OSError: [Errno 2] 在 Django 中使用 python 子进程时没有这样的文件或目录

问题描述：

我正在尝试运行一个程序以使用 subprocess.call() 在 Python 代码中进行一些系统调用，这会引发以下错误:

I am trying to run a program to make some system calls inside Python code using subprocess.call() which throws the following error:

Traceback (most recent call last):
      File "<console>", line 1, in <module>
      File "/usr/lib/python2.7/subprocess.py", line 493, in call
      return Popen(*popenargs, **kwargs).wait()
      File "/usr/lib/python2.7/subprocess.py", line 679, in __init__
errread, errwrite)
      File "/usr/lib/python2.7/subprocess.py", line 1249, in _execute_child
      raise child_exception
      OSError: [Errno 2] No such file or directory

我的实际Python代码如下:

My actual Python code is as follows:

url = "/media/videos/3cf02324-43e5-4996-bbdf-6377df448ae4.mp4"
real_path = "/home/chanceapp/webapps/chanceapp/chanceapp"+url
fake_crop_path = "/home/chanceapp/webapps/chanceapp/chanceapp/fake1"+url
fake_rotate_path = "/home/chanceapp/webapps/chanceapp.chanceapp/fake2"+url
crop = "ffmpeg -i %s -vf "%(real_path)+"crop=400:400:0:0 "+ "-strict -2 %s"%(fake_crop_path)
rotate = "ffmpeg -i %s -vf "%(fake_crop_path)+"transpose=1 "+"%s"%(fake_rotate_path)
move_rotated = "mv"+" %s"%(fake_rotate_path)+" %s"%(real_path)
delete_cropped = "rm "+"%s"%(fake_crop_path)
#system calls:
subprocess.call(crop)

我能得到一些有关如何解决这个问题的相关建议吗?

Can I get some relevant advice on how to solve this?

答

如果您要将字符串传递给 subprocess.call，请使用 shell=True.

Use shell=True if you're passing a string to subprocess.call.

来自文档:

如果传递单个字符串，shell 必须为 True 或否则字符串必须简单地命名要执行的程序，而不是指定任何参数.

If passing a single string, either shell must be True or else the string must simply name the program to be executed without specifying any arguments.

subprocess.call(crop, shell=True)

或:

import shlex
subprocess.call(shlex.split(crop))

OSError: [Errno 2] 在 Django 中使用 python 子进程时没有这样的文件或目录

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