I don't quite understand this error...

[Alexander Orchard]

I'm trying to create a simple accounting system based off of an example GUI.
The coding is as follows:

#!/usr/bin/python

from Tkinter import *
from os import urandom
from twisted.internet import tksupport
from twisted.internet import reactor
from accounts import accountlist

def whichSelected () :
    print "At %s of %d" % (select.curselection(), len(accountlist))
    return int(select.curselection()[0])

def addEntry () :
    accountlist.append ([userVar.get(), passwVar.get(), balanceVar.get()])
    setSelect ()

def Withdrawl() :
    user, passw, balance = accountlist[whichSelected()]
    userVar.set(user)
    passwVar.set(passw)
    balanceVar.set(balance)
    balanceVar -= amount
    balance.set(balanceVar)
    setSelect ()

def Deposit() :
    user, passw, balance = accountlist[whichSelected()]
    balance += amount
    accountlist[whichSelected()] = [user, passw, balance]
    setSelect ()

def loadEntry  () :
    user, passw, balance = accountlist[whichSelected()]
    userVar.set(user)
    passwVar.set(passw)
    balanceVar.set(balance)


def makeWindow () :
    global userVar, passwVar, balanceVar, amount, select
    win = Tk()

    frame1 = Frame(win)
    frame1.pack()

    Label(frame1, text="User Name").grid(row=0, column=0, sticky=W)
    userVar = StringVar()
    user = Entry(frame1, textvariable=userVar)
    user.grid(row=0, column=1, sticky=W)

    Label(frame1, text="Password").grid(row=1, column=0, sticky=W)
    passwVar= StringVar()
    passw= Entry(frame1, textvariable=passwVar)
    passw.grid(row=1, column=1, sticky=W)

    Label(frame1, text="Balance ($)").grid(row=2, column=0, sticky=W)
    balanceVar= IntVar()
    balance= Entry(frame1, textvariable=balanceVar)
    balance.grid(row=2, column=1, sticky=W)

    frame2 = Frame(win)
    frame2.pack()
    b1 = Button(frame2,text=" Add  ",command=addEntry)
    b2 = Button(frame2,text="Withdraw Amount",command=Withdrawl)
    b3 = Button(frame2,text="Deposit Amount",command=Deposit)
    b4 = Button(frame2,text=" Load ",command=loadEntry)
    b1.pack(side=LEFT); b2.pack(side=LEFT)
    b3.pack(side=LEFT); b4.pack(side=LEFT)

    frame3 = Frame(win)
    frame3.pack()
    scroll = Scrollbar(frame3, orient=VERTICAL)
    select = Listbox(frame3, yscrollcommand=scroll.set, height=6)
    scroll.config (command=select.yview)
    scroll.pack(side=RIGHT, fill=Y)
    select.pack(side=LEFT,  fill=BOTH, expand=1)

    frame4 = Frame(win)
    frame4.pack()

    Label(frame4, text="Amount ($)").grid(row=0, column=0, sticky=W)
    amountVar= IntVar()
    amount= Entry(frame4, textvariable=amountVar)
    amount.grid(row=0, column=1, sticky=W)
    return win

def setSelect () :
    accountlist.sort()
    select.delete(0,END)
    for user,passw,balance in accountlist :
        select.insert (END, user)


# Install the Reactor support
def main():
    root = makeWindow()
    setSelect ()
    tksupport.install(root)
#    root.pack()
    print "starting event loop"
    reactor.run()

#if __name__ == "__main__":
main()




Also, for reference, the "accounts" imported from are as follows:

accountlist = [
  ['Alex',  'shera', '400'],
  ['Sam',  'tish', '0']
]





Thus far, everything works fine unless I'm trying the Deposit or Withdrawal
functions. (I know they're different, but both give roughly the same error.)
Whenever I attempt one of these functions I get the following error message:


Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Python24\lib\lib-tk\Tkinter.py", line 1345, in __call__
    return self.func(*args)
  File "C:\Python24\AEOpaypal.py", line 27, in Deposit
    user, passw, balance = accountlist[whichSelected()]
  File "C:\Python24\AEOpaypal.py", line 11, in whichSelected
    return int(select.curselection()[0])
IndexError: tuple index out of range


I honestly don't understand what's going on... I've managed to stumble my
way through understanding what error messages mean, but I'm not sure what do
here. Just to clarify, to deposit money, first you select the account, and
click "Load" to bring it up on screen. Then you put the amount in the
"Amount" text box. Then you click "Deposit Amount"

Thanks in advance!
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