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pythonwindowsfilesystemsmkdir

Python mkdir giving me wrong permissions


I'm trying to create a folder and create a file within it.

Whenever i create that folder (via Python), it creates a folder that gives me no permissions at all and read-only mode.

When i try to create the file i get an IOError.

Error:  <type 'exceptions.IOError'>

I tried creating (and searching) for a description of all other modes (besides 0770).

Can anyone give me light? What are the other mode codes?


Solution

  • After you create the folder you can set the permissions with os.chmod

    The mod is written in base 8, if you convert it to binary it would be

    000 111 111 000
        rwx rwx rwx
    

    The first rwx is for owner, the second is for the group and the third is for world

    r=read,w=write,x=execute

    The permissions you see most often are
    7 read/write/execute - you need execute for directories to see the contents
    6 read/write
    4 readonly

    When you use os.chmod it makes most sense to use octal notation so

    os.chmod('myfile',0o666)  # read/write by everyone
    os.chmod('myfile',0o644)  # read/write by me, readable for everone else
    

    Remember I said you usually want directories to be "executable" so you can see the contents.

    os.chmod('mydir',0o777)  # read/write by everyone
    os.chmod('mydir',0o755)  # read/write by me, readable for everone else
    

    Note: The syntax of 0o777 is for Python 2.6 and 3+. otherwise for the 2 series it is 0777. 2.6 accepts either syntax so the one you choose will depend on whether you want to be forward or backward compatible.