Nested Dictionary.py

def nested_dictionary(l1, l2, l3):
     result = [{x: {y: z}} for (x, y, z) in zip(l1, l2, l3)]
     return result

student_id = ["S001", "S002", "S003", "S004"] 
student_name = ["Adina Park", "Leyton Marsh", "Duncan Boyle", "Saim Richards"] 
student_grade = [85, 98, 89, 92]
print("Original strings:")
print(student_id)
print(student_name)
print(student_grade)
print("\nNested dictionary:")
ch='a'
print(nested_dictionary(student_id, student_name, student_grade))