Unknown instruction 'LOAD_FAST_LOAD_FAST' with SciPy

[guyer]

https://dev.azure.com/guyer/FiPy/_build/results?buildId=1543

SyntaxError: Unknown instruction: Instruction(opname='LOAD_FAST_LOAD_FAST', opcode=88, ...

Traceback (most recent call last):
  File "/usr/share/miniconda/envs/myEnvironment/lib/python3.13/doctest.py", line 1395, in __run
    exec(compile(example.source, filename, "single",
    ~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
                 compileflags, True), test.globs)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "<doctest examples.elphf.diffusion.mesh1D[15]>", line 8, in <module>
    convectionCoeff = CkSum.faceGrad \
                      ~~~~~~~~~~~~~~~~
                      * (Cj.diffusivity / (1. - CkFaceSum))
                      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  File "/home/vsts/work/1/s/fipy/variables/variable.py", line 1120, in __mul__
    return self._BinaryOperatorVariable(lambda a, b: a*b, other)
           ~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/vsts/work/1/s/fipy/variables/variable.py", line 1083, in _BinaryOperatorVariable
    if not v.unit.isDimensionless() or len(v.shape) > 3:
           ^^^^^^
  File "/home/vsts/work/1/s/fipy/variables/variable.py", line 226, in _getUnit
    return self._extractUnit(self.value)
                             ^^^^^^^^^^
  File "/home/vsts/work/1/s/fipy/variables/variable.py", line 490, in _getValue
    value = self._calcValue()
  File "/home/vsts/work/1/s/fipy/variables/faceGradVariable.py", line 48, in _calcValue
    return self._calcValueNoInline()
           ~~~~~~~~~~~~~~~~~~~~~~~^^
  File "/home/vsts/work/1/s/fipy/variables/faceGradVariable.py", line 130, in _calcValueNoInline
    cellGrad = self.var.grad.numericValue
               ^^^^^^^^^^^^^
  File "/home/vsts/work/1/s/fipy/variables/cellVariable.py", line 233, in grad
    return self.gaussGrad
           ^^^^^^^^^^^^^^
  File "/home/vsts/work/1/s/fipy/variables/cellVariable.py", line 244, in gaussGrad
    self._gaussGrad = _GaussCellGradVariable(var = self, name = "%s_gauss_grad" % self.name)
                                                                                  ^^^^^^^^^
  File "/home/vsts/work/1/s/fipy/variables/operatorVariable.py", line 319, in _getName
    name = self._getRepresentation(style="name")
  File "/home/vsts/work/1/s/fipy/variables/binaryOperatorVariable.py", line 70, in _getRepresentation
    return "(" + operatorClass._getRepresentation(self, style=style, argDict=argDict, id=id, freshen=freshen) + ")"
                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/vsts/work/1/s/fipy/variables/operatorVariable.py", line 88, in _getRepresentation
    representation = self._py3kInstructions(op=self.op, style=style, argDict=argDict, id=id, freshen=freshen)
  File "/home/vsts/work/1/s/fipy/variables/operatorVariable.py", line 291, in _py3kInstructions
    raise SyntaxError("Unknown instruction: %s" % repr(ins))
SyntaxError: Unknown instruction: Instruction(opname='LOAD_FAST_LOAD_FAST', opcode=88, arg=1, argval=('a', 'b'), argrepr='a, b', offset=2, start_offset=2, starts_line=False, line_number=1101, label=None, positions=Positions(lineno=1101, end_lineno=1101, col_offset=61, end_col_offset=62), cache_info=None)

[guyer]

Always from _getRepresentation(), usually in gaussGrad

[guyer]

Just started failing nightly job (20250212.1) on all platforms, but only with SciPy solvers.

ubuntu

  - python=3.13.1=ha99a958_105_cp313
  - scipy=1.15.1=py313h750cbce_0

macOS

  - python=3.13.1=h2334245_105_cp313
  - scipy=1.15.1=py313h1cb6e1a_0

Windows

  - python=3.13.1=h071d269_105_cp313
  - scipy=1.15.1=py313hdc736f6_0

[guyer]

Worked the night before with

Ubuntu

  - python=3.12.8=h9e4cc4f_1_cpython
  - scipy=1.15.1=py312h180e4f1_0

macOS

  - python=3.12.8=h9ccd52b_1_cpython
  - scipy=1.15.1=py312hb4e66ee_0

Windows

  - python=3.12.8=h3f84c4b_1_cpython
  - scipy=1.15.1=py312h928f2a1_0

[guyer]

On failing build,

Ubuntu

PETSc

  - python=3.12.3=hab00c5b_0_cpython

Trilinos

  - python=3.7.12=hb7a2778_100_cpython

Of course. Trilinos and PySparse both pinned to older Python versions.

macOS

PETSc

  - python=3.12.3=h1411813_0_cpython

[guyer]

So, it's Python 3.13 that's causing the problem, and it's only coincidental that it's happening for FIPY_SOLVERS=scipy, because that's the only case that conda provides Python 3.13.