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November 29th, 2012, 01:46 PM

blobman23

Registered User

Join Date: Nov 2012

Posts: 16

Time spent in forums: 2 h 41 m 15 sec
Reputation Power: 0

Help!

Here is the assignment:

For this assignment, you must implement a course grading program. Your program should read from an input file called "grades.txt" of the following format:
2
John Doe
82
100
57
0
Jane Smith
91
12
45
81
0
The first number represents the total number of students included in the file. The number of grades for each student is unknown. The zero signifies the end of a student's grades. Your program should calculate the average of each student’s grades and output the following to the screen (with the grades now sorted, ascending):
John Doe 57, 82, 100 -- B
Jane Smith 12, 45, 81, 91 -- A
Your program should write to an output file called “summary.txt” a summary like the following:
Number of students: 12
Average grade: 72.5
Highest grade: 97
Lowest grade: 34
Student with longest name: Jane Smith
You must create a class called Student that represents a student's information. This class must contain attributes for the first name, last name, and list of grades. It must override the __str__ method that prints the student information as it should be displayed to the screen (see above). It must also provide a method called get_average that returns the average grade for the student, as well as a method called get_letter that returns the letter grade representation of the student's average.

This is what I have:

Code:

class Student(object):
    def __init__(self, name=""):
        self.name = name
        self.grades = []
    def get_average(self):
        return sum(self.grades) / float(len(self.grades))
    def get_letter(self):
        if get_average >= 89.5:
            return 'A'
        elif 79.5 <= get_everage <= 89.4:
            return 'B'
        elif 69.5 <= get_everage <= 79.4:
            return 'C'
        elif 59.5 <= get_everage <= 69.4:
            return 'D'
        elif get_average <= 59.4:
            return 'F'
    def __str__(self):
        return "%s %0.2f %s" % (self.name, self.get_average(), self.get_letter())

November 29th, 2012, 01:55 PM

blobman23

Registered User

Join Date: Nov 2012

Posts: 16

Time spent in forums: 2 h 41 m 15 sec
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update:

This is now what I have:

Code:

def class_student(object):
	def init(self,name,grades):
		self.name=name
def str(self):
	string=self.name
	for i in range(len(list)):
		string+=str(grades[i])
	string+="__"+ getLetter()
	return string
def get_average(self):
	for i in range(len(list)):
		avg+=int(list[i])
		avg1=len(list)
	return avg
def get_letter(self,avg):
	if avg >89:
		return"A"
	elif avg == 89 and avg >79:
		return"B"
	if avg <79 and avg>69:
		return"C"
	elif avg <=69 and avg>59:
		return"D"
	else:
		return"F"
infile =open("grades.txt", "r")
gradeslist = infile.readlines()
students=gradeslist[0]
i=1 
stuList=[]
for i in range(len(gradeslist)):
	students=students(gradeslist[i])
	grade=-1
	while true:
		i+=1
		grades =gradeslist[i]
	if grades == 0:
		break
else:
	students.addGrade(gradeslist[i])

student.sort(Grades())
stuList.append(student)
for i in range(studList):
print str(stuList[i])
outfile=open("Summary.txt", "W")
outfile.write("number fo Students:"+numstudents+"\n")

November 29th, 2012, 03:30 PM

b49P23TIvg

Contributing User

Join Date: Aug 2011

Posts: 3,360

Time spent in forums: 1 Month 2 Weeks 3 Days 9 h 55 m 30 sec
Reputation Power: 383

retrograde programming

blobman23! What's the deal? You retrogress. What happened to your class?

Check out this version of get_letter!

Code:

def get_letter(avg):
    return 'ABCDF'[sum(avg <= cutoff for cutoff in range(60,100,10))]

__________________
[code]Code tags[/code] are essential for python code!

November 29th, 2012, 04:02 PM

b49P23TIvg

Contributing User

Join Date: Aug 2011

Posts: 3,360

Time spent in forums: 1 Month 2 Weeks 3 Days 9 h 55 m 30 sec
Reputation Power: 383

Code:

class Student:

    def __init__(self,first_name,last_name,grades):
        self.first_name = first_name
        self.last_name = last_name
        grades.sort()
        self.grades = grades

    def __str__(self):
        return '%s %s %s -- %s'%(
            self.first_name,self.last_name,
            str(self.grades)[1:-1],
            self.get_letter())

    def get_average(self):
        a = self.grades
        return sum(a)/float(len(a))

    def get_letter(self):
        a = self.get_average()
        return 'ABCDF'[sum(a <= cutoff for cutoff in range(60,100,10))]

November 29th, 2012, 07:53 PM

dwblas

Contributing User

Join Date: May 2009

Posts: 291

Time spent in forums: 3 Days 18 h 33 m 44 sec
Reputation Power: 7

I'm not sure if you got how to split the records on each student. It is pretty standard stuff when dealing with files. This creates a list of lists, with a sub-list for each student.

Code:

test_data="""2
John Doe
82
100
57
0
Jane Smith
91
12
45
81
0
Buggs Bunny
92
13
46
82
0"""

readlines_test=test_data.split("\n")
print readlines_test

list_o_students = []
junk_list = []
for ctr in range(1, len(readlines_test)):
    rec=readlines_test[ctr].strip()
    if "0" == rec[0]:
        if len(junk_list):
            list_o_students.append(junk_list)
        junk_list = []
    else:
        junk_list.append(rec)

if len(junk_list):     ## append final group if no zero
    list_o_students.append(junk_list)

print "-"*50
for each_list in list_o_students:
    print each_list

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