children precede their parents and the order of appearance in __bases__ is respected.

why not to use super in object classes: The problem with incompatible signatures https://www.artima.com/weblogs/viewpost.jsp?thread=281127

why (swap the print and super in each command)
class First(object):
    def __init__(self):
        super(First, self).__init__()
        print("first")

class Second(object):
    def __init__(self):
        super(Second, self).__init__()
        print("second")

class Third(First, Second):
    def __init__(self):
        super(Third, self).__init__()
        print("third")

Third()
print(Third.__mro__)

second
first
third
(<class '__main__.Third'>, <class '__main__.First'>, <class '__main__.Second'>, <class 'object'>)
[Finished in 0.0s]


https://www.datacamp.com/community/data-science-cheatsheets

https://www.datacamp.com/community/tutorials/decorators-python - functions returning other functions?