View difference between Paste ID: 6xYxPPZ8 and nQHx0TVC

 # (mask, min, max)
 occ = [("?d", 0, 3),
        ("?l", 3, 5),
        ("?u", 1, 1),
        ("?s", 0, 2)]
 
 pwlen = [8, 9]
 
 from collections import OrderedDict
 
 def getMasks(occurrences, length, depth=0):
     char, min, max = occurrences.pop(0)
     char = [char]
     results = []
     for combination in range(min, max+1):
         if not occurrences:
             results += [char*combination]
         else:
-            results += list(map(
+            res = getMasks(occurrences[:], length-combination, depth+1)
-                lambda apx: char*combination + apx,
+            if res is not None:
-                getMasks(occurrences[:], length-combination, depth+1)))
+                results += list(map(lambda apx: char*combination + apx, res))
-    if occurrences and not filter(
+    if occurrences and not list(filter(
-            lambda x: True if len(x) == length else False, results):
+            lambda x: True if len(x) == length else False, results)):
         return None
     return results
 
 masks = []
 
 for pwl in pwlen:
     masks += getMasks(occ[:], pwl)
-masks = list(filter(lambda msk: True if len(msk) in pwlen else False, masks))
+masks = filter(lambda msk: True if len(msk) in pwlen else False, masks)
-masks = list(map(lambda x: "".join(x), masks))
+masks = map(lambda x: "".join(x), masks)
-masks = list(OrderedDict.fromkeys(masks))
+masks = OrderedDict.fromkeys(masks)
 
 for m in masks:
     print(m)