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-.. _why-python3:
-
-Why Python 3?
-=============
-
-- Python 2.7 is the final Python 2.x release. Python 3.x is the future.
- The Python ecosystem needs to consolidate. A split or schism between
- different incompatible versions is not healthy for growing the
- community.
-- Function annotations
-- Decimal module 100x faster. As fast as floats.
-- Easier to learn. (Less cruft in language and stdlib, more consistency, better docstrings, etc.)
-- Much safer handling of unicode text and encodings: fewer bugs.
-- More memory efficiency (shared dict keys (PEP 412) and space-efficient
- Unicode representation (PEP 393))
-- Exception chaining
-
-Why are Unicode strings better on Python 3?
--------------------------------------------
-
-- it is not the default string type (you have to prefix the string
- with a u to get Unicode);
-
-- it is missing some functionality, e.g. casefold;
-
-- there are two distinct implementations, narrow builds and wide builds;
-
-- wide builds take up to four times more memory per string as needed;
-
-- narrow builds take up to two times more memory per string as needed;
-
-- worse, narrow builds have very naive (possibly even "broken")
- handling of code points in the Supplementary Multilingual Planes.
-
-The unicode string type in Python 3 is better because:
-
-- it is the default string type;
-
-- it includes more functionality;
-
-- starting in Python 3.3, it gets rid of the distinction between
- narrow and wide builds;
-
-- which reduces the memory overhead of strings by up to a factor
- of four in many cases;
-
-- and fixes the issue of SMP code points.
-
-(quote from a mailing list post by Steve D'Aprano on 2014-01-17).
-
-
-New features
-------------
-
-Standard library:
-~~~~~~~~~~~~~~~~~
-
-- SSL contexts in http.client
--
-
-
-
-Non-arguments for Python 3
-==========================
-
--