Pyqt使用QThread但GUI仍然没有响应

Question

我尝试将文件从FTP下载到网络共享文件夹（文件大小可能超过500mb）但每次单击“开始”时，即使使用QThread，GUI也会显示“无响应”

我做错了什么？

main.py

# -*- coding: utf-8 -*-
from PyQt4 import QtGui
import ftp100



class main_windows(QtGui.QWidget):
    def __init__(self):
        super(main_windows, self).__init__()
        self._count = 0
        self.Ftpallobject = []

    def init(self):

        #PASS SOME GUI CODE

        button_go = QtGui.QPushButton('GO')
        button_go.clicked.connect(self.Ftpstart)

        self.fp = ftp100.ftpmethod()
        self.fp.requestSignal_getinfo.connect(self.Ftpallobject)



    def SendFtpInfo(self):
        self.fp.update_getinfo.emit(self.allobject)

    def Ftpstart(self):
        self.fp.run()

ftp.py

# -*- coding: utf-8 -*-
from PyQt4 import QtCore
import ftputil

class ftpmethod(QtCore.QThread):
    requestSignal_getinfo = QtCore.pyqtSignal()
    update_getinfo = QtCore.pyqtSignal(list)

    def __init__(self, parent=None):
        super(ftpmethod, self).__init__(parent)
        self._count = 0
        self.ftpinfo = []
        self.update_getinfo.connect(self.getinfo)

    def run(self):
        self.requestSignal_getinfo.emit()
        while self._count<1:
            for i in self.ftpinfo:
                site = "".join(str(i[2].text()))
                account = "".join(str(i[0].text()))
                pwd = "".join(str(i[1].text()))
                filepath = "".join(str(i[3].text()))
                filename = "".join(str(i[4].text()))
                downloadtolocal = "".join(str(i[7].text()))+"".join(str(i[4].text()))
                print site,account,pwd,filepath,filename,downloadtolocal
                try:
                    with ftputil.FTPHost(site,account,pwd) as host:
                        if filepath=='':
                            host.download(filename,downloadtolocal)
                        else:
                            host.chdir(filepath)
                            host.download(filename,downloadtolocal)
                except:
                    print 'FTP ERROR'
            self._count+=1
        self._count=0

    def getinfo(self,info):
        self.ftpinfo = info