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Groups > comp.lang.python > #89996

Re: Stripping unencodable characters from a string

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Paul  Moore <p.f.moore@gmail.com>:

> Nor can I - that's my point. But if all I have is an open text-mode
> file with the "strict" error mode, I have to incur one encode, and I
> have to make sure that no characters are passed to that encode which
> can't be encoded.

The file-like object you are given carries some baggage. IOW, it's not a
"file" in the sense you are thinking about it. It's some object that
accepts data with its write() method.

Now, Python file-like objects ostensibly implement a common interface.
However, as you are describing here, not all write() methods accept the
same arguments. Text file objects expect str objects while binary file
objects expect bytes objects. Maybe there are yet other file-like
objects that expect some other types of object as their arguments.

Bottom line: Python doesn't fulfill your expectation. Your library can't
operate on generic file-like objects because Python3 doesn't have
generic file-like objects. Your library must do something else. For
example, you could require a binary file object. The caller must then
possibly wrap their actual object inside a converter, which is
relatively trivial in Python.


Marko

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Thread

Stripping unencodable characters from a string Paul  Moore <p.f.moore@gmail.com> - 2015-05-05 11:19 -0700
  Re: Stripping unencodable characters from a string Dave Angel <davea@davea.name> - 2015-05-05 15:00 -0400
    Re: Stripping unencodable characters from a string Paul  Moore <p.f.moore@gmail.com> - 2015-05-05 12:24 -0700
      Re: Stripping unencodable characters from a string Marko Rauhamaa <marko@pacujo.net> - 2015-05-05 22:55 +0300
  Re: Stripping unencodable characters from a string Jon Ribbens <jon+usenet@unequivocal.co.uk> - 2015-05-05 19:33 +0000
  Re: Stripping unencodable characters from a string Chris Angelico <rosuav@gmail.com> - 2015-05-06 10:02 +1000
  Re: Stripping unencodable characters from a string Serhiy Storchaka <storchaka@gmail.com> - 2015-05-08 15:28 +0300

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