Using a Loop to add objects to a list(python)

Question

I'm trying to use a while loop to add objects to a list.

Here's basically what I want to do:

class x:
     pass

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))))

I can get the object added to the list, but I am stuck at how to add multiple objects to the list in the loop.

Here is the 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!

haha i tried to but i got the damn error message page with the LOLcat — Will
– Will, Commented Apr 18, 2010 at 18:39

Mark Byers · Accepted Answer · 2010-04-18 18:34:45Z

32

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)

answered Apr 18, 2010 at 18:34

Mark Byers

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8 Comments

Will Over a year ago

so outside the loop i should have a=[] and then inside the loop i should have a.append(s)?

Mark Byers Over a year ago

@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?

Will Over a year ago

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 Over a year ago

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?

Mark Byers Over a year ago

@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.

|

111 · Accepted Answer · 2015-08-11 19:08:45Z

0

Auto-incrementing the index in a loop:

myArr[(len(myArr)+1)]={"key":"val"}

edited Aug 11, 2015 at 19:08

answered Aug 4, 2015 at 20:07

111

1,9281 gold badge26 silver badges38 bronze badges

1 Comment

ParSa Over a year ago

not working ! IndexError: list assignment index out of range

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