This code can successfully run multiple sids but cannot run with only one. If I do this I get a runtime error on line 22.The error says:

There was a runtime error.
TypeError: 'zipline.assets._assets.Equity' object is not iterable
User Algorithm: 22, in handleData
for stock in context.stocks:

Here is the code:

# Put any initialization logic here.  The context object will be passed to  
# the other methods in your algorithm.  
def initialize(context):  
    context.stocks = sid(24)  
    # context.stocks = sid(24), sid(46631), sid(5061), sid(6683), sid(45815), sid(3149), sid(49209), sid(42950), sid(41579), sid(4589), sid(45971), sid(28016), sid(20133), sid(8554), sid(698)  
    # PNRA  
    schedule_function(  
        func=handleData,  
        date_rule=date_rules.every_day(),  
        time_rule=time_rules.market_open(hours=0, minutes=1),  
        half_days=True  
    )

# Will be called on every trade event for the securities you specify.  
def handle_data(context,data):  
    pass

def handleData(context, data):  
    print(context.stocks)  
    for stock in context.stocks:  
        if stock in data:  
            print(data)  
            MA1 = data[stock].mavg(50)  
            MA2 = data[stock].mavg(100)  
            current_price = data[stock].price  
            current_positions = context.portfolio.positions[stock].amount  
            cash = context.portfolio.cash  
            if (MA1 > MA2) and current_positions == 0:  
                number_of_shares = int(cash/current_price)  
                order(stock, number_of_shares)  
                log.info("buying shares")  
            elif (MA1 < MA2) and current_positions != 0:  
                order_target(stock, 0)  
                log.info("selling shares")  
            record(MA1 = MA1, MA2 = MA2, Price = current_price)  
            return  

Please note that handleData is not the same as handle_data. Does anyone know where I have gone wrong?

Thanks,
Nick