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up vote 2 down vote favorite

Hey guys so im trying to use a while loop to add objects to a list.

Heres bascially what i want to do: (ill paste actually go after)

class x:
     blah
     blah

choice = raw_input(pick what you want to do)

while(choice!=0):
    if(choice==1):
       Enter in info for the class:
       append object to list (A)
    if(choice==2):
       print out length of list(A)
    if(choice==0):
       break
    ((((other options))))

as im doing this i can get the object to get added to the list, but i am stuck as to how to add multiple objects to the list in the loop.

Here is my actual code i have so far...

print "Welcome to the Student Management Program"

class Student:  
    def __init__ (self, name, age, gender, favclass):  
         self.name   = name  
         self.age    = age  
         self.gender = gender  
         self.fac = favclass  

choice = int(raw_input("Make a Choice: " ))

while (choice !=0):
    if (choice==1):  
        print("STUDENT")  
        namer = raw_input("Enter Name: ")  
        ager = raw_input("Enter Age: ")  
        sexer = raw_input("Enter Sex: ")  
        faver = raw_input("Enter Fav: ")      

    elif(choice==2):
        print "TESTING LINE"
    elif(choice==3):
        print(len(a))

    guess=int(raw_input("Make a Choice: "))

    s = Student(namer, ager, sexer, faver)
    a =[];
    a.append(s)

raw_input("Press enter to exit")

any help would be greatly appreciated!

share|improve this question
all variables named guess should be named choice my mistake – Will Apr 18 '10 at 18:34
You can edit your question ;) – Felix Kling Apr 18 '10 at 18:38
haha i tried to but i got the damn error message page with the LOLcat – Will Apr 18 '10 at 18:39
Did it for you... – Felix Kling Apr 18 '10 at 20:52

1 Answer

up vote 4 down vote

The problem appears to be that you are reinitializing the list to an empty list in each iteration:

while choice != 0:
    ...
    a = []
    a.append(s)

Try moving the initialization above the loop so that it is executed only once.

a = []
while choice != 0:
    ...
    a.append(s)
share|improve this answer
so outside the loop i should have a=[] and then inside the loop i should have a.append(s)? – Will Apr 18 '10 at 18:37
@Will: That is probably a good start, although there are some other issues with your code. If you enter a number other than 0 or 1 you will add the same student to the list again. Is this really what you want? – Mark Byers Apr 18 '10 at 18:40
haha and um no....i want the ability to go through the loop and add a different student each time i choose 1... so i would go through once, add a student, choose 1 again and add a different student...etc...etc so each time i go through i can add a diff student – Will Apr 18 '10 at 18:42
but at the end of the loop iw ould have the user enter in new information for the student class so wouldnt that take the place of the old info? – Will Apr 18 '10 at 18:47
@Will: I would move the code that appends to the list to be inside the if choice == 1: block. It should not run in the other cases. – Mark Byers Apr 18 '10 at 18:48
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