os.access() problem

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  • Phil Schmidt
    #1

    os.access() problem

    I just got a new PC with Windows XP, and I want to run Leo on it. Leo
    uses the os.access() function to check for read-only files. For some
    reason, os.access(<file name>, os.W_OK) always returns false.

    I wrote a 2-liner Python script to just test os.access on any file.
    I have tried this with Python 2.4 and 2.5b1.
    I have uninstalled and re-installed Python and Leo.
    I have fiddled with file permissions on the target files as well as on
    the Python installation itself.
    I have used cacls to check the access control lists (and although I'm
    not exactly certain what to do with this information, it appears to be
    ok - I think).

    None of the above has helped me to identify or fix the problem.

    A scan of the Python newsgroup suggests that os.access() may not be the
    best way to check for read-only, but the discussion is a bit deeper
    than my understanding, so I'm not sure there's anything to it in this
    case.

    I realize this must be a Windows permissions thing, but I just can't
    figure it out. I'm no expert in Windows security beyond basic
    permissions, so I could be missing something simple. Can anyone offer
    any suggestions?

    Thanks,
    Phil

    Tags: os.access
    • Larry Bates
      #2
      Re: os.access() problem

      Phil Schmidt wrote:
      I just got a new PC with Windows XP, and I want to run Leo on it. Leo
      uses the os.access() function to check for read-only files. For some
      reason, os.access(<file name>, os.W_OK) always returns false.
      >
      I wrote a 2-liner Python script to just test os.access on any file.
      I have tried this with Python 2.4 and 2.5b1.
      I have uninstalled and re-installed Python and Leo.
      I have fiddled with file permissions on the target files as well as on
      the Python installation itself.
      I have used cacls to check the access control lists (and although I'm
      not exactly certain what to do with this information, it appears to be
      ok - I think).
      >
      None of the above has helped me to identify or fix the problem.
      >
      A scan of the Python newsgroup suggests that os.access() may not be the
      best way to check for read-only, but the discussion is a bit deeper
      than my understanding, so I'm not sure there's anything to it in this
      case.
      >
      I realize this must be a Windows permissions thing, but I just can't
      figure it out. I'm no expert in Windows security beyond basic
      permissions, so I could be missing something simple. Can anyone offer
      any suggestions?
      >
      Thanks,
      Phil
      >
      I just tested on Windows XP with ActiveState Python 2.4.1 and it works
      as expected.
      >>import os
      >>os.access(r'c :\output.txt', os.W_OK)
      True

      Changed file to read-only
      >>os.access(r'c :\output.txt', os.W_OK)
      False
      >>>
      FYI, Larry Bates

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