Missing dof_indices method of DirichletBC in python

[twmr]

Summarize the issue

I noticed that while upgrading dolfinx from 0.6.2 to 0.7.0 that there is no longer a dof_indices method for the dolfinx.fem.bcs.DirichletBC class. I couldn't find anything related in the release notes of 0.7.0.
In 0.7.0 there seems to be a single unit-test that calls the dof_indices method, but this test was removed later (in #2820).

debugging my code with dolfinx 0.6.2:

(Pdb) p bcs[0]
<dolfinx.fem.bcs.DirichletBC object at 0x72af6bee1ad0>
(Pdb) p dir(bcs[0])
['__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', 'dof_indices', 'dtype', 'function_space', 'g', 'value']
(Pdb) p bcs[0].dof_indices
<bound method PyCapsule.dof_indices of <dolfinx.fem.bcs.DirichletBC object at 0x72af6bee1ad0>>

debugging my code with dolfinx 0.7.0:

(Pdb) p bcs[0]
<dolfinx.fem.bcs.DirichletBC object at 0x7acbd3d24dd0>
(Pdb) p bcs[0].function_space
<dolfinx.cpp.fem.FunctionSpace_float64 object at 0x7acbe0ddc530>
(Pdb) p dir(bcs[0])
['__class__', '__delattr__', '__dict__', '__dir__', '__doc__', '__eq__', '__format__', '__ge__', '__getattribute__', '__getstate__', '__gt__', '__hash__', '__init__', '__init_subclass__', '__le__', '__lt__', '__module__', '__ne__', '__new__', '__reduce__', '__reduce_ex__', '__repr__', '__setattr__', '__sizeof__', '__str__', '__subclasshook__', '__weakref__', '_cpp_object', 'function_space', 'g']

You can see that 0.7.0 no longer has the dof_indices, dtype and value methods/attributes. Is this on purpose?
Am I missing anything?

How to reproduce the bug

see script below

Minimal Example (Python)

import numpy as np
import ufl
from dolfinx import fem, mesh
from mpi4py import MPI
from petsc4py import PETSc

msh = mesh.create_unit_interval(MPI.COMM_WORLD, nx=1000)

V = fem.FunctionSpace(msh, ("Lagrange", 3))

ds_obc = ufl.ds
bcs_dofs = fem.locate_dofs_geometrical(
    V,
    lambda x: np.isclose(x[0], 0.0),
)

bc = fem.dirichletbc(PETSc.ScalarType(0), bcs_dofs, V)
print(bc)
print(bc.dof_indices())

Output (Python)

$ pixi run python repr.py                                                                                                                  <dolfinx.fem.bcs.DirichletBC object at 0x7fd328936110>
Traceback (most recent call last):
  File "/home/thomas/repr.py", line 19, in <module>
    print(bc.dof_indices())
          ^^^^^^^^^^^^^^
AttributeError: 'DirichletBC' object has no attribute 'dof_indices'

Version

0.7.0

DOLFINx git commit

No response

Installation

conda linux-64 env

Additional information

No response

[twmr]

As a workaround, it is possible to call the dof_indices method on the private _cpp_object attribute:

(tested in dolfinx 0.7.3)

In [2]: bc._cpp_object
Out[2]: <dolfinx.cpp.fem.DirichletBC_complex128 at 0x70fe740d7730>

In [3]: bc._cpp_object.dof_indices()
Out[3]: (array([0], dtype=int32), 1)