PYTHON 3 Object Oriented Programming
***a9q3.py file below***
class GradeItem(object):
# A Grade Item is anything a course uses in a grading scheme,
# like a test or an assignment. It has a score, which is assessed by
# an instructor, and a maximum value, set by the instructor, and a weight,
# which defines how much the item counts towards a final grade.
def __init__(self, weight, scored=None, out_of=None):
"""
Purpose:
Initialize the GradeItem object.
Preconditions:
:param weight: the weight of the GradeItem in a grading scheme
:param scored: the scored obtained in the grade item
:param out_of: the maximum possible score for the grade item
"""
self.weight = weight
self.scored = scored
self.out_of = out_of
def __str__(self):
"""
Purpose:
Represent the Grade object as a string.
If the item has not been assessed yet, N/A is used.
This function gets called by str().
Return:
A string representation of the Grade.
"""
if self.scored is None or self.out_of is None:
return 'N/A'
else:
return str(self.scored) + '/' + str(self.out_of)
def record_outcome(self, n, d):
"""
Purpose:
Record the outcome of the GradeItem.
Preconditions:
:param n: The score obtained on the item
:param d: The maximum score on the item
Post-conditions:
Changes the data stored in the GradeItem
Return: None
"""
self.scored = n
self.out_of = d
def contribution(self):
"""
Purpose:
Calculate and return the contribution this GradeItem makes
to a grading scheme. If the item has not been assessed,
a value of zero is returned.
Return:
The weighted contribution of the GradeItem.
"""
if self.scored is None or self.out_of is None:
return 0
else:
return self.weight * self.scored / self.out_of
class StudentRecord(object):
def __init__(self, first, last, st_number):
"""
Purpose: Initialize the Student object.
Preconditions:
:param first: The student's first name, as a string
:param last: The student's last name, as a string
:param st_number: The student's id number, as a string
"""
self.first_name = first
self.last_name = last
self.id = st_number
self.midterm = None
self.labs = []
def drop_lowest(self, grades):
"""
Purpose:
Sets the weight of the lowest grade in grades to zero.
Pre-conditions:
:param grades: a list of GradeItems
Post-conditions:
One of the grade items has its weight set to zero
Return:
:return: None
"""
pass
def calculate(self):
"""
Purpose:
Calculate the final grade in the course.
Return:
The final grade.
"""
return round(self.midterm.contribution()
+ sum([b.contribution() for b in self.labs]))
def display(self):
"""
Purpose:
Display the information about the student, including
all lab and assignment grades, and the calculation of the total grade.
:return:
"""
print("Student:", self.first_name, self.last_name,
'(' + self.id + ')')
print("\tCourse grade:", self.calculate())
print('\tMidterm:', str(self.midterm))
#
print('\tLabs:', end=" ")
for g in self.labs:
if g.weight == 0:
print('[' + str(g) + ']', end=' ')
else:
print(str(g), end=' ')
print()
def read_student_record_file(filename):
"""
Purpose:
Read a student record file, containing information about the student.
Line 1: Out of: the maximum score for the grade items
Line 2: Weight: the weight of the grade items in the grading scheme
Lines 3...: Student records as follows:
Student Number, Lastname, Firstname, 10 lab marks, 10 assignment marks, midterm, final
Pre-conditions:
:param filename: A text file, comma-separated, with the above format.
Return:
:return: A list of StudentRecords constructed from the named file.
