channels within Film. I tried a nested foreach loop to accomplish this but can't seem to get it to work. My tables structure is something like this but more complicated: My model: <?php class Pages_model extends CI_Model { function get_channels_by_categ_tv() { $this->db->select('categories.category_name, channels.channel_name'); $this->db->from('type_categ'); $this->db->join('categories', 'categories.category_id = type_categ.category_id'); $this->db->join('channels',

I want to create a list of lists from a file that contains the following data: 101 Rahul 102 Julie 103 Helena 104 Kally CODE lis = [] with open("student_details.txt" , "r+") as f: for i in range(1,3,1): for data in f.read().split(): lis.append(data) print(lis) Output I Want [[101,Rahul] ,[102,Julie] ,[103,Helena] ,[104,Kally]] Output I m getting ['101', 'Rahul', '102', 'Julie', '103', 'Helena', '104', 'Kally'] Your code: lis = [] with open("student_details.txt" , "r+") as f: for i in range(1,3,1): for data in f.read().split(): lis.append(data) print(lis) Note the two for loops, what you are

I'm in the process of learning functional programming, and completely getting rid of for loops has been a challenge sometimes, because they provide so much control and freedom. Below is an example of checking if a string is an isogram or not (no letters should be repeated). With nested for loops, it became an easy solution. Is there a way to do this the functional way with any high order functions or anything else? Any suggestion would be a huge help. Code: function isIsogram(string) { let array = string.split(''); let condition = true; for (let i = 0; i < string.length; i++) { //first loop