Slightly modified version:

# Core-satellite strategy v2  
# ---------------------------------------------------------------------------------  
core_etf, proportion = symbols('QQQ', 'XLP', 'TLT', 'IEF'), [0.25, 0.25, 0.25, 0.25]  
tact_etf, ma_s, ma_f = symbols('XLV', 'XLY', 'TLO', 'GLD'), 200, 20  
lev, wt_core = 1.0, 0.25  
# ---------------------------------------------------------------------------------  
def initialize(context):  
     schedule_function(trade, date_rules.week_start(2), time_rules.market_open(minutes=65)) 

def trade(context,data):  
    if get_open_orders(): return 

    for i in range(len(core_etf)):  
        if data.can_trade(core_etf[i]):  
            order_target_percent(core_etf[i], lev*wt_core*proportion[i])

    ma_fast = data.history(tact_etf, 'price', ma_f, '1d').mean()  
    ma_slow = data.history(tact_etf, 'price', ma_s, '1d').mean()  
    ratio   = ma_fast/ma_slow  
    pos_mom = ratio[ratio >= 1.0]  
    wt      = lev*(1.0 - wt_core) / len(pos_mom) if len(pos_mom) !=0 else 0

    for etf in tact_etf:  
        if data.can_trade(etf):  
            if etf in pos_mom.index:  
                order_target_percent(etf, wt)  
            else:  
                order_target(etf, 0)  

def before_trading_start(context,data):  
    record(leverage = context.account.leverage)  

Total Returns
205.2%
Benchmark Returns
90.5%
Alpha
0.10
Beta
0.16
Sharpe
1.21
Sortino
1.77
Volatility
0.10
Max Drawdown
-13.6%

You should comment your code. But nice read anyway