What's the difference between self.__x and self.x

Question

I an trying to learn Python and I have a question. What's the difference between:

class A:

def __init__(self, name=""):
    self.name = name

and

class A:

def __init__(self, name=""):
    self.__name = name

I noticed that if I use the second option I get errors, but If I want to make getters and setter for my class, I need to use the "__name" form