After manually removing petsc4py.PETSc.c in petsc4py-dev with petsc-dev I get
src/PETSc.c:3:28: error: petsc4py.PETSc.c: No such file or directory
cythonizing 'src/petsc4py.PETSc.pyx' source
Error converting Pyrex file to C:
------------------------------------------------------------
...
if o != NULL:
CHKERR( PetscObjectReference(o) )
obj.obj[0] = o
return obj
def __deepcopy__(self, dict memo not None):
^
------------------------------------------------------------
/Users/barrysmith/Src/petsc-dev/externalpackages/petsc4py/src/PETSc/Object.pyx:34:4:
Only extension type arguments can have 'not None'
make[1]: *** [petsc4py] Error 1
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