i made right set, but there is key error in gurobipy

I made linear program model in gurobipy like this

def cal_gl_1():
    m = gp.Model('Inventory')
    s=['AUC','ADU','CF','LT']  #AUC: average unit cost, ADU: annual dollar usage, CF: critical factor, LT: lead time
    item_number=list(range(1,11))
    def cal_s_1():
        s_auc=[71.21, 58.45, 40.82, 19.86, 86.50, 71.2, 78.4, 51.68, 14.66, 72]   
        list_key = [('AUC',1),('AUC',2),('AUC',3),('AUC',4),('AUC',5),('AUC',6),('AUC',7),
        ('AUC',8),('AUC',9),('AUC',10)]
        auc=dict(zip(list_key,s_auc))
        return auc
    Lj = m.addVars(item_number,lb=0, name ="lamda" )
    ACU=cal_s_1()
    for r in s[0]:
       m.addConstrs(gp.quicksum(Lj[j]*ACU[r,j])>=ACU[r,j] for j in item_number)

       obj=(Lj[j].sum(j,'*') for j in item_number)
       m.setObjective(obj, GRB.MINIMIZE)
       m.optimize()
       data_all.append(m.objVal)
    return data_all

However there is keyerror.

KeyError: ('A', 1)

I think there right key ('AUC',1)...('AUC',10). I don't know which is wrong.

The problem is probably here:

for r in s[0]:

Try:

for r in s:

Else r will be ['A', 'U', 'C'] and not ['AUC','ADU','CF','LT'].

But maybe you want to constraints only for 'AUC'. In this case, use:

for r in ['AUC']:

or r = 'AUC' without loop.