Wxpython grid AppendRows - grid

Question

The following code is used to generate a table that an row can be added by a button, but only the data of the last row is eliminated after running.
import wx, wx.grid
class GridData(wx.grid.PyGridTableBase):
_cols = "a b c".split()
_data = [
"1 2 3".split(),
"4 5 6".split(),
"7 8 9".split()
]
_highlighted = set()
def GetColLabelValue(self, col):
return self._cols[col]
def GetNumberRows(self):
return len(self._data)
def GetNumberCols(self):
return len(self._cols)
def GetValue(self, row, col):
return self._data[row][col]
def SetValue(self, row, col, val):
self._data[row][col] = val
def AppendRows(self, *args):
msg = wx.grid.GridTableMessage(self,
wx.grid.GRIDTABLE_NOTIFY_ROWS_APPENDED,
)
self.GetView().ProcessTableMessage(msg)
return True
# self.GetView().EndBatch()
# msg = wx.grid.GridTableMessage(self, wx.grid.GRIDTABLE_REQUEST_VIEW_GET_VALUES)
# self.GetView().ProcessTableMessage(msg)
def GetAttr(self, row, col, kind):
attr = wx.grid.GridCellAttr()
attr.SetBackgroundColour(wx.GREEN if row in self._highlighted else wx.WHITE)
return attr
def set_value(self, row, col, val):
self._highlighted.add(row)
self.SetValue(row, col, val)
class Test(wx.Frame):#main frame
def __init__(self):
wx.Frame.__init__(self, None)
self.data = GridData()
self.grid = wx.grid.Grid(self)
self.grid.SetTable(self.data)
btn = wx.Button(self, label="set a2 to x")
btn.Bind(wx.EVT_BUTTON, self.OnTest)
self.Sizer = wx.BoxSizer(wx.VERTICAL)
self.Sizer.Add(self.grid, 1, wx.EXPAND)
self.Sizer.Add(btn, 0, wx.EXPAND)
def OnTest(self, event):
self.grid.AppendRows(numRows=3)
#self.data.set_value(1, 0, "x")
self.grid.Refresh()
app = wx.PySimpleApp()
app.TopWindow = Test()
app.TopWindow.Show()
app.MainLoop()
There is no error report,and the expectation can't be reached.
The following code is used to generate a table that can be added by a button, but only the data of the last row can be eliminated after running.