ValueError:在使用os.popen().read()时嵌入空字节

Question

我想给罗菲打几行图标，但我搞错了，我不明白为什么

def show_podcasts(f):
    podcasts_list = ""
    with open(f,"r") as podcasts:
        for line in podcasts:
            episode_title = " ".join(line.split(" ")[:-2])
            found = False
            for pic in os.listdir("images"):
                if os.path.isfile(os.path.join("images",pic)):
                    if pic.startswith(episode_title):
                        found = True
                        podcasts_list += episode_title + "\x00icon\x1f" + pic + "\n"
            if not found:
                podcasts_list += episode_title + "\n"
    print(podcasts_list)
    selected_podcast = os.popen("(cat << EOF\n" + podcasts_list + "EOF\n)| rofi -dmenu -p 'enter the podcast you are looking for'").read()

这就是错误

Traceback (most recent call last):
  File "/home/javier/ssd/dev/python/pod-rofi/main.py", line 91, in <module>
    main()
  File "/home/javier/ssd/dev/python/pod-rofi/main.py", line 84, in main
    show_podcasts("podcasts")
  File "/home/javier/ssd/dev/python/pod-rofi/main.py", line 77, in show_podcasts
    selected_podcast = os.popen("(cat << EOF\n" + podcasts_list + "EOF\n)| rofi -dmenu -p 'enter the podcast you are looking for'").read()
  File "/usr/lib/python3.10/os.py", line 985, in popen
    proc = subprocess.Popen(cmd,
  File "/usr/lib/python3.10/subprocess.py", line 966, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/usr/lib/python3.10/subprocess.py", line 1775, in _execute_child
    self.pid = _posixsubprocess.fork_exec(
ValueError: embedded null byte

Answer 1

我不明白你到底想做什么，但希望我能解释一下错误。

运行程序涉及系统调用，接口遵循C语言规则，即字符串(在本例中为命令)以空字节结束。该规则意味着空字节不能是字符之一。

但是这里将插入空字节：

podcasts_list += episode_title + "\x00icon\x1f" + ....
#                                 ^^^^