example:

class Animal:
    """
    A class used to represent an Animal

    ...

Attributes
----------
says_str : str
    a formatted string to print out what the animal says
name : str
    the name of the animal
sound : str
    the sound that the animal makes
num_legs : int
    the number of legs the animal has (default 4)

Methods
-------
says(sound=None)
    Prints the animals name and what sound it makes
"""

says_str = "A {name} says {sound}"

def __init__(self, name, sound, num_legs=4):
    """
    Parameters
    ----------
    name : str
        The name of the animal
    sound : str
        The sound the animal makes
    num_legs : int, optional
        The number of legs the animal (default is 4)
    """

    self.name = name
    self.sound = sound
    self.num_legs = num_legs

def says(self, sound=None):
    """Prints what the animals name is and what sound it makes.

    If the argument `sound` isn't passed in, the default Animal
    sound is used.

    Parameters
    ----------
    sound : str, optional
        The sound the animal makes (default is None)

    Raises
    ------
    NotImplementedError
        If no sound is set for the animal or passed in as a
        parameter.
    """

    if self.sound is None and sound is None:
        raise NotImplementedError("Silent Animals are not supported!")

    out_sound = self.sound if sound is None else sound
    print(self.says_str.format(name=self.name, sound=out_sound))

Yep, listing methods in the class docstring, then each method again documented, according to this standard. I reccomend using sphinx, though: https://www.sphinx-doc.org/en/master/contents.html