Flatten a list: Difference between revisions

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 Function flat is iterative and flattens the list in-place. It follows the Python idiom of returning None when acting in-place:
 <lang python>>>> def flat(lst):
-	i=0
+    i=0
-	while i<len(lst):
+    while i<len(lst):
-		while True:
+        while True:
-			try:
+            try:
-				lst[i:i+1] = lst[i]
+                lst[i:i+1] = lst[i]
-			except (TypeError, IndexError):
+            except (TypeError, IndexError):
-				break
+                break
-		i += 1
+        i += 1
 >>> lst = [[1], 2, [[3,4], 5], [[[]]], [[[6]]], 7, 8, []]
 >>> flat(lst)