Abaqus - secondary development. How to get the number of the frames in one step?

from odbAccess import openOdb

my_odb = openOdb(r"D:/temp:/Job-1.odb")

step = my_odb.steps["Step-1"]

frame = step.Frame


I want to know how many increments there is in this Step-1? How can I do that?

Abaqus ​​​​​​​