upstream/mercurial-mirror Files · contrib/python-zstandard/tests/test_estimate_sizes.py

manifest: delay import of `typing.ByteString` for py 3.14 support (issue6940)...

manifest: delay import of `typing.ByteString` for py 3.14 support (issue6940) Since Python 2.7 and 3.5, `typing.ByteString` was defined as an alias for `bytes | bytearray | memoryview`, and `bytes` was also accepted as a shorthand for this, so we have `bytes` sprinkled all over the codebase. But then PEP-688 reversed all of that by deprecating `typing.ByteString` and its successor `collections.abc.ByteString` in Python 3.12 (as well as the `bytes` shorthand)[1], and removing it completely in Python 3.14. That leaves us with a couple of problems, namely defining something useful that spans py3.8-py3.13 and keeps pytype happy, and finding all of the instances where `bytes` doesn't really mean `bytes`. The current successor to all of this is `collections.abc.Buffer` in Python 3.12 (or `typing_extensions.Buffer` in previous versions). However, the current CI does type checking using Python 3.11 (so the former is not avaiable), and pytype has issues with importing `typing_extensions.Buffer`[2]. The good news is we don't need to deal with this mess immediately, since the type annotation evaluation is delayed to the type checking phase, and we're making no effort at supporting it in all supported versions of Python. So by delaying the import of this particular symbol, we can still use it for type checking purposes, but can start assessing Python 3.14 problems without doing a lot of extra work. Putting this on stable will allow people interested in 3.14 to work on it 4-5 extra months earlier (and apparently there's some interest). [1] https://peps.python.org/pep-0688/#no-special-meaning-for-bytes [2] https://github.com/google/pytype/issues/1772

Gregory Szorc - - Load All Authors

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        Gregory Szorc
    
zstandard: vendor python-zstandard 0.9.0...

              r37513
            
      import unittest

        Gregory Szorc
    
zstd: vendor python-zstandard 0.5.0...

              r30435
            
        Gregory Szorc
    
zstandard: vendor python-zstandard 0.9.0...

              r37513
            
      import zstandard as zstd

        Gregory Szorc
    
zstd: vendor python-zstandard 0.5.0...

              r30435
            
        Gregory Szorc
    
zstandard: vendor python-zstandard 0.13.0...

              r44446
            
      from .common import (

        Gregory Szorc
    
zstd: vendor python-zstandard 0.7.0...

              r30895
            
          make_cffi,

        Gregory Szorc
    
zstandard: vendor python-zstandard 0.13.0...

              r44446
            
          TestCase,

        Gregory Szorc
    
zstd: vendor python-zstandard 0.7.0...

              r30895
            
      )

        Gregory Szorc
    
zstd: vendor python-zstandard 0.5.0...

              r30435
            
        Gregory Szorc
    
zstd: vendor python-zstandard 0.7.0...

              r30895
            
      @make_cffi

        Gregory Szorc
    
zstandard: vendor python-zstandard 0.13.0...

              r44446
            
      class TestSizes(TestCase):

        Gregory Szorc
    
zstd: vendor python-zstandard 0.5.0...

              r30435
            
          def test_decompression_size(self):

              size = zstd.estimate_decompression_context_size()

              self.assertGreater(size, 100000)

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Gregory Szorc zstandard: vendor python-zstandard 0.9.0...	r37513	import unittest
Gregory Szorc zstd: vendor python-zstandard 0.5.0...	r30435
Gregory Szorc zstandard: vendor python-zstandard 0.9.0...	r37513	import zstandard as zstd
Gregory Szorc zstd: vendor python-zstandard 0.5.0...	r30435
Gregory Szorc zstandard: vendor python-zstandard 0.13.0...	r44446	from .common import (
Gregory Szorc zstd: vendor python-zstandard 0.7.0...	r30895	make_cffi,
Gregory Szorc zstandard: vendor python-zstandard 0.13.0...	r44446	TestCase,
Gregory Szorc zstd: vendor python-zstandard 0.7.0...	r30895	)
Gregory Szorc zstd: vendor python-zstandard 0.5.0...	r30435
Gregory Szorc zstd: vendor python-zstandard 0.7.0...	r30895
		@make_cffi
Gregory Szorc zstandard: vendor python-zstandard 0.13.0...	r44446	class TestSizes(TestCase):
Gregory Szorc zstd: vendor python-zstandard 0.5.0...	r30435	def test_decompression_size(self):
		size = zstd.estimate_decompression_context_size()
		self.assertGreater(size, 100000)