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Added release notes about Python changes.

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Josh Haberman 2015-02-25 23:06:35 -08:00
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2015-02-22 version 3.0.0-alpha-2 (Ruby/JavaNano):
General
* Introduced two new language implementations (Ruby and JavaNano) to proto3.
* Added proto3 support for Python, and various other improvements.
* Various bug fixes since 3.0.0-alpha-1
Python:
Python has received several updates, most notably support for proto3
semantics in any .proto file that declares syntax="proto3".
Messages declared in proto3 files no longer represent field presence
for scalar fields (number, enums, booleans, or strings). You can
no longer call HasField() for such fields, and they are serialized
based on whether they have a non-zero/empty/false value.
One other notable change is in the C++-accelerated implementation.
Descriptor objects (which describe the protobuf schema and allow
reflection over it) are no longer duplicated between the Python
and C++ layers. The Python descriptors are now simple wrappers
around the C++ descriptors. This change should significantly
reduce the memory usage of programs that use a lot of message
types.
Ruby:
We have added proto3 support for Ruby via a native C extension.