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| = Sage 9.4 Release Tour = current development cycle (2021) <<TableOfContents>> == Goals and tickets == * Add support for Python 3.10 * Add support for gcc 11 * Add support for macOS Big Sur that does not depend on homebrew's gcc@10 * packages upgrades - https://repology.org/projects/?inrepo=sagemath_develop - many upgrades enabled by dropping support for Python 3.6 * Drop support for optional packages with system gcc 4.x * [[https://trac.sagemath.org/query?status=needs_info&status=needs_review&status=needs_work&status=new&summary=~Meta&col=id&col=summary&col=status&col=type&col=priority&col=milestone&col=component&order=priority|Open Meta-Tickets]] * [[https://trac.sagemath.org/query?milestone=sage-9.4&groupdesc=1&group=status&max=1500&col=id&col=summary&col=author&col=reviewer&col=time&col=changetime&col=component&col=keywords&order=component|Trac tickets with milestone 9.4]] == Symbolics == === Extended interface with SymPy === The [[https://www.sympy.org/en/index.html|SymPy]] package has been updated to version 1.8. !SageMath has a bidirectional interface with !SymPy. Symbolic expressions in Sage provide a `_sympy_` method, which converts to !SymPy; also, Sage attaches `_sage_` methods to various SymPy classes, which provide the opposite conversion. In Sage 9.4, several conversions have been added. Now there is a bidirectional interface as well for matrices and vectors [[https://trac.sagemath.org/ticket/31942|#31942]]. {{{ sage: M = matrix([[sin(x), cos(x)], [-cos(x), sin(x)]]); M [ sin(x) cos(x)] [-cos(x) sin(x)] sage: sM = M._sympy_(); sM Matrix([ [ sin(x), cos(x)], [-cos(x), sin(x)]]) sage: sM.subs(x, pi/4) # computation in SymPy Matrix([ [ sqrt(2)/2, sqrt(2)/2], [-sqrt(2)/2, sqrt(2)/2]]) }}} Work is underway to make !SymPy's symbolic linear algebra methods available in Sage via this route. All sets and algebraic structures (`Parent`s) of !SageMath are now accessible to !SymPy by way of a wrapper class, which implements the [[https://docs.sympy.org/latest/modules/sets.html#set|SymPy Set API]]. [[https://trac.sagemath.org/ticket/31938|#31938]] {{{ sage: F = Family([2, 3, 5, 7]); F Family (2, 3, 5, 7) sage: sF = F._sympy_(); sF SageSet(Family (2, 3, 5, 7)) # this is how the wrapper prints sage: sF._sage_() is F True # bidirectional sage: bool(sF) True sage: len(sF) 4 sage: sF.is_finite_set # SymPy property True }}} Finite or infinite, we can wrap it: {{{ sage: W = WeylGroup(["A",1,1]) sage: sW = W._sympy_(); sW SageSet(Weyl Group of type ['A', 1, 1] (as a matrix group acting on the root space)) sage: sW.is_finite_set False sage: sW.is_iterable True sage: sB3 = WeylGroup(["B", 3])._sympy_(); sB3 SageSet(Weyl Group of type ['B', 3] (as a matrix group acting on the ambient space)) sage: len(sB3) 48 }}} Some parents or constructions have a more specific conversion to !SymPy [[https://trac.sagemath.org/ticket/31931|#31931]]. {{{ sage: ZZ3 = cartesian_product([ZZ, ZZ, ZZ]) sage: sZZ3 = ZZ3._sympy_(); sZZ3 ProductSet(Integers, Integers, Integers) sage: (1, 2, 3) in sZZ3 sage: NN = NonNegativeIntegers() sage: NN._sympy_() Naturals0 sage: (RealSet(1, 2).union(RealSet.closed(3, 4)))._sympy_() Union(Interval.open(1, 2), Interval(3, 4)) }}} See [[https://trac.sagemath.org/ticket/31926|Meta-ticket #31926: Connect Sage sets to SymPy sets]] == Configuration changes == * Drop support for system Python 3.6 (deprecated in Sage 9.3). [[https://trac.sagemath.org/ticket/30551|#30551]] It is still possible to build the Sage distribution on systems with old Python versions, but Sage will build its own copy of Python 3.9.x in this case. == Availability of Sage 9.4 and installation help == The first beta of the 9.4 series, 9.4.beta0, was tagged on 2021-05-26. * See [[https://groups.google.com/forum/#!forum/sage-devel|sage-devel]] for development discussions and [[https://groups.google.com/forum/#!forum/sage-release|sage-release]] for announcements of beta versions and release candidates. |
