encode and decode builtins
ned at nedbatchelder.com
Sun Nov 16 14:43:49 CET 2014
On 11/16/14 2:39 AM, Garrett Berg wrote:
> I made the switch to python 3 about two months ago, and I have to say I
> love everything about it, /especially/ the change to using only bytes
> and str (no more unicode! or... everything is unicode!) As someone who
> works with embedded devices, it is great to know what data I am working
I am glad that you are excited about Python 3. But I'm a little
surprised to hear your characterization of the changes it brought. Both
Python 2 and Python 3 are the same in that they have two types for
representing strings: one for byte strings, and one for Unicode strings.
The difference is that Python 2 called them str and unicode, with ""
being a byte string; Python 3 calls them bytes and str, with "" being a
unicode string. Also, Python 2 happily converted between them
implicitly, while Python 3 does not.
> However, there are times that I do not care what data I am working with,
> and I find myself writing something like:
> if isinstance(data, bytes): data = data.decode()
This goes against a fundamental tenet of both Python 2 and 3: you should
know what data you have, and deal with it properly.
> This is tedious and breaks the pythonic method of not caring about what
> your input is. If I expect that my input can always be decoded into
> valid data, then why do I have to write this?
> Instead, I would like to propose to add *encode* and *decode* as
> builtins. I have written simple code to demonstrate my desire:
If you find these functions useful, by all means use them in your code.
BTW: looks to me like you have infinite recursion on lines 9 and 20,
so that must be a simple oversight.
> There may be a few edge cases I am missing, which would all the more
> prove my point -- we need a function like this!
You are free to have a function like that. Getting them added to the
standard library is extremely unlikely.
> Basically, if I expect my data to be a string I can just write:
> data = decode(data)
> Which would accomplish two goals: explicitly stating what I expect of
> my data, and doing so concisely and cleanly.
Ned Batchelder, http://nedbatchelder.com
More information about the Python-list