我在将一个类实例中定义的变量传递到另一个类实例时遇到问题。我对使用类比较陌生，但据我所知，变量可以通过简单地定义为类实例的一部分(例如在下面的示例中)从一个实例传递到另一个实例。虽然我以前使用过这个模型，但我从未尝试过使用像wxPython这样的GUI框架来实现这一点。class Foo(object):

def __init__(self, var):

self.var = var

class Bar(object):

def do_something(self, var):

print var*3

if __name__ == '__main__':

f = Foo(3)

b = Bar()

b.do_something(f.var)

我遇到的问题是wxPython实例似乎是预定义的，不接受任何附加参数(允许我只向类实例传递标题、大小等内容)。

我面临的另一个问题是，我试图通过调用一个对话框窗口来深入传递变量三个类，并从对话框中调用一个单独的类来启动一个工作线程。

所以我的问题是：如何将变量从一级实例传递到三级实例？

如何重写wxPython实例以允许定义其他变量？

或者，是否可以创建自定义事件处理程序来传递必要的数据？

澄清。。。

我正在使用Python，我想我理解使用类和带有Tkinter和wxPython(在这个项目中使用)框架的GUI编程的基本原理。我已经编写了一个从用户那里获取一些数据的主类/实例，我希望能够传递self.main_instance_var中存储的信息，并将其传递给第二个类/实例(在本例中，是从第一个类调用的进度对话框窗口)。

当我试图在进度对话框中使用上述模型时，出现了一个非常不格式化的语法错误(“关键字arg之后是非关键字arg”)。阻止我进一步将变量从“进度”对话框窗口传递到工作线程。如果我得到一个异常，那将是一件事，但语法错误我不明白。下面是一个简短的例子：class ProgressDialog(wx.Dialog):

def __init__(self, parent, title, myVar): # Generates syntax error on this line

super(ProgressDialog, self).__init__(parent=parent,

title=title, size=(500, 110))

self.var = myVar

基本来源(按要求，很抱歉这么脏)：import time

import os, sys, wx

from ftplib import FTP_TLS

from threading import Thread

from wx.lib.pubsub import Publisher

########################################################################

class FtpValues(object):

""" Returns a property attribute - called by FtpFileTransfer

Used to set values/variables for Host, USERID, PASSWD, FILE """

#----------------------------------------------------------------------

def __init__(self):

self.varList = None

#----------------------------------------------------------------------

def GetValues(self):

return self.varList

#----------------------------------------------------------------------

def SetValues(self, HOST, USERID, PASSWD, FILE):

self.varList = [HOST, USERID, PASSWD, FILE]

#----------------------------------------------------------------------

def DelValues(self):

del self.valList

Values = property(GetValues, SetValues, DelValues, "Set/Get FtpValues")

# http://docs.python.org/library/functions.html#property

########################################################################

class FtpFileTransfer(Thread):

"""Test Worker Thread Class."""

#----------------------------------------------------------------------

def __init__(self):

"""Init Worker Thread Class."""

Thread.__init__(self)

self.StartTransfer() # start the thread

#----------------------------------------------------------------------

def StartTransfer(self): # was named run - started automatically

"""Run Worker Thread.""" # when called by the start method

# This is the code executing in the new thread.

HOST, USERID, PASSWD, FILE = FtpValues.Values

BLOCKSIZE = 57344

try:

ftp = FTP_TLS(HOST)

ftp.login(USERID, PASSWD)

ftp.prot_p()

ftp.voidcmd("TYPE I")

f = open(FILE, 'rb')

datasock, esize = ftp.ntransfercmd(

'STOR %s' % os.path.basename(FILE))

size = os.stat(FILE)[6]

bytes_so_far = 0

while 1:

buf = f.read(BLOCKSIZE)

if not buf:

break

datasock.sendall(buf)

bytes_so_far += len(buf)

msg = [bytes_so_far, size]

Publisher().sendMessage("update", msg)

except: raise

finally:

try:

datasock.close()

f.close()

ftp.voidresp()

ftp.quit()

print 'Complete...'

except: pass

wx.CallAfter(Publisher().sendMessage, "update", "Database Transfer Complete!")