"""
f = open(filename)
# Second line tells us what the grade items are out of
out_of_line = f.readline().rstrip().split(',')
out_of = [int(i) for i in out_of_line[1:]]
lab_out_of = out_of[0:10]
assignments_out_of = out_of[10:20]
mt_out_of = out_of[20]
final_out_of = out_of[21]
# Third line tells us the weight of each item
weight_line = f.readline().rstrip().split(',')
weights = [int(i) for i in weight_line[1:]]
lab_weights = weights[0:10]
assignment_weights = weights[10:20]
mt_weight = weights[20]
final_weight = weights[21]
# Read all the students in the file:
students = list()
for line in f:
student_line = line.rstrip().split(',')
student = StudentRecord(student_line[2],student_line[1],student_line[0])
labs = [int(lab) for lab in student_line[3:13]]
assignments = [int(a) for a in student_line[13:23]]
for g,o,w in zip(labs,lab_out_of,lab_weights):
student.labs.append(GradeItem(w,g,o))
student.midterm = GradeItem(mt_weight,int(student_line[23]),mt_out_of)
students.append(student)
return students
if __name__ == '__main__':
course = read_student_record_file('students.txt')
# display the students
print('------------- Before ---------------')
for s in course:
s.display()
# drop lowest lab for all students
for s in course:
s.drop_lowest(s.labs)
# display the students
print('------------- After ----------------')
for s in course:
s.display()
***Students.txt file below***
Out
of,4,4,4,4,4,4,4,4,4,4,41,50,35,60,70,55,45,50,60,60,60,90
Weights,1,1,1,1,1,1,1,1,1,1,4,4,4,4,4,4,4,4,4,4,10,40
3111332,Einstein,Albert,4,4,3,4,4,3,4,3,3,4,39,46,34,58,65,45,25,10,40,35,35,50
3216842,Curie,Marie,3,4,3,4,3,4,1,4,1,4,41,45,30,50,61,48,37,43,55,58,55,85
*The solution code returns 78.5 of avg when the lowest grades are NOT dropped from the student.txt file. On the other hand, if they ARE dropped for BOTH labs and assignments, the avg becomes 80.5
Homework Answers
class GradeItem(object):
# A Grade Item is anything a course uses in a grading scheme,
# like a test or an assignment. It has a score, which is assessed by
# an instructor, and a maximum value, set by the instructor, and a weight,
# which defines how much the item counts towards a final grade.
def __init__(self, weight, scored=None, out_of=None):
"""
Purpose
Initialize the GradeItem object.
Preconditions:
:param weight: the weight of the GradeItem in a grading scheme
:param scored: the scored obtained in the grade item
:param out_of: the maximum possible score for the grade item
"""
self.weight = weight
self.scored = scored
self.out_of = out_of
def __str__(self):
"""
Purpose:
Represent the Grade object as a string.
If the item has not been assessed yet, N/A is used.
This function gets called by str().
Return:
A string representation of the Grade.
"""
if self.scored is None or self.out_of is None:
return 'N/A'
else:
return str(self.scored) + '/' + str(self.out_of)
def record_outcome(self, n, d):
"""
Purpose:
Record the outcome of the GradeItem.
Preconditions:
:param n: The score obtained on the item
:param d: The maximum score on the item
Post-conditions:
Changes the data stored in the GradeItem
Return: None
"""
self.scored = n
self.out_of = d
def contribution(self):
"""
Purpose:
Calculate and return the contribution this GradeItem makes
to a grading scheme. If the item has not been assessed,
a value of zero is returned.
Return:
The weighted contribution of the GradeItem.
"""
if self.scored is None or self.out_of is None:
return 0
else:
return self.weight * self.scored / self.out_of
class StudentRecord(object):
def __init__(self, first, last, st_number):
"""
Purpose: Initialize the Student object.
Preconditions:
:param first: The student's first name, as a string
:param last: The student's last name, as a string
:param st_number: The student's id number, as a string
"""
self.first_name = first
self.last_name = last
self.id = st_number
self.midterm = None
self.labs = []
self.final_exam = None
self.assignments = []
def drop_lowest(self, grades):
"""
Purpose:
Sets the weight of the lowest grade in grades to zero.
