Here is the latest code and error:
Traceback (most recent call last):
File "D:\Python24\grades.py", line 99, in -toplevel-
save_grades(students,filename)
File "D:\Python24\grades.py", line 51, in save_grades
out_file.write(x+","+max_points[x]+"\n")
TypeError: unsupported operand type(s) for +: 'int' and 'str'
max_points = [25,25,50,25,100]
assignments = ['hw ch 1','hw ch 2','quiz ','hw ch 3','test']
students = {1:max_points}
def print_menu():
print "1. Add student"
print "2. Remove student"
print "3. Print grades"
print "4. Record grade"
print "5. Load Grades"
print "6. Save Grades"
print "9. Exit"
def print_all_grades():
print '\t',
for i in range(len(assignments)):
print assignments[1],'\t',
print
keys = students.keys()
keys.sort()
for x in keys:
print x,'\t',
grades = students[x]
print_grades(grades)
def print_grades(grades):
for i in range(len(grades)):
print grades[i],'\t\t',
print
def choice():
return int(raw_input("Menu Choice: "))
def school():
return int(raw_input("Student ID: "))
def load_grades(students,filename):
in_file = open(filename, "r")
while 1:
in_line = in_file.readline()
if in_line == "":
break
in_line = in_line[:-1]
[students,max_points] = string.split(in_line,",")
max_points[students] = grade
in_file.close()
def save_grades(students,filename):
out_file = open(filename, "w")
for x in students.keys():
out_file.write(x+","+max_points[x]+"\n")
out_file.close
print "Grade Tracking Program."
while 1:
print_menu()
menu_choice = choice()
if menu_choice == 1:
print "Add student"
ID = school()
students[ID] = [0]*len(max_points)
elif menu_choice == 2:
print "Remove student"
ID = school()
if students.has_key(ID):
del students[ID]
else:
print "Student ID: ",ID," not found."
elif menu_choice == 3:
print_all_grades()
elif menu_choice == 4:
print "Record Grade"
ID = school()
if students.has_key(ID):
grades = students[ID]
print "Type in the number of the grade to record"
print "Type in a 0 (zero) to exit"
for i in range(len(assignments)):
print i+1,' ',assignments[i],'\t',
print
print_grades(grades)
which = 1234
while which != -1:
which = int(raw_input("Change which Grade: "))
which = which-1
if 0 <= which < len(grades):
grade = int(raw_input("Grade: "))
grades[which] = grade
elif which != -1:
print "Invalid Grade Number"
else:
print "Student not found"
elif menu_choice == 5:
filename = raw_input("Filename to load: ")
load_grades(students,filename)
elif menu_choice == 6:
filename = raw_input("Filename to save: ")
save_grades(students,filename)
elif menu_choice == 9:
break
else:
print "That's not a choice!"
print "Goodbye."
How can I fix it?
----- Original Message -----
From: "Nathan Pinno" <[EMAIL PROTECTED]>
To: "Alan G" <[EMAIL PROTECTED]>; "Yoo, Danny"
<[EMAIL PROTECTED]>; "Bark, Adam" <[EMAIL PROTECTED]>
Cc: "Tutor" <tutor@python.org>
Sent: Wednesday, August 03, 2005 12:42 PM
Subject: Re: [Tutor] I've run into a jam on the exercise on file I/O
> I've been chatting with Albertito on MSN and came up with this solution:
> int(x), and change student into student ids, and remove #Max. Will this
> work, or will I need to add sequential IDs?
> ----- Original Message -----
> From: "Alan G" <[EMAIL PROTECTED]>
> To: "Nathan Pinno" <[EMAIL PROTECTED]>; "Yoo, Danny"
> <[EMAIL PROTECTED]>; "Bark, Adam" <[EMAIL PROTECTED]>
> Cc: "Tutor" <tutor@python.org>
> Sent: Tuesday, August 02, 2005 1:43 AM
> Subject: Re: [Tutor] I've run into a jam on the exercise on file I/O
>
>
>>
>>> What if I were to use ID's for the students and use the ID's as the
>>> sequence
>>> index, and link the students and their grades to the IDs?
>>
>> Its not necessary for what you are doing but it's how you'd normally do
>> it
>> in a relational database, so if you ever needed to turn your file based
>> program into a full blown database then using IDs would actually help!
>>
>> The other thing you could do is hold all the data for a single student
>> in one structure. Thus instead of having lots of lists all linked by
>> a common index (or ID) you have one collection of students (probably
>> a dictionary keyed by name) each with all of its own data. This
>> involves a more complex data structure and is a move in the direction
>> of object oriented programming but without actual classes and objects
>> being involved. This might also allow you to use the shelve moduile
>> to save/restore your data to file easily.
>>
>> Just a thought,
>>
>> Alan G.
>>
> _______________________________________________
> Tutor maillist - Tutor@python.org
> http://mail.python.org/mailman/listinfo/tutor
>
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