python 3.x - putting current class as return type annotation -

in python 3 can make arguments , return type annotations. example:

class graph:     def __init__(self, v: int, e: int, edges: list):         pass      @classmethod     def fromfile(cls, readobj: type(sys.stdin)):         pass      def v(self) -> int:         pass      def e(self) -> int:         pass 

the problem can't make annotation return type of current class (graph), not defined yet. example:

class graph:    def reverse(self) -> graph:        pass 

this code goes error

def reverse(self) -> graph: nameerror: name 'graph' not defined 

these annotations useful both documenting , allowing ide recognize argument , return types => enable autocomplete

upd: came either impossible or requires hacks don't like, decided use def reverse (self) -> 'graph': understandable documentation although breaks rule. downside doesn't work ide autocomplete.

so after while can decision took using -> 'graph' instead of -> graph. not make ide (pycharm) able recognize type way works enough documentation purposes.

another possible solution use changing annotation @ runtime doesn't solve problem documentation - won't want type declarations somewhere in middle of sources...

the problem has roots in recognizing class object before class defined. impossible in python.