Rebuild for python38

[regro-cf-autotick-bot]

This PR has been triggered in an effort to update python38.

Notes and instructions for merging this PR:

1. Please merge the PR only after the tests have passed.
2. Feel free to push to the bot's branch to update this PR if needed. Please note that if you close this PR we presume that the feedstock has been rebuilt, so if you are going to perform the rebuild yourself don't close this PR until the your rebuild has been merged.

This package has the following downstream children: discretizer And potentially more. If this PR was opened in error or needs to be updated please add the bot-rerun label to this PR. The bot will close this PR and schedule another one.

_{This PR was created by the cf-regro-autotick-bot. The cf-regro-autotick-bot is a service to automatically track the dependency graph, migrate packages, and propose package version updates for conda-forge. If you would like a local version of this bot, you might consider using rever. Rever is a tool for automating software releases and forms the backbone of the bot's conda-forge PRing capability. Rever is both conda (conda install -c conda-forge rever) and pip (pip install re-ver) installable. Finally, feel free to drop us a line if there are any issues! This PR was generated by https://circleci.com/gh/regro/circle_worker/12056, please use this URL for debugging}

[conda-forge-linter]

Hi! This is the friendly automated conda-forge-linting service.

I just wanted to let you know that I linted all conda-recipes in your PR (recipe) and found it was in an excellent condition.

[ocefpaf]

Failing with:

=================================== FAILURES ===================================
____________________________ test_graphene_to_kwant ____________________________

    def test_graphene_to_kwant():

        norbs = OrderedDict([('A', 1), ('B', 1)])  # A and B atom per unit cell, one orbital each
        hopping_vectors = [('A', 'B', [1, 0])] # Hopping between neighbouring A and B atoms
        # Atomic coordinates within the unit cell
        atom_coords = [(0, 0), (1, 0)]
        # We set the interatom distance to 1, so the lattice vectors have length sqrt(3)
        lat_vecs = [(3/2, np.sqrt(3)/2), (3/2, -np.sqrt(3)/2)]

        # Time reversal
        TR = PointGroupElement(sympy.eye(2), True, False, np.eye(2))
        # Chiral symmetry
        C = PointGroupElement(sympy.eye(2), False, True, np.array([[1, 0], [0, -1]]))
        # Atom A rotates into A, B into B.
        sphi = 2*sympy.pi/3
        RC3 = sympy.Matrix([[sympy.cos(sphi), -sympy.sin(sphi)],
                          [sympy.sin(sphi), sympy.cos(sphi)]])
        C3 = PointGroupElement(RC3, False, False, np.eye(2))

        # Generate graphene Hamiltonian in Kwant from qsymm
        symmetries = [C, TR, C3]
        # Generate using a family
        family = bloch_family(hopping_vectors, symmetries, norbs)
>       syst_from_family = model_to_builder(family, norbs, lat_vecs, atom_coords, coeffs=None)

../_test_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_/lib/python3.7/site-packages/kwant/tests/test_qsymm.py:139: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
../_test_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_/lib/python3.7/site-packages/kwant/qsymm.py:343: in model_to_builder
    sublattices, coords_dict)
../_test_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_/lib/python3.7/site-packages/kwant/qsymm.py:276: in term_hopping
    hopping_dict[hop_dir] += Model({coeff: hop}, momenta=momenta)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 

self = {c0:
[[1.+0.j]],

}, other = {}

    def __radd__(self, other):
        # Addition of monomials with other types.

        # Useful for sum to work.
        if isinstance(other, Number) and other == 0:
            result = self.copy()
        elif ((isinstance(other, self.format) and self.shape == other.shape)
              or (isinstance(other, Number) and self.shape == ())):
            # Addition of constants
            result = self.copy()
            result[1] += other
        else:
>           raise NotImplementedError('Addition of {} with {} not supported'.format(type(self), type(other)))
E           NotImplementedError: Addition of <class 'qsymm.model.Model'> with <class 'dict'> not supported

[akhmerov]

@jbweston I forgot: would this be fixed by bumping the qsymm version?

[jbweston]

@akhmerov yes, AFAICT

[jbweston]

We should also fix this for all other released versions of Kwant

[akhmerov]

@conda-forge-admin please rerender

[regro-cf-autotick-bot]

Due to the bot-rerun label I'm closing this PR. I will make another one as appropriate. This was generated by https://circleci.com/gh/regro/circle_worker/13763

[regro-cf-autotick-bot]

Due to the bot-rerun label I'm closing this PR. I will make another one as appropriate. This was generated by https://circleci.com/gh/regro/circle_worker/13764