diff --git a/projects/004-flatten-a-list/python/main.py b/projects/004-flatten-a-list/python/main.py
index e69de29..cf98efb 100644
--- a/projects/004-flatten-a-list/python/main.py
+++ b/projects/004-flatten-a-list/python/main.py
@@ -0,0 +1,18 @@
+def flatten_a_list(unflattened_list):
+
+    if not unflattened_list:
+        return unflattened_list
+
+    else:
+
+        if isinstance(unflattened_list[0], list):
+            l1 = flatten_a_list(unflattened_list[0])
+            l2 = flatten_a_list(unflattened_list[1:])
+
+            return l1 + l2
+
+        else:
+            l1 = [unflattened_list[0]]
+            l2 = flatten_a_list(unflattened_list[1:])
+
+            return l1 + l2