Defining instance methods in Python

Please add a private attribute __score to the person class, represent fractions, and then add an instance method Get_grade (), which can return a-excellent, B-pass, C-fail three files according to the value of __score.

class Person (object):

def __init__ (self, Name, score):
Self.name=name
Self.__score=score
#good =a
#fine =b
#nonono =c

def get_grade (self):
If self.__score>=90:
Return ' A '
if (self.__score<90) and (self.__score>=60):
Return ' B '
If self.__score<60:
Return ' C '

P1 = person (' Bob ', 40)
P2 = person (' Alice ', 65)
P3 = person (' Tim ', 48)

Print (P1.get_grade ())
Print (P2.get_grade ())
Print (P3.get_grade ())

Defining instance methods in Python