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Groups > comp.lang.python > #100391
| From | Erik <python@lucidity.plus.com> |
|---|---|
| Newsgroups | comp.lang.python |
| Subject | Re: Weird list conversion |
| Date | 2015-12-13 20:28 +0000 |
| Message-ID | <mailman.218.1450038500.12405.python-list@python.org> (permalink) |
| References | <5926ced0-5b86-41f2-81e8-55cc6f71b78c@googlegroups.com> <mailman.216.1450036662.12405.python-list@python.org> <3193bf38-82c3-4538-b500-5e23158898e6@googlegroups.com> |
On 13/12/15 20:05, KP wrote:
> On Sunday, 13 December 2015 11:57:57 UTC-8, Laura Creighton wrote:
>> In a message of Sun, 13 Dec 2015 11:45:19 -0800, KP writes:
>>> Hi all,
>>>
>>> f = open("stairs.bin", "rb") data = list(f.read(16)) print data
>>>
>>> returns
>>>
>>> ['=', '\x04', '\x00', '\x05', '\x00', '\x01', '\x00', '\x00',
>>> '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00', '\x00']
>>>
>>> The first byte of the file is 0x3D according to my hex editor, so
>>> why does Python return '=' and not '\x3D'?
>>>
>>> As always, thanks for any help!
>>
>> 0x3d is the ascii code for '='
>
> I am aware of that - so is the rule that non-printables are returned
> in hex notation whereas printables come in their ASCII
> representation?
No, what is _returned_ is a list of one-byte strings.
When you call "print", then the list class's __repr__() method is called
which in turn calls the contained objects' __repr__() methods in turn -
it is those methods (in this case, they are all the string class's)
which is deciding to render ASCII printable characters as just their
value and ASCII non-printable characters using their hex notation.
E.
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Weird list conversion high5storage@gmail.com - 2015-12-13 11:45 -0800
Re: Weird list conversion Laura Creighton <lac@openend.se> - 2015-12-13 20:57 +0100
Re: Weird list conversion KP <kai.peters@gmail.com> - 2015-12-13 12:05 -0800
Re: Weird list conversion Erik <python@lucidity.plus.com> - 2015-12-13 20:28 +0000
Re: Weird list conversion Ian Kelly <ian.g.kelly@gmail.com> - 2015-12-13 13:28 -0700
Re: Weird list conversion Erik <python@lucidity.plus.com> - 2015-12-13 20:31 +0000
Re: Weird list conversion Larry Hudson <orgnut@yahoo.com> - 2015-12-13 12:42 -0800
Re: Weird list conversion Chris Angelico <rosuav@gmail.com> - 2015-12-14 08:09 +1100
Re: Weird list conversion Ian Kelly <ian.g.kelly@gmail.com> - 2015-12-13 12:59 -0700
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