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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OSError: [Errno 2] No such file or directory while using python subprocess in Django
提问by Sandeep Mederametla
I am trying to run a program to make some system calls inside Python code using subprocess.call()which throws the following error:
我正在尝试运行一个程序来在 Python 代码中进行一些系统调用，使用subprocess.call()它会引发以下错误：
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
My actual Python code is as follows:
我的实际 Python 代码如下：
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)
Can I get some relevant advice on how to solve this?
我能得到一些有关如何解决这个问题的相关建议吗？
采纳答案by Ashwini Chaudhary
Use shell=Trueif you're passing a string to subprocess.call.
使用shell=True，如果你传递一个字符串subprocess.call。
From docs:
从文档：
If passing a single string, either
shellmust beTrueor else the string must simply name the program to be executed without specifying any arguments.
如果传递单个字符串，要么
shell必须是True要么字符串必须简单地命名要执行的程序而不指定任何参数。
subprocess.call(crop, shell=True)
or:
或者：
import shlex
subprocess.call(shlex.split(crop))
回答by Dusan Maksic
Can't upvote so I'll repost @jfs comment cause I think it should be more visible.
无法投票，所以我会重新发布@jfs 评论，因为我认为它应该更明显。
@AnneTheAgile: shell=True is not required. Moreover you should not use it unless it is necessary (see @ valid's comment). You should pass each command-line argument as a separate list item instead e.g., use ['command', 'arg 1', 'arg 2'] instead of "command 'arg 1' 'arg 2'". – jfs Mar 3 '15 at 10:02
@AnneTheAgile：shell=True 不是必需的。此外，除非有必要，否则不应使用它（请参阅@valid 的评论）。您应该将每个命令行参数作为单独的列表项传递，例如，使用 ['command', 'arg 1', 'arg 2'] 而不是“command 'arg 1' 'arg 2'”。– jfs 2015 年 3 月 3 日 10:02
回答by Daniil Mashkin
No such file or directorycan be also raised if you are trying to put a file argument to Popenwith double-quotes.
No such file or directory如果您尝试Popen使用双引号将文件参数放入，也可以引发。
For example:
例如：
call_args = ['mv', '"path/to/file with spaces.txt"', 'somewhere']
In this case, you need to remove double-quotes.
在这种情况下，您需要删除双引号。
call_args = ['mv', 'path/to/file with spaces.txt', 'somewhere']