Pre-conditions:
:param grades: a list of GradeItems
Post-conditions:
One of the grade items has its weight set to zero
Return:
:return: None
"""
if(len(grades) > 0):
minIndex = 0
totalWeight = sum([g.weight for g in grades]) # calculate the total weight
# loop to get the minimum scored grade
for i in range(1,len(grades)):
if grades[i].scored < grades[minIndex].scored:
minIndex = i
grades[minIndex].weight = 0
newWeight = (float(totalWeight))/(len(grades)-1) # calculate the new weight after removing the lowest grade
# loop to redistribute the weights
for i in range(1,len(grades)):
if i != minIndex:
grades[i].weight= newWeight
def calculate(self):
"""
Purpose:
Calculate the final grade in the course.
Return:
The final grade.
"""
return round(self.midterm.contribution()
+ sum([b.contribution() for b in self.labs]) + self.final_exam.contribution() + sum([a.contribution() for a in self.assignments]))
def display(self):
"""
Purpose:
Display the information about the student, including
all lab and assignment grades, and the calculation of the total grade.
:return:
"""
print("Student:", self.first_name, self.last_name,'(' + self.id + ')')
print("\tCourse grade:", self.calculate())
print('\tMidterm:', str(self.midterm))
print('\tLabs:', end=" ")
for g in self.labs:
if g.weight == 0:
print('[' + str(g) + ']', end=' ')
else:
print(str(g), end=' ')
print()
print('\tAssignments : '),
for g in self.assignments:
if g.weight == 0:
print('[' + str(g) + ']', end=' ')
else:
print(str(g), end=' ')
print()
print('\tFinal Exam : ',str(self.final_exam))
def read_student_record_file(filename):
"""
Purpose:
Read a student record file, containing information about the student.
Line 1: Out of: the maximum score for the grade items
Line 2: Weight: the weight of the grade items in the grading scheme
Lines 3...: Student records as follows:
Student Number, Lastname, Firstname, 10 lab marks, 10 assignment marks, midterm, final
Pre-conditions:
:param filename: A text file, comma-separated, with the above format.
Return:
:return: A list of StudentRecords constructed from the named file.
"""
f = open(filename)
# First line tells us what the grade items are out of
out_of_line = f.readline().rstrip().split(',')
out_of = [int(i) for i in out_of_line[1:]]
lab_out_of = out_of[0:10]
assignments_out_of = out_of[10:20]
mt_out_of = out_of[20]
final_out_of = out_of[21]
# Second line tells us the weight of each item
weight_line = f.readline().rstrip().split(',')
weights = [int(i) for i in weight_line[1:]]
lab_weights = weights[0:10]
assignment_weights = weights[10:20]
mt_weight = weights[20]
final_weight = weights[21]
# Read all the students in the file:
students = list()
for line in f:
student_line = line.rstrip().split(',')
student = StudentRecord(student_line[2],student_line[1],student_line[0])
labs = [int(lab) for lab in student_line[3:13]]
assignments = [int(a) for a in student_line[13:23]]
for g,o,w in zip(labs,lab_out_of,lab_weights):
student.labs.append(GradeItem(w,g,o))
for g,o,w in zip(assignments,assignments_out_of,assignment_weights):
student.assignments.append(GradeItem(w,g,o))
student.midterm = GradeItem(mt_weight,int(student_line[23]),mt_out_of)
student.final_exam = GradeItem(final_weight,int(student_line[24]),final_out_of)
students.append(student)
return students
if __name__ == '__main__':
course = read_student_record_file('students.txt')
# display the students
print('------------- Before ---------------')
for s in course:
s.display()
#calculate class average
total = 0
for s in course:
total += s.calculate()
avg = total/len(course)
print('Average : '+str(avg))
# drop lowest lab and lowest assignment for all students
for s in course:
s.drop_lowest(s.labs)
s.drop_lowest(s.assignments)
# display the students
print('------------- After ----------------')
for s in course:
s.display()
#calculate class average
total = 0
for s in course:
total += s.calculate()
avg = total/len(course)
print('Average : '+str(avg))
#end of program
Code Screenshot:
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***a9q3.py file below***
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