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# Returning a list in this recursive coi function in python

By : Oleg Solovyov
Date : November 21 2020, 07:01 PM
Hope this helps You're not returning the value of the recursive calls to makeChange2.
Once control reaches either of those calls to makeChange2 and completes the call, the program continues to the next statement, which is the end of the function; thus, it returns None.
code :

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## Ocaml returning a list from a recursive function

By : GavinZZZ
Date : March 29 2020, 07:55 AM
hop of those help? You refer to 'l' in get_elements, but it's not in the scope of that function.
Here's an approach using a ref to an integer list (a mutable list):
code :
`````` boolarray = [|true; false; true; false; false; true|] ;;
type ilist = (int list) ref ;;
let intlist () : ilist = ref [] ;;
let push ( l: ilist) (x: int) : unit = l := x::(!l) ;;
let lst = intlist () ;;
Array.iteri ( fun i b -> if b = true then (push lst i )) boolarray ;;
!lst ;; (* => int list = [5; 2; 0] *)
``````
``````let get_true_list (b: bool array) : int list =
let rec aux i lst  =
if (i = Array.length b)  then lst else
(if b.(i) = true then ( aux (i+1) (i::lst)) else (aux (i+1) lst))  in
aux 0 [] ;;
(* using boolarray defined above *)
get_true_list boolarray ;; (* => int list = [5; 2; 0] *)
``````

## How to convert recursive procedure with side effects on ref param to recursive function returning a list?

By : gpark
Date : March 29 2020, 07:55 AM
will help you It seems every time I go to write a recursive function I end up making it return void and using a ref parameter. , I guess something like:
code :
``````public static List<XDocument> GetResources(string startURL)
{
var result = new List<XDocument>();
var doc = XDocument.Parse(GetXml(startURL));
var xs = new XmlSerializer(typeof(resourceList));
if (xs.CanDeserialize(rdr))
{

foreach (var item in rl.resourceURL)
{
}
}
else
{
}
return result;
}
``````

## Recursive function returning none in Python

By : Harunkhan Bihari
Date : March 29 2020, 07:55 AM
help you fix your problem I have this piece of code, for some reason when I try to return the path, I get None instead: , You need to return the recursive result:
code :
``````else:
return get_path(directory[filename], rqfile, path)
``````
``````for filename in dictionary.keys():
path = prefix+[filename]
if not isinstance(dictionary[filename], dict):

if rqfile in str(os.path.join(*path)):
return str(os.path.join(*path))

return get_path(directory[filename], rqfile, path)
``````

## Returning a list from a recursive function

By : Eugene Guinn
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further First of all, you need to create the permutations list somewhere: Permutations = new List();.
Second, if you'd prefer to have the method return the list instead of defining a public property, you could do it like this:

## python returning a list from a recursive method

By : Ryan Begen
Date : March 29 2020, 07:55 AM
help you fix your problem Are you sure you want tree.self.key and not simply tree.key when you print?
Otherwise, a solution with yield from (Python 3.3+):