On Fri, Dec 4, 2015 at 2:40 AM, Julian Taylor <jtaylor.deb...@googlemail.com
> wrote:
> dropping 3.2: +-0 as it would remove some extra code in our broken py3
> string handling but not much
> dropping 3.3: -1 doesn't gain us anything so far I know
> dropping 2.6: -1, I don't see not enough advantage the only issue I know
> of is an occasional set literal which gets caught by our test-suite
> immediately. Besides 2.6 is still the default in RHEL6. But if there is
> something larger which makes it worthwhile I don't know about I have no
> objections.
>
My thought is that dropping 2.6 allows a more unified code base between
Python 2 and Python3. In 2.7 we get
- The syntax for set literals ({1,2,3} is a mutable set).
- Dictionary and set comprehensions ({i: i*2 for i in range(3)}).
- Multiple context managers in a single with
<https://docs.python.org/3/reference/compound_stmts.html#with> statement.
- A new version of the io
<https://docs.python.org/3/library/io.html#module-io> library, rewritten
in C for performance.
- The ordered-dictionary type described in *PEP 372: Adding an Ordered
Dictionary to collections*
<https://docs.python.org/3/whatsnew/2.7.html#pep-0372>.
- The new "," format specifier described in *PEP 378: Format Specifier
for Thousands Separator*
<https://docs.python.org/3/whatsnew/2.7.html#pep-0378>.
- The memoryview
<https://docs.python.org/3/library/stdtypes.html#memoryview> object.
- A small subset of the importlib
<https://docs.python.org/3/library/importlib.html#module-importlib>
module, described below
<https://docs.python.org/3/whatsnew/2.7.html#importlib-section>.
- The repr() <https://docs.python.org/3/library/functions.html#repr> of
a float x is shorter in many cases: it’s now based on the shortest
decimal string that’s guaranteed to round back to x. As in previous
versions of Python, it’s guaranteed that float(repr(x)) recovers x.
- Float-to-string and string-to-float conversions are correctly rounded.
The round() <https://docs.python.org/3/library/functions.html#round>
function is also now correctly rounded.
- The PyCapsule
<https://docs.python.org/3/c-api/capsule.html#c.PyCapsule> type, used to
provide a C API for extension modules.
- The PyLong_AsLongAndOverflow()
<https://docs.python.org/3/c-api/long.html#c.PyLong_AsLongAndOverflow> C
API function.
In particular, memoryview and PyCapsule are available. Moving to Python 3.3
as a minimum provides unicode literals. Python 3.4 strikes me as the end of
the Python 3 beginning, with future Python development taking off from
there.
<snip>
Chuck
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