spent

rate = [ 800, 750, 700]
amount = [ 1, 0.5, 0.1]

def main():
    global spent, si
    spent = [] #load from file
    si = 0

    addspent(rate[0], amount[0])
    addspent(rate[1], amount[1])
    addspent(rate[2], amount[2])

    #print spent[si][0] #rate
    #print spent[si][1] #amount

    print spent[0]
    print spent[1]
    print spent[2]


def addspent(rate, amount):
    global spent, si
    spent.append([])
    spent[si].append(rate)
    spent[si].append(amount)
    si += 1

main()