diff --git a/exercises/practice/accumulate/accumulate.py b/exercises/practice/accumulate/accumulate.py
index bd64897e110..9462f350151 100644
--- a/exercises/practice/accumulate/accumulate.py
+++ b/exercises/practice/accumulate/accumulate.py
@@ -1,2 +1,5 @@
 def accumulate(collection, operation):
-    pass
+    result = []
+    for item in collection:
+        result.append(operation(item))
+    return result
diff --git a/exercises/practice/hello-world/hello_world.py b/exercises/practice/hello-world/hello_world.py
index adaa6c2c997..d695ea11589 100644
--- a/exercises/practice/hello-world/hello_world.py
+++ b/exercises/practice/hello-world/hello_world.py
@@ -1,2 +1,2 @@
 def hello():
-    return 'Goodbye, Mars!'
+    return 'Hello, World!'