What can lead to IOError Errno 9 Bad file descriptor during os system

Question

I am using a scientific software including a Python script that is calling os system   which is used to run another scientific program  While the subprocess is running  Python at some point prints the following   close failed in file object destructor  IOError   Errno 9  Bad file descriptor   I believe that this message is printed at the same time as os system   returns   My questions now are   Which conditions can lead to this type of IOError  What does it exactly mean  What does it mean for the subprocess that has been invoked by os system

User · Answer

You can get this error if you use wrong mode when opening the file. For example:

    with open(output, 'wb') as output_file:
        print output_file.read()

In that code, I want to read the file, but I use mode wb instead of r or r+

User · Answer

You get this error message if a Python file was closed from  the outside   i e  not from the file object s close   method    gt  gt  gt  f   open   bashrc    gt  gt  gt  os close f fileno     gt  gt  gt  del f close failed in file object destructor  IOError   Errno 9  Bad file descriptor   The line del f deletes the last reference to the file object  causing its destructor file   del   to be called   The internal state of the file object indicates the file is still open since f close   was never called  so the destructor tries to close the file   The OS subsequently throws an error because of the attempt to close a file that s not open   Since the implementation of os system   does not create any Python file objects  it does not seem likely that the system   call is the origin of the error   Maybe you could show a bit more code

[python] What can lead to "IOError: [Errno 9] Bad file descriptor" during os.system()?

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