python-fill-docstring-style

python-fill-docstring-style is a variable defined in `python.el'.
Its value is

pep-257

• This variable is safe as a file local variable if its value
  satisfies the predicate which is a byte-compiled expression.
  

Documentation:
Style used to fill docstrings.
This affects `python-fill-string' behavior with regards to
triple quotes positioning.

Possible values are `django', `onetwo', `pep-257', `pep-257-nn',
`symmetric', and nil. A value of nil won't care about quotes
position and will treat docstrings a normal string, any other
value may result in one of the following docstring styles:

`django':

"""
Process foo, return bar.
"""

"""
Process foo, return bar.

If processing fails throw ProcessingError.
"""

`onetwo':

"""Process foo, return bar."""

"""
Process foo, return bar.

If processing fails throw ProcessingError.

"""

`pep-257':

"""Process foo, return bar."""

"""Process foo, return bar.

If processing fails throw ProcessingError.

"""

`pep-257-nn':

"""Process foo, return bar."""

"""Process foo, return bar.

If processing fails throw ProcessingError.
"""

`symmetric':

"""Process foo, return bar."""

"""
Process foo, return bar.

If processing fails throw ProcessingError.
"""

You can customize this variable.