买入前100万,买入02318.HK 10000股 45.8, 买入后可用资金97万,怎么回事?

附回测片段代码:
# 买入前,可用资金查询
acct_info = get_trade_detail_data('6000000248', 'stock', 'account')
for i in acct_info:
print('买入前可用资金',i.m_dAvailable)
print(bar_day, '全仓买入:',symbol_2, price_2,10000)
passorder(23,1101,ContextInfo.accID,symbol_2,5,0, 10000, ContextInfo)
buy_condition = True
# 买入后,可用资金查询
acct_info = get_trade_detail_data('6000000248', 'stock', 'account')
for i in acct_info:
print('买入后可用资金',i.m_dAvailable)
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