Cython changelog

Changelog History

Page 1

• v3.0.0 Changes

  April 23, 2020

  🔋 Features added

  • Cython functions now use the PEP-590_ vectorcall protocol in Py3.7+. Patch by Jeroen Demeyer. (Github issue :issue:2263)

  • 👍 Unicode identifiers are supported in Cython code (PEP-3131_). Patch by David Woods. (Github issue :issue:2601)

  • 👍 Unicode module names and imports are supported. Patch by David Woods. (Github issue :issue:3119)

  • 📜 Annotations are no longer parsed, keeping them as strings following PEP-563_. Patch by David Woods. (Github issue :issue:3285)

  • Preliminary support for the CPython's Py_LIMITED_API (stable ABI) is available by setting the CYTHON_LIMITED_API C macro. Note that the support is currently in an early stage and many features do not yet work. You currently still have to define Py_LIMITED_API externally in order to restrict the API usage. This will change when the feature stabilises. Patches by Eddie Elizondo and David Woods. (Github issues :issue:3223, :issue:3311, :issue:3501)

  • The dispatch to fused functions is now linear in the number of arguments, which makes it much faster, often 2x or more, and several times faster for larger fused types with many specialisations. Patch by will-ca. (Github issue :issue:1385)

  • with gil/nogil statements can be conditional based on compile-time constants, e.g. fused type checks. Patch by Noam Hershtig. (Github issue :issue:2579)

  • const can be used together with fused types. Patch by Thomas Vincent. (Github issue :issue:1772)

  • Reimports of already imported modules are substantially faster. (Github issue :issue:2854)

  • 👍 Positional-only arguments are supported in Python functions (PEP-570_). Patch by Josh Tobin. (Github issue :issue:2915)

  • 👍 The volatile C modifier is supported in Cython code. Patch by Jeroen Demeyer. (Github issue :issue:1667)

  • @cython.trashcan(True) can be used on an extension type to enable the CPython :ref:trashcan. This allows deallocating deeply recursive objects without overflowing the stack. Patch by Jeroen Demeyer. (Github issue :issue:2842)

  • Inlined properties can be defined for external extension types. Patch by Matti Picus. (Github issue :issue:2640, redone later in :issue:3571)

  • The str() builtin now calls PyObject_Str() instead of going through a Python call. Patch by William Ayd. (Github issue :issue:3279)

  • String concatenation can now happen in place if possible, by extending the existing string rather than always creating a new one. Patch by David Woods. (Github issue :issue:3453)

  • Multiplication of Python numbers with small constant integers is faster. (Github issue :issue:2808)

  • Some list copying is avoided internally when a new list needs to be created but we already have a fresh one. (Github issue :issue:3494)

  • Extension types that do not need their own tp_new implementation (because they have no object attributes etc.) directly inherit the implementation of their parent type if possible. (Github issue :issue:1555)

  • The attributes gen.gi_frame and coro.cr_frame of Cython compiled generators and coroutines now return an actual frame object for introspection. (Github issue :issue:2306)

  • Several declarations in cpython.*, libc.* and libcpp.* were added. Patches by Jeroen Demeyer, Matthew Edwards, Chris Gyurgyik, Jerome Kieffer and Zackery Spytz. (Github issues :issue:3468, :issue:3332, :issue:3202, :issue:3188, :issue:3179, :issue:2891, :issue:2826, :issue:2713)

  • 🚚 Deprecated NumPy API usages were removed from numpy.pxd. Patch by Matti Picus. (Github issue :issue:3365)

  • cython.inline() now sets the NPY_NO_DEPRECATED_API=NPY_1_7_API_VERSION C macro automatically when numpy is imported in the code, to avoid C compiler warnings about deprecated NumPy C-API usage.

  • The builtin abs() function can now be used on C numbers in nogil code. Patch by Elliott Sales de Andrade. (Github issue :issue:2748)

  • PEP-479_ (generator_stop) is now enabled by default with language level 3. (Github issue :issue:2580)

  • 👍 The cython.view.array type supports inheritance. Patch by David Woods. (Github issue :issue:3413)

  • Code annotation accepts a new debugging argument --annotate-fullc that will include the complete syntax highlighted C file in the HTML output. (Github issue :issue:2855)

  • ✅ --no-capture added to runtests.py to prevent stdout/stderr capturing during srctree tests. Patch by Matti Picus. (Github issue :issue:2701)

  • 📄 --no-docstrings option added to cythonize script. Original patch by mo-han. (Github issue :issue:2889)

  • 👍 cygdb gives better error messages when it fails to initialise the Python runtime support in gdb. Patch by Volker Weissmann. (Github issue :issue:3489)

  • 👍 The Pythran shape attribute is supported. Patch by Serge Guelton. (Github issue :issue:3307)

  🐛 Bugs fixed

  • The unicode methods .upper(), .lower() and .title() were incorrectly optimised for single character input values and only returned the first character if multiple characters should have been returned. They now use the original Python methods again.

