我正在尝试制作一个程序,该程序将同时启动查看窗口(控制台)和命令行。在视图窗口中,它将显示不断的更新,而命令行窗口将用于raw_input()接受影响视图窗口的命令。我正在考虑为此使用线程,但是我不知道如何在新的控制台窗口中启动线程。我该怎么办?
raw_input()
重新检查您的问题,而不是使用控制台或终端窗口。您试图做的是创建一个GUI。有许多跨平台的工具包,包括Wx和Tkinter,它们的小部件可以完全满足您的需求。用于输出的文本框和用于读取键盘输入的输入小部件。另外,您可以将它们包装在带有标题,帮助,打开/保存/关闭等的漂亮框架中。
我同意@stark的GUI是这样的。
纯粹出于说明目的,这是一种不建议使用的非GUI方式,该方式显示了如何使用线程,子进程和命名管道(如IPC)来执行此操作。
有两个脚本:
entry.py:接受用户的命令,对命令进行处理,然后将其传递给命令行中指定的命名管道:
entry.py
#!/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)
要尝试,请运行:
$ python view.py