I can find that about arrays, but for unknown reasons I failed to find that about lists.

I'm a newb too, but from what I understand list in python is equivalent (but not identical) to an array in most other languages, for example an array in C. So if you find an answer for array, you must take it as a list.

As pointed out in the PyCharm docs, a (legacy, pre-PEP-484) way of doing this is using square brackets:

list[Foo]: List of Foo elements

dict[Foo, Bar]: Dict from Foo to Bar

list of str, as suggested in the accepted answer, does not work as expected in PyCharm.

Starting with Python 3.5 and the implementation of PEP-484, you can also use type hints, which may be nicely supported by your IDE/editor. How this is easily done in PyCharm is explained here.

In essence, to declare a list return type using type-hinting (Python >=3.5), you may do something like this:

from typing import List

"""
Great foo function.

:rtype: list[str]
"""
def foo() -> List[str]:
    return ['some string', 'some other string']

Here we declare (somewhat redundantly) that the function foo returns a list of strings, both in the type hint -> List[str] and in the docstring :rtype: list[str].

Other pre-declared types and more info can be found in the Python docs for typing.