u3

u3/flatten_array.py

@@ -0,0 +1,15 @@
+def flatten(iterable):
+    result = [] 
+    copy = list(iterable)
+
+    while copy:
+
+        item = copy.pop(0)
+
+        if isinstance(item,list):
+            copy = item + copy
+
+        elif item is not None:
+            result.append(item)
+            
+    return result