在新的控制台窗口中打开Python线程

Question

我正在尝试创建一个程序,它将启动视图窗口(控制台)和命令行.在视图窗口中,它将显示常量更新,而命令行窗口将用于raw_input()接受影响视图窗口的命令.我正在考虑使用线程,但我不知道如何在新的控制台窗口中启动线程.我该怎么办？

Answer 1

我同意@stark GUI的方式.

纯粹为了说明这里是一个不推荐的非GUI方式,它显示了如何使用线程,子进程和命名管道作为IPC.

有两个脚本:

• entry.py:接受来自用户的命令,对命令执行某些操作,将其传递给命令行中给出的命名管道:

  #!/usr/bin/env python
  import sys
  
  print 'entry console'
  with open(sys.argv[1], 'w') as file:
      for command in iter(lambda: raw_input('>>> '), ''):
          print ''.join(reversed(command)) # do something with it
          print >>file, command # pass the command to view window
          file.flush()
  

• view.py:启动入口控制台,在线程中打印常量更新,接受来自命名管道的输入并将其传递给更新线程:

  #!/usr/bin/env python
  import os
  import subprocess
  import sys
  import tempfile
  from Queue import Queue, Empty
  from threading import Thread
  
  def launch_entry_console(named_pipe):
      if os.name == 'nt': # or use sys.platform for more specific names
          console = ['cmd.exe', '/c'] # or something
      else:
          console = ['xterm', '-e'] # specify your favorite terminal
                                    # emulator here
  
      cmd = ['python', 'entry.py', named_pipe]
      return subprocess.Popen(console + cmd)
  
  def print_updates(queue):
      value = queue.get() # wait until value is available
  
      msg = ""
      while True:
          for c in "/-\|":
              minwidth = len(msg) # make sure previous output is overwritten
              msg = "\r%s %s" % (c, value)
              sys.stdout.write(msg.ljust(minwidth))
              sys.stdout.flush()
  
              try:
                  value = queue.get(timeout=.1) # update value
                  print
              except Empty:
                  pass
  
  print 'view console'
  # launch updates thread
  q = Queue(maxsize=1) # use queue to communicate with the thread
  t = Thread(target=print_updates, args=(q,))
  t.daemon = True # die with the program
  t.start()
  
  # create named pipe to communicate with the entry console
  dirname = tempfile.mkdtemp()
  named_pipe = os.path.join(dirname, 'named_pipe')
  os.mkfifo(named_pipe) #note: there should be an analog on Windows
  try:
      p = launch_entry_console(named_pipe)
      # accept input from the entry console
      with open(named_pipe) as file:
          for line in iter(file.readline, ''):
              # pass it to 'print_updates' thread
              q.put(line.strip()) # block until the value is retrieved
      p.wait()
  finally:
      os.unlink(named_pipe)
      os.rmdir(dirname)
  

要试用它,请运行:

$ python view.py

Answer 2

而不是使用控制台或终端窗口,重新检查您的问题.您要做的是创建一个GUI.有许多跨平台的工具包,包括Wx和Tkinter,它们都有小部件可以完全按照你的需要做.用于输出的文本框和用于读取键盘输入的条目小部件.另外,你可以将它们包装在一个漂亮的框架中,包括标题,帮助,打开/保存/关闭等.