Re: Wait... WHAT?

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From	Ian Kelly <ian.g.kelly@gmail.com>
Date	Wed, 12 Feb 2014 17:01:13 -0700
Subject	Re: Wait... WHAT?
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On Wed, Feb 12, 2014 at 3:14 PM, Tim Chase
<python.list@tim.thechases.com> wrote:
> On 2014-02-12 14:35, Ian Kelly wrote:
>> You can't write lists directly to files.  You can only write strings
>> to files.  To write and read a list, you'll need to first serialize
>> it and later deserialize it.
>
> To be pedantic, you can only write *bytes* to files, so you need to
> serialize your lists (or other objects) to strings and then encode
> those to bytes; or skip the string and encode your list/object
> directly to bytes.

The file was opened in text mode, not binary mode.

Python 3.3.0 (v3.3.0:bd8afb90ebf2, Sep 29 2012, 10:55:48) [MSC v.1600 32 bit (In
tel)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> f = open('test.txt', 'w')
>>> f.write(b'hello world')
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: must be str, not bytes

Thread

Wait... WHAT? eneskristo@gmail.com - 2014-02-12 11:43 -0800
  Re: Wait... WHAT? Ian Kelly <ian.g.kelly@gmail.com> - 2014-02-12 13:13 -0700
  Re: Wait... WHAT? eneskristo@gmail.com - 2014-02-12 12:21 -0800
    Re: Wait... WHAT? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-02-12 20:38 +0000
    Re: Wait... WHAT? Ian Kelly <ian.g.kelly@gmail.com> - 2014-02-12 14:35 -0700
    Re: Wait... WHAT? Michael Torrie <torriem@gmail.com> - 2014-02-12 14:39 -0700
    Re: Wait... WHAT? Tim Chase <python.list@tim.thechases.com> - 2014-02-12 16:14 -0600
    Re: Wait... WHAT? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-02-12 23:36 +0000
    Re: Wait... WHAT? Ian Kelly <ian.g.kelly@gmail.com> - 2014-02-12 17:01 -0700
    Re: Wait... WHAT? Tim Chase <python.list@tim.thechases.com> - 2014-02-12 18:44 -0600
    Re: Wait... WHAT? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-02-13 00:59 +0000
    Re: Wait... WHAT? Chris Angelico <rosuav@gmail.com> - 2014-02-13 12:10 +1100
    Re: Wait... WHAT? Tim Chase <python.list@tim.thechases.com> - 2014-02-12 21:29 -0600
    Re: Wait... WHAT? Chris Angelico <rosuav@gmail.com> - 2014-02-13 14:47 +1100
      Re: Wait... WHAT? eneskristo@gmail.com - 2014-02-13 09:46 -0800
        Re: Wait... WHAT? MRAB <python@mrabarnett.plus.com> - 2014-02-13 18:25 +0000
        Re: Wait... WHAT? Michael Torrie <torriem@gmail.com> - 2014-02-13 15:22 -0700
  Re: Wait... WHAT? eneskristo@gmail.com - 2014-02-12 12:43 -0800
    Re: Wait... WHAT? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-02-12 20:56 +0000
      Re: Wait... WHAT? eneskristo@gmail.com - 2014-02-12 12:59 -0800
        Re: Wait... WHAT? Chris Angelico <rosuav@gmail.com> - 2014-02-13 08:17 +1100
        Re: Wait... WHAT? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-02-12 21:23 +0000
    Re: Wait... WHAT? Grant Edwards <invalid@invalid.invalid> - 2014-02-12 23:09 +0000

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