How to add scroll bars to windows in wxpython

my program has set up two identical grid tables, but I can only see one without a scroll bar. I saw it set with Boxsizer on the Internet, but after trying it, it made the gird window so small that I couldn"t see a table clearly. Here is the code

-sharp-*- encoding:UTF-8 -*-
import wx
import wx.grid
class TestTable(wx.grid.PyGridTableBase):-sharp
    def __init__(self):
        wx.grid.PyGridTableBase.__init__(self)
        self.data = { (1,1) : "Here",
        (2,2) : "is",
        (3,3) : "some",
        (4,4) : "data",
        }
        self.odd=wx.grid.GridCellAttr()
        self.odd.SetBackgroundColour("sky blue")
        self.odd.SetFont(wx.Font(10, wx.SWISS, wx.NORMAL, wx.BOLD))
        self.even=wx.grid.GridCellAttr()
        self.even.SetBackgroundColour("sea green")
        self.even.SetFont(wx.Font(10, wx.SWISS, wx.NORMAL, wx.BOLD))
    -sharp these five are the required methods
    def GetNumberRows(self):
        return 50
    def GetNumberCols(self):
        return 50
    def IsEmptyCell(self, row, col):
        return self.data.get((row, col)) is not None
    def GetValue(self, row, col):-sharp
        value = self.data.get((row, col))
        if value is not None:
            return value
        else:
            return ""
    def SetValue(self, row, col, value):-sharp
        self.data[(row,col)] = value
    -sharp -sharp the table can also provide the attribute for each cell
    def GetAttr(self, row, col, kind):
        attr = [self.even, self.odd][row % 2]
        attr.IncRef()
        return attr
class TestFrame(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, title="Grid Table",
        size=(640,480))
        grid = wx.grid.Grid(self)
        -sharpgrid
        table = TestTable()
        grid.SetTable(table, True)
        -sharp grid
        le = TestTable()
        grid.SetTable(le, True)
app = wx.PySimpleApp()
frame = TestFrame()
frame.Show()
Mar.28,2021
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