在继续之前，如何完成Python子流程？

Question

此脚本在复制文件夹时创建进度条。 我需要弄清楚如何在脚本继续之前完成copyObjFile函数（并显示“Done！”消息）。但是，在复制操作完成之前，当前将显示“完成！”消息。我怎样才能让它等待

import sys
import os
import subprocess
from PySide2 import QtGui, QtCore, QtWidgets

class FileCopyProgress(QtWidgets.QWidget):
   def __init__(self, src=None, dest=None):
      super(FileCopyProgress, self).__init__()
      self.src = src
      self.dest = dest
      self.build_ui()

   def build_ui(self):
      hbox = QtWidgets.QVBoxLayout()
      self.pb = QtWidgets.QProgressBar()
      self.pb.setMinimum(0)
      self.pb.setMaximum(100)
      self.pb.setValue(0)

      hbox.addWidget(self.pb)
      self.setLayout(hbox)
      self.setWindowTitle('File copy')

      self.auto_start_timer = QtCore.QTimer()
      self.auto_start_timer.timeout.connect(lambda: self.copyfileobj(src=self.src, dst=self.dest, callback_progress=self.progress, callback_copydone=self.copydone))
      self.auto_start_timer.start(2000)
      self.show()

   def progress(self, curr, tot):
      percentage = int((float(curr) / float(tot)) * 100)
      self.pb.setValue(percentage)
      app = QtWidgets.QApplication.instance()
      app.processEvents()

   def copydone(self):
      self.pb.setValue(100)
      self.close()

   def copyfileobj(self, src, dst, callback_progress, callback_copydone, length=8*1024):
      numFiles_total = 0
      for root, dirs, files in os.walk(src):
         numFiles_total += len(files)
      self.auto_start_timer.stop()
      # COPY FILE
      p = subprocess.Popen(['robocopy', src, dst, '/E', '/MT:16'], shell=True, stdout=subprocess.PIPE)
      numFiles_curr = 0
      while True:
         line = p.stdout.readline()
         if not line:
            break
         myLine = line.strip()
         if '%' in myLine:
            numFiles_curr += 1
            print('Progress: ' + str(numFiles_curr) + '/' + str(numFiles_total))
            callback_progress(curr=numFiles_curr, tot=numFiles_total)
         sys.stdout.flush()
      callback_copydone()

class Window(QtWidgets.QDialog):
   def __init__(self):
      super(Window, self).__init__()
      self.initUI()

   def initUI(self):
      vlayout_base = QtWidgets.QVBoxLayout()
      self.setLayout(vlayout_base)
      button = QtWidgets.QPushButton('Copy File')
      button.clicked.connect(self.doStuff)
      vlayout_base.addWidget(button)

   def doStuff(self):
      self.copyFile()
      self.messageDialog('Done!', 'message')

   def copyFile(self):
      source = r'/Users/asdf/Downloads'
      destination = r'/Users/asdf/Temp'
      ex = FileCopyProgress(src=source, dest=destination)

   def messageDialog(self, msgText, windowTitle=None):
      # SHOW MESSAGE BOX
      msgBox = QtWidgets.QMessageBox()
      msgBox.setModal = True
      if windowTitle:
         msgBox.setWindowTitle(windowTitle)
      msgBox.setText(msgText)
      msgBox.exec_()

def main():
   app = QtWidgets.QApplication(sys.argv)
   w = Window()
   w.show()
   sys.exit(app.exec_())

if __name__ == '__main__':
   main()

Answer 1

看起来您缺少一个^{}：

# in: copyfileobj definition

p = subprocess.Popen(['robocopy', src, dst, '/E', '/MT:16'], shell=True, stdout=subprocess.PIPE)

status = p.wait()