list.sort() returning None

[DeaD_EyE]

There is no mention in the Documentation, that this method return a None.
But, it returns None and sorts the list in-place.

I guess the expectation comes from str. The str methods always return a new str, because str is immutable.

If the original order is also required, then use sorted. If you don't care about the previous order, just use the sort method of the list instance. But do not assign the result to the name. Then the name refers to None and the list instance disappears after the garbage collector has done its work.