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Groups > comp.lang.python > #80762

Re: fileno() not supported in Python 3.1

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On Thu, 13 Nov 2014 15:48:32 -0800, satishmlmlml wrote:

> import sys 
> for stream in (sys.stdin, sys.stdout, sys.stderr): 
>            print(stream.fileno()) 
> 
> 
> io.UnsupportedOperation: fileno 
> 
> Is there a workaround?

Try:
	sys.stdin.buffer.fileno()

or maybe

	sys.stdin.buffer.raw.fileno()

In Python 3.x, sys.stdin isn't actually a "file", it's a TextIOWrapper
around a BufferedReader around a file (io.FileIO).

TextIOWrapper is responsible for converting a stream of bytes to a stream
of (Unicode) characters. BufferedReader is responsible for buffering (like
C stdio).

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fileno() not supported in Python 3.1 satishmlmlml@gmail.com - 2014-11-13 15:48 -0800
  Re: fileno() not supported in Python 3.1 Ben Finney <ben+python@benfinney.id.au> - 2014-11-14 10:57 +1100
    Re: fileno() not supported in Python 3.1 satishmlmlml@gmail.com - 2014-11-13 16:08 -0800
      Re: fileno() not supported in Python 3.1 Ben Finney <ben+python@benfinney.id.au> - 2014-11-14 13:52 +1100
  Re: fileno() not supported in Python 3.1 Cameron Simpson <cs@zip.com.au> - 2014-11-14 18:36 +1100
  Re: fileno() not supported in Python 3.1 Nobody <nobody@nowhere.invalid> - 2014-11-14 13:59 +0000
    Re: fileno() not supported in Python 3.1 Joel Goldstick <joel.goldstick@gmail.com> - 2014-11-14 09:09 -0500
  Re: fileno() not supported in Python 3.1 Ian Kelly <ian.g.kelly@gmail.com> - 2014-11-14 09:51 -0700
    Re: fileno() not supported in Python 3.1 Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-11-15 22:23 +1100
  Re: fileno() not supported in Python 3.1 Dan Stromberg <drsalists@gmail.com> - 2014-11-15 21:25 -0800
  Re: fileno() not supported in Python 3.1 Chris Angelico <rosuav@gmail.com> - 2014-11-16 16:29 +1100

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