Commits on Jul 23, 2023

1. pythongh-107137: Add _PyTupleBuilder API to the internal C API …

   Add _PyTupleBuilder structure and functions:
   
   * _PyTupleBuilder_Init()
   * _PyTupleBuilder_Alloc()
   * _PyTupleBuilder_Append()
   * _PyTupleBuilder_AppendUnsafe()
   * _PyTupleBuilder_Finish()
   * _PyTupleBuilder_Dealloc()
   
   The builder tracks the size of the tuple and resize it in
   _PyTupleBuilder_Finish() if needed. Don't allocate empty tuple.
   Allocate an array of 16 objects on the stack to avoid allocating
   small tuple. _PyTupleBuilder_Append() overallocates the tuple by 25%
   to reduce the number of _PyTuple_Resize() calls.
   
   Do no track the temporary internal tuple by the GC before
   _PyTupleBuilder_Finish() creates the final complete and consistent
   tuple object.
   
   Use _PyTupleBuilder API in itertools batched_traverse(),
   PySequence_Tuple() and initialize_structseq_dict().
   
   Add also helper functions:
   
   * _PyTuple_ResizeNoTrack()
   * _PyTuple_NewNoTrack()

   

   vstinner committed Jul 23, 2023
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