Chris Angelico schreef op 16/07/2018 23:57:
On Tue, Jul 17, 2018 at 7:50 AM, Roel Schroeven <r...@roelschroeven.net> wrote:
Steven D'Aprano schreef op 16/07/2018 2:18:
On Sun, 15 Jul 2018 16:08:15 -0700, Jim Lee wrote:
Python3 is intrinsically tied to Unicode for string handling. Therefore,
the Python programmer is forced to deal with it (in all but trivial
cases), rather than given a choice. So I don't understand how I can
illustrate my point with Python code since Python won't let me deal with
strings without also dealing with Unicode.
Nonsense.
b"Look ma, a Python 2 style ASCII string."
Except for one little difference, which has bitten be me a few times.
Consider this code:
from __future__ import print_function
s = b"Look ma, a Python 2 style ASCII string."
print('First element:', s[0])
Result in Python 2: First element: L
Result in Python 3: First element: 76
Likewise this code:
from __future__ import print_function
for e in b'hello':
print(e, end=', ')
print()
Result in Python 2: h, e, l, l, o,
Result in Python 3: 104, 101, 108, 108, 111,
There are times (encoding/decoding network protocols and other data formats)
when I have a byte string and I want/need to process it like Python 2 does,
and that is the one area where I feel Python 3 make things a bit more
difficult.
For the most part, you probably want to decode it as ASCII, if you
want to process it as text. Remember, bytes are simply numbers -
octets, groups of eight bits. For it to mean the English word "hello",
that byte sequence has to be interpreted as ASCII, which is accurately
indicated as b'hello'.decode('ascii').
I think I've had cases where that approach didn't work very well, but
unfortunately I can't readily think of any concrete examples.
In any case, even though Python 3's byte strings are not quite unlike
Python 2's strings, they're not exactly like them either. And I feel
there are cases where that makes things somewhat harder, even though I
can't prove it.
--
"Honest criticism is hard to take, particularly from a relative, a
friend, an acquaintance, or a stranger."
-- Franklin P. Jones
Roel Schroeven
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