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python/snippets/spread.md

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+---
+title: Spread list
+type: snippet
+tags: [list]
+cover: digital-nomad-14
+dateModified: 2020-09-15T16:13:06+03:00
+---
+
+Flattens a list, by spreading its elements into a new list.
+
+- Loop over elements, use `list.extend()` if the element is a list, `list.append()` otherwise.
+
+```py
+def spread(arg):
+  ret = []
+  for i in arg:
+    ret.extend(i) if isinstance(i, list) else ret.append(i)
+  return ret
+```
+
+```py
+spread([1, 2, 3, [4, 5, 6], [7], 8, 9]) # [1, 2, 3, 4, 5, 6, 7, 8, 9]
+```