add solution without recursion

forest.py

@@ -12,7 +12,7 @@
 Пример:
 """
 import json
-from typing import Any, List, Tuple
+from typing import Any, List, Tuple, Union, Dict
 
 forest = {'b': 1,
           'c': {'d': 2,
@@ -30,11 +30,22 @@ forest = {'b': 1,
                             },
                       },
                 },
+          'a': 11,
+          'u': {'w': {'z': {'y': 42,
+                            'x': 100,
+                            },
+                      'f': 12,
+                      'b': 15,
+                      },
+                'q': 90,
+                }
           }
 
+
 # Переводим в такой вид:
-result = [('b', 1), ('c.d', 2), ('c.f', 3), ('e.i', 4), ('e.j.k', 5), ('e.j.l', 6), ('m.n', 7),
-          ('m.o.p', 8), ('m.o.r.s', 9), ('m.o.r.t', 10), ]
+result = [('a', 11), ('b', 1), ('c.d', 2), ('c.f', 3), ('e.i', 4), ('e.j.k', 5), ('e.j.l', 6), ('m.n', 7), ('m.o.p', 8),
+          ('m.o.r.s', 9), ('m.o.r.t', 10), ('u.q', 90), ('u.w.b', 15), ('u.w.f', 12), ('u.w.z.x', 100), ('u.w.z.y', 42),
+          ]
 
 
 def dict_to_list(sub_tree: dict, current_name: str, items_list: List[tuple]) -> List[tuple]:
@@ -48,13 +59,13 @@ def dict_to_list(sub_tree: dict, current_name: str, items_list: List[tuple]) ->
 
 
 res = dict_to_list(forest, '', [])
-print(res)
+print(sorted(res))
 
 
 # Reverse task:
 
 
-def list_to_dict(data: List[Tuple['str', int]]) -> dict:
+def list_to_dict(data: List[Tuple[str, int]]) -> dict:
     tree = {}
     for item in data:
         curr_tree = tree
@@ -70,3 +81,33 @@ def list_to_dict(data: List[Tuple['str', int]]) -> dict:
 
 parsed = json.dumps(list_to_dict(result), indent=4)
 print(parsed)
+
+
+# without recursion
+
+def dict_to_list_without_recursion(data: Dict[str, Union[int, dict]]) -> List[Tuple[str, Union[int, dict]]]:
+    result_list = []
+    temp_lst = []
+    count = 0
+
+    for key, value in data.items():
+        if isinstance(value, dict):
+            count += 1
+        temp_lst.append((key, value))
+
+    for _ in range(count):
+        for item in temp_lst:
+            if isinstance(item[1], dict):
+                temp_lst.remove(item)
+                for sub_key, sub_value in item[1].items():
+                    temp_lst.append((f'{item[0]}.{sub_key}', sub_value))
+            else:
+                if item not in result_list:
+                    result_list.append(item)
+
+    del temp_lst
+    return result_list
+
+
+res_lst = dict_to_list_without_recursion(forest)
+print(sorted(res_lst))