Given a partial class definition below:

class Gradebook: def __init__(self, course_name, records): """ Required arguments: course_name: a string that represents the course name records: a dictionary with each entry representing a student score pair """ self.records = {} self.course_name = course_name self.records.update(records) def remove(self, student): del self.records[student] def __repr__(self): # substitute your code for pass below pass def update(self, student, score): # substitute your code below for pass below pass

Complete the definitions for the __repr__(self) and update(self, student, score) methods so that invoking them will generate outputs as follows:

Code cell 1:

gradebook1 = Gradebook('Python Programming', {'Troy': 92, 'Calvin': 95, 'James': 89, 'Charles': 100, 'Bryn': 59, 'Alice': 95}) gradebook1

Output 1:

Troy -> 92 Calvin -> 95 James -> 89 Charles -> 100 Bryn -> 59 Alice -> 95

Code cell 2:

gradebook1.update("Amy", 100)

Output 2:

A new record (Amy -> 100) is added!

Code cell 3:

gradebook1.update("Bryn", 62)

Output 3:

Bryn's score has been updated from 59 to 62!