build/pkgs/mathics: Reduce to a pip package

build/pkgs/mathics/dependencies

@@ -1,4 +1,4 @@
- | $(PYTHON_TOOLCHAIN) pint palettable mathics_scanner $(PYTHON)
+numpy pillow mpmath dateutil requests sympy pyyaml charset_normalizer typing_extensions | $(PYTHON_TOOLCHAIN) $(PYTHON)
 
 ----------
 All lines of this file are ignored except the first.

build/pkgs/mathics/requirements.txt

@@ -0,0 +1,2 @@
+Mathics3 @ git+https://github.com/Mathics3/mathics-core
+-c ${SAGE_VENV}/var/lib/sage/scripts/numpy/spkg-requirements.txt

src/sage/doctest/external.py

@@ -398,6 +398,7 @@ class AvailableSoftware():
          'magma',
          'maple',
          'mathematica',
+         'mathics',
          'matlab',
          'octave',
          'pdflatex',

src/sage/features/interfaces.py

@@ -91,6 +91,23 @@ def _is_present(self):
                                      reason=f"Interface {interface} is not functional: {exception}")
 
 
+class Mathics(InterfaceFeature):
+    r"""
+    A :class:`~sage.features.Feature` describing whether :class:`sage.interfaces.mathics.Mathics`
+    is present and functional.
+
+    EXAMPLES::
+
+        sage: from sage.features.interfaces import Mathics
+        sage: Mathics().is_present()  # not tested
+        FeatureTestResult('mathics', False)
+    """
+
+    @staticmethod
+    def __classcall__(cls):
+        return InterfaceFeature.__classcall__(cls, 'mathics', 'sage.interfaces.mathics')
+
+
 # The following are provided by external software only (no SPKG)
 
 class Magma(InterfaceFeature):
@@ -223,6 +240,7 @@ def all_features():
         [Feature('magma'),
          Feature('matlab'),
          Feature('mathematica'),
+         Feature('mathics'),
          Feature('maple'),
          Feature('macaulay2'),
          Feature('octave'),
@@ -231,6 +249,7 @@ def all_features():
     return [Magma(),
             Matlab(),
             Mathematica(),
+            Mathics(),
             Maple(),
             Macaulay2(),
             Octave(),

src/sage/interfaces/mathics.py

@@ -512,6 +512,8 @@
         """
         if not self._session:
             from mathics.session import MathicsSession
+            from mathics.core.load_builtin import import_and_load_builtins
+            import_and_load_builtins()
             self._session = MathicsSession()
             from sage.interfaces.sympy import sympy_init
             sympy_init()

src/sage/libs/mpmath/ext_main.pyx

@@ -1815,7 +1815,7 @@ cdef class mpf_base(mpnumber):
             sage: X().to_fixed(30)
             3489660928
         """
-        return libmp.to_fixed(self._mpf_, prec)
+        return libmp.to_fixed(self._mpf_, prec)    
 
     def __getstate__(self):
         return libmp.to_pickable(self._mpf_)
@@ -2135,6 +2135,9 @@ cdef class mpf(mpf_base):
         MPF_sqrt(&r.value, &s.value, global_opts)
         return r
 
+    def __round__(self, *args):
+        return round(float(self), *args)
+
     def __richcmp__(self, other, int op):
         """
         Compares numbers ::