# [Python 2], 65 bytes

<!-- language-all: lang-python -->

 f=lambda l,n:l and[sum(l[:len(l)/n+1])]+f(l[len(l)/n+1:],n-1)or[]

[Try it online!][TIO-jfa3nuav]

[Python 2]: https://docs.python.org/2/
[TIO-jfa3nuav]: https://tio.run/##RchLCoAgEADQq8xSaSLssxE6iczCKCkYR@mz6PTmrt3j5ffek/SlhJl9XFYPjGIZvKzueqJiZ3kTxbqTxpCmJtT6xxJKa3Q6HZV8HnJDUM4g9AgDwogwUZUuHw "Python 2 – Try It Online"