__init__ constructor

def __init__(self):
    ...

from groupdocs.annotation import Annotator
from groupdocs.annotation.models import Rectangle
from groupdocs.annotation.models.annotation_models import PointAnnotation

with Annotator("./sample.pdf") as annotator:
    point = PointAnnotation()
    point.box = Rectangle(100, 100, 0, 0)   # positioned by box origin
    point.page_number = 0
    point.message = "This is a point annotation"
    annotator.add(point)
    annotator.save("./output.pdf")