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@@ -1,8 +1,25 @@
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2015-02-22 version 3.0.0-alpha-2 (Ruby/JavaNano):
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General
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* Introduced two new language implementations (Ruby and JavaNano) to proto3.
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+ * Added proto3 support for Python, and various other improvements.
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* Various bug fixes since 3.0.0-alpha-1
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+ Python:
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+ Python has received several updates, most notably support for proto3
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+ semantics in any .proto file that declares syntax="proto3".
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+ Messages declared in proto3 files no longer represent field presence
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+ for scalar fields (number, enums, booleans, or strings). You can
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+ no longer call HasField() for such fields, and they are serialized
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+ based on whether they have a non-zero/empty/false value.
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+
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+ One other notable change is in the C++-accelerated implementation.
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+ Descriptor objects (which describe the protobuf schema and allow
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+ reflection over it) are no longer duplicated between the Python
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+ and C++ layers. The Python descriptors are now simple wrappers
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+ around the C++ descriptors. This change should significantly
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+ reduce the memory usage of programs that use a lot of message
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+ types.
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+
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Ruby:
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We have added proto3 support for Ruby via a native C extension.
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Josh Haberman