各位大佬好，请教一个问题，我在vnpy.chart模块下修改k线图画法，现在想在k线上显示文字，并让文字大小需K的缩放动态变化，请问这个应该怎么实现，感谢/抱拳

请教各位一个问题。实盘tick只到14：59分，这样子就永远无法驱动合成最后一根K线，导致某些指标不能正确更新，请问下这个问题吗应该怎么解决呢？

打开vnpy后，选择CTA回测功能，显示如下错误信息，请问是pyqt5版本的问题吗？有人遇到过相似问题吗？希望大神给小白解惑，谢谢。
Traceback (most recent call last):
File "C:\Users\Administrator\Miniconda3\lib\site-packages\vnpy\trader\ui\mainwindow.py", line 278, in open_widget
widget = widget_class(self.main_engine, self.event_engine)
File "C:\Users\Administrator\Miniconda3\lib\site-packages\vnpy\app\cta_backtester\ui\widget.py", line 47, in init
self.init_ui()
File "C:\Users\Administrator\Miniconda3\lib\site-packages\vnpy\app\cta_backtester\ui\widget.py", line 208, in init_ui
self.candle_dialog = CandleChartDialog()
File "C:\Users\Administrator\Miniconda3\lib\site-packages\vnpy\app\cta_backtester\ui\widget.py", line 1109, in init
self.init_ui()
File "C:\Users\Administrator\Miniconda3\lib\site-packages\vnpy\app\cta_backtester\ui\widget.py", line 1119, in init_ui
self.chart.add_plot("volume", maximum_height=200)
File "C:\Users\Administrator\Miniconda3\lib\site-packages\vnpy\chart\widget.py", line 72, in add_plot
plot = pg.PlotItem(axisItems={'bottom': self._x_axis})
File "C:\Users\Administrator\Miniconda3\lib\site-packages\pyqtgraph\graphicsItems\PlotItem\PlotItem.py", line 158, in init
self.setAxisItems(axisItems)
File "C:\Users\Administrator\Miniconda3\lib\site-packages\pyqtgraph\graphicsItems\PlotItem\PlotItem.py", line 325, in setAxisItems
if axis != self.axes[k]["item"]:
KeyError: 'bottom'

各位大神，请问下价差套利怎么用遗传算法来做参数优化？