Does a derived class automatically have all the attributes of the base class?

There seems to be no good online documentation on this: If I make a derived class, will it automatically have all the attributes of the base class? But what's the BaseClass.__init() for, do you also need to do it to other base class methods? Does BaseClass.__init__() need arguments? If you have arguments for your base class __init__(), are they also used by the derived class, do you need to explicitly set the arguments to the derived classe's __init__(), or set them to BaseClass.__init__() instead?