  • Fused argument types were not correctly handled in type annotations and cython.locals(). Patch by David Woods. (Github issues :issue:3391, :issue:3142)

  • Diverging from the usual behaviour, len(memoryview), len(char*) and len(Py_UNICODE*) returned an unsigned size_t value. They now return a signed Py_ssize_t, like other usages of len().

  • Nested dict literals in function call kwargs could incorrectly raise an error about duplicate keyword arguments, which are allowed when passing them from dict literals. (Github issue :issue:2963)

  • Item access (subscripting) with integer indices/keys always tried the Sequence protocol before the Mapping protocol, which diverged from Python semantics. It now passes through the Mapping protocol first when supported. (Github issue :issue:1807)

  • Name lookups in class bodies no longer go through an attribute lookup. Patch by Jeroen Demeyer. (Github issue :issue:3100)

  • Broadcast assignments to a multi-dimensional memory view slice could end up in the wrong places when the underlying memory view is known to be contiguous but the slice is not. (Github issue :issue:2941)

  • Pickling unbound methods of Python classes failed. Patch by Pierre Glaser. (Github issue :issue:2972)

  • The Py_hash_t type failed to accept arbitrary "index" values. (Github issue :issue:2752)

  • The first function line number of functions with decorators pointed to the signature line and not the first decorator line, as in Python. Patch by Felix Kohlgrüber. (Github issue :issue:2536)

  • Constant integer expressions that used a negative exponent were evaluated as integer 0 instead of the expected float value. Patch by Kryštof Pilnáček. (Github issue :issue:2133)

  • The cython.declare() and cython.cast() functions could fail in pure mode. Patch by Dmitry Shesterkin. (Github issue :issue:3244)

  • __doc__ was not available inside of the class body during class creation. (Github issue :issue:1635)

  • Setting language_level=2 in a file did not work if language_level=3 was enabled globally before. Patch by Jeroen Demeyer. (Github issue :issue:2791)

  • __init__.pyx files were not always considered as package indicators. (Github issue :issue:2665)

  • Compiling package __init__ files could fail under Windows due to an undefined export symbol. (Github issue :issue:2968)

  • ⚠ A C compiler cast warning was resolved. Patch by Michael Buesch. (Github issue :issue:2775)

  • Binding staticmethods of Cython functions were not behaving like Python methods. Patch by Jeroen Demeyer. (Github issue :issue:3106, :issue:3102)

  • Memoryviews failed to compile when the cache_builtins feature was disabled. Patch by David Woods. (Github issue :issue:3406)

  Other changes

  • 0️⃣ The default language level was changed to 3str, i.e. Python 3 semantics, but with str literals (also in Python 2.7). This is a backwards incompatible change from the previous default of Python 2 semantics. The previous behaviour is available through the directive language_level=2. (Github issue :issue:2565)

  • Cython no longer generates __qualname__ attributes for classes in Python 2.x since they are problematic there and not correctly maintained for subclasses. Patch by Jeroen Demeyer. (Github issue :issue:2772)

  • 🖨 Source file fingerprinting now uses SHA-1 instead of MD5 since the latter tends to be slower and less widely supported these days. (Github issue :issue:2790)

  • 🗄 The long deprecated include files python_*, stdio, stdlib and stl in Cython/Includes/Deprecated/ were removed. Use the libc.* and cpython.* pxd modules instead. Patch by Jeroen Demeyer. (Github issue :issue:2904)

  • The search order for include files was changed. Previously it was include_directories, Cython/Includes, sys.path. Now it is include_directories, sys.path, Cython/Includes. This was done to allow third-party *.pxd files to override the ones in Cython. Patch by Matti Picus. (Github issue :issue:2905)

  • 📜 The command line parser was rewritten and modernised using argparse. Patch by Egor Dranischnikow. (Github issue :issue:2952, :issue:3001)

  • 🗄 Dotted filenames for qualified module names (pkg.mod.pyx) are deprecated. Use the normal Python package directory layout instead. (Github issue :issue:2686)

  • 🐧 Binary Linux wheels now follow the manylinux2010 standard. Patch by Alexey Stepanov. (Github issue :issue:3355)

  • 👌 Support for Python 2.6 was removed.