########################################################################

class ProgressDialog(wx.Dialog):

def __init__(self, parent, title):

super(ProgressDialog, self).__init__(parent=parent,

title=title, size=(500, 110))

self.displayLbl = wx.StaticText(self, -1, 'Verifying Database Files... ', (20, 20)) #Preparing for Transfer...

self.gauge = wx.Gauge(self, -1, 100, (20, 45), (370, 24))

self.btn = btn = wx.Button(self, -1, 'Cancel', (400, 45), (-1, 25))

btn.Bind(wx.EVT_BUTTON, self.OnClose)

# listens for response from worker thread

Publisher().subscribe(self.updateDisplay, "update")

FtpFileTransfer()#.StartTransfer(HOST, USERID, PASSWD, FILE) #Start the FTP Worker Thread

#self.OnStart()

#----------------------------------------------------------------------

def run(self):

FtpFileTransfer(HOST, USERID, PASSWD, FILE)

#----------------------------------------------------------------------

def OnClose(self, event):

""" Place Holder """

if self.btn.GetLabel() == 'Finish':

# Do Something!

pass

return None

#----------------------------------------------------------------------

def updateDisplay(self, msg):

""" Receives data from thread and updates the display """

if isinstance(msg.data, list):

bytes_so_far, size = msg.data

k = 100 * bytes_so_far / size

self.displayLbl.SetLabel("Sent %d of %d bytes %.1f%%" % (bytes_so_far, size, 100 * bytes_so_far / size))

self.gauge.SetValue(k)

else:

self.displayLbl.SetLabel("%s" % msg.data)

#self.btn.Enable()

self.btn.SetLabel('Finish')

########################################################################

class MyForm(wx.Frame):

#----------------------------------------------------------------------

def __init__(self):

wx.Frame.__init__(self, None, wx.ID_ANY, "Tutorial")

# Add a panel so it looks the correct on all platforms

panel = wx.Panel(self, wx.ID_ANY)

self.displayLbl = wx.StaticText(panel, label="Amount of time since thread started goes here")

self.btn = btn = wx.Button(panel, label="Start Thread")

self.gauge = wx.Gauge(panel, -1, 100, size=(370, 24))

btn.Bind(wx.EVT_BUTTON, self.onButton)

sizer = wx.BoxSizer(wx.VERTICAL)

sizer.Add(self.displayLbl, 0, wx.ALL|wx.CENTER, 5)

sizer.Add(btn, 0, wx.ALL|wx.CENTER, 5)

sizer.Add(self.gauge, 0, wx.ALL|wx.CENTER, 5)

panel.SetSizer(sizer)

self.VarData()

# create a pubsub receiver

Publisher().subscribe(self.updateDisplay, "update")

#----------------------------------------------------------------------

def onButton(self, event):

"""

Runs the thread

"""

chgdep = ProgressDialog(None, title='File Transfer. . .')

chgdep.ShowModal()

#chgdep.Destroy()

#----------------------------------------------------------------------

def updateDisplay(self, msg):

"""

Receives data from thread and updates the display

"""

if isinstance(msg.data, list):

bytes_so_far, size = msg.data

k = 100 * bytes_so_far / size

self.displayLbl.SetLabel("Sent %d of %d bytes %.1f%%" % (bytes_so_far, size, 100 * bytes_so_far / size))

self.gauge.SetValue(k)

else:

self.displayLbl.SetLabel("%s" % msg.data)

self.btn.Enable()

#----------------------------------------------------------------------

def VarData(self):

HOST = '127.0.0.1'

USERID = 'test'

PASSWD = 'P@ssw0rd'

FILE = r'F:\Programming\temp\Test.zip'

varList = [HOST, USERID, PASSWD, FILE]

FtpValues.Values = HOST, USERID, PASSWD, FILE

#----------------------------------------------------------------------

# Run the program

if __name__ == "__main__":

app = wx.PySimpleApp()

frame = MyForm().Show()

app.MainLoop()