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Re: Returning a custom file object (Python 3)

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Steven D'Aprano <steve@pearwood.info> writes:

> from io import TextIOWrapper
> class MyFile(TextIOWrapper):
>     pass
>
> but how do I tell open() to use MyFile?

I haven't used it, but does the ‘opener’ parameter do what you want?

    open(file, mode='r', buffering=-1, encoding=None,
             errors=None, newline=None, closefd=True, opener=None) ->
             file object

    […]

    A custom opener can be used by passing a callable as *opener*. The
    underlying file descriptor for the file object is then obtained by
    calling *opener* with (*file*, *flags*). *opener* must return an
    open file descriptor (passing os.open as *opener* results in
    functionality similar to passing None).

-- 
 \          “Our products just aren't engineered for security.” —Brian |
  `\             Valentine, senior vice-president of Microsoft Windows |
_o__)                                                      development |
Ben Finney

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Thread

Returning a custom file object (Python 3) Steven D'Aprano <steve@pearwood.info> - 2015-05-28 12:16 +1000
  Re: Returning a custom file object (Python 3) Ben Finney <ben+python@benfinney.id.au> - 2015-05-28 12:40 +1000
    Re: Returning a custom file object (Python 3) Marko Rauhamaa <marko@pacujo.net> - 2015-05-28 08:29 +0300
      Re: Returning a custom file object (Python 3) Chris Angelico <rosuav@gmail.com> - 2015-05-28 15:49 +1000
        Re: Returning a custom file object (Python 3) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-05-28 17:04 +1000
          Re: Returning a custom file object (Python 3) Chris Angelico <rosuav@gmail.com> - 2015-05-28 19:06 +1000
      Re: Returning a custom file object (Python 3) Gary Herron <gherron@digipen.edu> - 2015-05-27 22:56 -0700
        Re: Returning a custom file object (Python 3) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2015-05-28 16:52 +1000
  Re: Returning a custom file object (Python 3) Ben Finney <ben+python@benfinney.id.au> - 2015-05-28 12:34 +1000
  Re: Returning a custom file object (Python 3) Oscar Benjamin <oscar.j.benjamin@gmail.com> - 2015-05-28 10:29 +0100

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