  .. _PEP-560: https://www.python.org/dev/peps/pep-0560 .. _PEP-570: https://www.python.org/dev/peps/pep-0570 .. _PEP-487: https://www.python.org/dev/peps/pep-0487 .. _PEP-590: https://www.python.org/dev/peps/pep-0590 .. _PEP-3131: https://www.python.org/dev/peps/pep-3131 .. _PEP-563: https://www.python.org/dev/peps/pep-0563 .. _PEP-479: https://www.python.org/dev/peps/pep-0479

  .. _0.29.24:

• v3.0.a5

  May 19, 2020

• v3.0.a4

  May 06, 2020

• v3.0.a3

  April 27, 2020

• v3.0.a2

  April 23, 2020

• v3.0.a1

  April 12, 2020

• v0.29.25 Changes

  🐛 Bugs fixed

  • Avoid copying unaligned 16-bit values since some platforms require them to be aligned. Use memcpy() instead to let the C compiler decide how to do it. (Github issue :issue:4343)

  • ✅ Cython crashed on invalid truthiness tests on C++ types without operator bool. Patch by David Woods. (Github issue :issue:4348)

  • The declaration of PyUnicode_CompareWithASCIIString() in cpython.unicode was incorrect. Patch by Max Bachmann. (Github issue :issue:4344)

  .. _0.29.24:

• v0.29.24 Changes

  July 14, 2021

  🐛 Bugs fixed

  • Inline functions in pxd files that used memory views could lead to invalid C code if the module that imported from them does not use memory views. Patch by David Woods. (Github issue :issue:1415)

  • Several declarations in libcpp.string were added and corrected. Patch by Janek Bevendorff. (Github issue :issue:4268)

  • Pickling unbound Cython compiled methods failed. Patch by Pierre Glaser. (Github issue :issue:2972)

  • The tracing code was adapted to work with CPython 3.10.

  • The optimised in operator failed on unicode strings in Py3.9 and later that were constructed from an external wchar_t source. Also, related C compiler warnings about deprecated C-API usage were resolved. (Github issue :issue:3925)

  • Some compiler crashes were resolved. Patch by David Woods. (Github issues :issue:4214, :issue:2811)

  • 🚚 An incorrect warning about 'unused' generator expressions was removed. (GIthub issue :issue:1699)

  • The attributes gen.gi_frame and coro.cr_frame of Cython compiled generators and coroutines now return an actual frame object for introspection, instead of None. (Github issue :issue:2306)

  .. _0.29.23:

• v0.29.23 Changes

  April 14, 2021

  🐛 Bugs fixed

  • Some problems with Python 3.10 were resolved. Patches by Victor Stinner and David Woods. (Github issues :issue:4046, :issue:4100)

  • 🚚 An incorrect "optimisation" was removed that allowed changes to a keyword dict to leak into keyword arguments passed into a function. Patch by Peng Weikang. (Github issue :issue:3227)

  • Multiplied str constants could end up as bytes constants with language_level=2. Patch by Alphadelta14 and David Woods. (Github issue :issue:3951)

  • PY_SSIZE_T_CLEAN does not get defined any more if it is already defined. Patch by Andrew Jones. (Github issue :issue:4104)

  .. _0.29.22:

• v0.29.22 Changes

  February 20, 2021

  🔋 Features added

  • Some declarations were added to the provided pxd includes. Patches by Zackery Spytz and John Kirkham. (Github issues :issue:3811, :issue:3882, :issue:3899, :issue:3901)

  🐛 Bugs fixed

  • A crash when calling certain functions in Py3.9 and later was resolved. (Github issue :issue:3917)

  • const memory views of structs failed to compile. (Github issue :issue:2251)

  • const template declarations could not be nested. Patch by Ashwin Srinath. (Github issue :issue:1355)

  • The declarations in the cpython.pycapsule module were missing their const modifiers and generated incorrect C code. Patch by Warren Weckesser. (Github issue :issue:3964)

  • Casts to memory views failed for fused dtypes. Patch by David Woods. (Github issue :issue:3881)

  • repr() was assumed to return str instead of unicode with language_level=3. (Github issue :issue:3736)

  • Calling cpdef functions from cimported modules crashed the compiler. Patch by David Woods. (Github issue :issue:4000)

  • Cython no longer validates the ABI size of the NumPy classes it compiled against. See the discussion in https://github.com/numpy/numpy/pull/432

  • ⚠ A C compiler warning about enum value casting was resolved in GCC. (Github issue :issue:2749)

  • Coverage reporting in the annotated HTML file failed in Py3.9. Patch by Nick Pope. (Github issue :issue:3865)

  • The embedding code now reports Python errors as exit status.

  • Long type declarations could lead to (harmless) random changes in the C file when used in auto-generated Python wrappers or pickled classes.

  Other changes

  • ⚠ Variables defined as cpdef now generate a warning since this is currently useless and thus does not do what users would expect. Patch by David Woods. (Github issue :issue:3959)

  .. _0.29.21:

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