我已经输出了类似下面的内容，有人可以帮我阅读特定符号的lot_size吗？
20188 Instrument(exchange='NSE_EQ', token=20188, parent_token=None, symbol='wabag', name='VA TECH WABAG LTD', closing_price=320.45, expiry=None, strike_price=None, tick_size=5.0, lot_size=1, instrument_type='EQUITY', isin='INE956G01038')
16915 Instrument(exchange='NSE_EQ', token=16915, parent_token=None, symbol='wabcoindia', name='WABCO INDIA LIMITED', closing_price=6121.75, expiry=None, strike_price=None, tick_size=5.0, lot_size=1, instrument_type='EQUITY', isin='INE342J01019')
3736 Instrument(exchange='NSE_EQ', token=3736, parent_token=None, symbol='walchannag', name='WALCHANDNAGAR INDUSTRIES', closing_price=86.75, expiry=None, strike_price=None, tick_size=5.0, lot_size=1, instrument_type='EQUITY', isin='INE711A01022')
contract = u.get_master_contract('NSE_FO')
for key,value in contract.items():
print(key,value)
contract = u.get_master_contract('NSE_FO')
for key,value in contract.items():
print(key,value)
如果instrument_type ='FUTSTK'，我如何获得交易品种lot_size？