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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
+==========================
+
+-