无法通过asyncio使用bash命令

Question

我试图做一个简单的命令，我可以调用不一致的命令，让我看到目录中有多少个文件，但由于某种原因，我的代码一旦运行命令：

`Traceback (most recent call last): 
    File "/home/pi/MusicToaster/musicbot/bot.py", line 1995, in on_message 
    response = await handler(**handler_kwargs) 
    File "/home/pi/MusicToaster/musicbot/bot.py", line 1822, in cmd_audiocache 
    stdout=asyncio.subprocess.PIPE) 
    File "/usr/local/lib/python3.5/asyncio/subprocess.py", line 212, in create_subprocess_exec 
    stderr=stderr, **kwds) 
    File "/usr/local/lib/python3.5/asyncio/base_events.py", line 970, in subprocess_exec 
    bufsize, **kwargs) 
    File "/usr/local/lib/python3.5/asyncio/unix_events.py", line 184, in _make_subprocess_transport 
    **kwargs) 
    File "/usr/local/lib/python3.5/asyncio/base_subprocess.py", line 40, in __init__ 
    stderr=stderr, bufsize=bufsize, **kwargs) 
    File "/usr/local/lib/python3.5/asyncio/unix_events.py", line 635, in _start 
    universal_newlines=False, bufsize=bufsize, **kwargs) 
    File "/usr/local/lib/python3.5/subprocess.py", line 950, in __init__ 
    restore_signals, start_new_session) 
    File "/usr/local/lib/python3.5/subprocess.py", line 1540, in _execute_child 
    raise child_exception_type(errno_num, err_msg) 
FileNotFoundError: [Errno 2] No such file or directory: 'find /home/pi/MusicToaster/audio_cache -type f | wc -l'` 

伊夫检查命令进出口运行，我不能缝找个理由，为什么它会有一个错误，当我在手动键入它，我有没有问题：

价值增加了​​，因为博牛逼写入到该文件夹​​，而我是采取这一截图

这里是代码的命令写的是运行：

async def cmd_audiocache(self, channel): 
    await self.safe_send_message(channel, "hang on ill check :thinking:") 
    process = await asyncio.create_subprocess_exec(
     'find /home/pi/MusicToaster/audio_cache -type f | wc -l', 
     stdout=asyncio.subprocess.PIPE) 
    stdout, stderr = await process.communicate() 
    file_count = stdout.decode().strip() 
    file_count = str(file_count) 
    file_count = file_count + " songs stored" 
    await self.safe_send_message(channel, file_count) 
    process = await asyncio.create_subprocess_exec(
     'du /home/pi/MusicToaster/audio_cache -h', 
     stdout=asyncio.subprocess.PIPE) 
    stdout, stderr = await process.communicate() 
    file_size = stdout.decode().strip() 
    file_size = str(file_size) 
    file_size = "all songs total to" + file_size 
    await self.safe_send_message(channel, file_size) 

请原谅代码的混乱，我不整洁的代码，直到我知道有用。

Answer 1

注create_subprocess_exec之间的区别：

从一个或多个字符串参数创建一个子[...]其中第一个字符串指定要执行的程序，剩下的字符串指定程序的参数。

和create_subprocess_shell：

创建一个从CMD一个子进程[...]使用平台的“壳”的语法。

例子：

# Using exec 
process = await asyncio.create_subprocess_exec('ls', '-l') 
# Using shell 
process = await asyncio.create_subprocess_shell('ls -l')