PYTHON 3.6

Task 2 - GradeBook This represents an entire grouping of Grade values as a list (named grades). We can then dig through this list for interesting things and calculations by calling the methods we're going to implement.

class GradeBook: Define the GradeBook class.

def __init__(self): GradeBook constructor. Create the only instance variable, a list named grades, and initialize it to an empty list. This means that we can only create an empty GradeBook and then add items to it later on.

def __str__(self): returns a human-centric string representation. We'll choose a multi-line representation (slightly unusual) that contains "GradeBook:" on the first line, and then each successive line is a tab, the str() representation of the next Grade in self.grades, and then a newline each time. This means that the last character of the string is guaranteed to be a newline (regardless of if we have zero or many Grade values).

def __repr__(self): We will be lazy and tell this to just represent the exact same thing as __str__. But don't cut-paste the code! Use this as the entire body of this function:

return str(self)

def add_grade(self, grade): append the argument Grade to the end of self.grades

def average_by_kind(self, kind): Look through all stored Grade objects in self.grades. All those that are the same kind as the kind parameter should be averaged together (sum their percents and divide by the number of things of that kind). If none of that kind exist, return None. def get_all_of(self, kind): create and return a list of references to each Grade object in this GradeBook that is of that kind.

def get_by_name(self, name): search through self.grades in order and return the first Grade by the given name. If no such Grade value can be found (say, name=="whatever"), then raise a GradingError with the message "no Grade found named 'whatever'". (You can skip this exception-raising part and come back to it).

Tester: https://paste.ee/p/KXIQj