libstdc++.so.6: version `GLIBCXX_3.4.21' not found 问题解决
我在安装vn.py时报如下错误:andy@andy:~/vnpy/examples/VnTrader$pythonrun.pyTraceback(mostrecentcalllast):File"run.py",line19,infromvnpy.trader.gatewayimport(ctpGateway,oandaGateway,ibGateway,File"/home/andy/anaco