diff --git a/src/sage/geometry/polyhedron/combinatorial_polyhedron/base.pxd b/src/sage/geometry/polyhedron/combinatorial_polyhedron/base.pxd
index 85a020df78a..61814b4f538 100644
--- a/src/sage/geometry/polyhedron/combinatorial_polyhedron/base.pxd
+++ b/src/sage/geometry/polyhedron/combinatorial_polyhedron/base.pxd
@@ -1,10 +1,10 @@
 cimport cython
 from sage.data_structures.list_of_pairs cimport ListOfPairs
 from sage.structure.sage_object         cimport SageObject
-from .face_iterator                     cimport FaceIterator, CombinatorialFace
-from .list_of_faces                     cimport ListOfFaces
-from .face_data_structure               cimport face_t
-from .polyhedron_face_lattice           cimport PolyhedronFaceLattice
+from sage.geometry.polyhedron.combinatorial_polyhedron.face_iterator                     cimport FaceIterator, CombinatorialFace
+from sage.geometry.polyhedron.combinatorial_polyhedron.list_of_faces                     cimport ListOfFaces
+from sage.geometry.polyhedron.combinatorial_polyhedron.face_data_structure               cimport face_t
+from sage.geometry.polyhedron.combinatorial_polyhedron.polyhedron_face_lattice           cimport PolyhedronFaceLattice
 
 @cython.final
 cdef class CombinatorialPolyhedron(SageObject):
diff --git a/src/sage/geometry/polyhedron/combinatorial_polyhedron/base.pyx b/src/sage/geometry/polyhedron/combinatorial_polyhedron/base.pyx
index 8282fbbd1ca..11148d13a83 100644
--- a/src/sage/geometry/polyhedron/combinatorial_polyhedron/base.pyx
+++ b/src/sage/geometry/polyhedron/combinatorial_polyhedron/base.pyx
@@ -98,14 +98,14 @@ from .conversions \
                incidence_matrix_to_bit_rep_of_Vrep, \
                facets_tuple_to_bit_rep_of_facets, \
                facets_tuple_to_bit_rep_of_Vrep
-from .conversions cimport Vrep_list_to_bit_rep
+from sage.geometry.polyhedron.combinatorial_polyhedron.conversions cimport Vrep_list_to_bit_rep
 from sage.misc.cachefunc            import cached_method
 
 from sage.rings.integer                cimport smallInteger
 from cysignals.signals                 cimport sig_check
 
-from .face_data_structure cimport face_len_atoms, face_init, face_free
-from .face_iterator cimport iter_t, parallel_f_vector
+from sage.geometry.polyhedron.combinatorial_polyhedron.face_data_structure cimport face_len_atoms, face_init, face_free
+from sage.geometry.polyhedron.combinatorial_polyhedron.face_iterator cimport iter_t, parallel_f_vector
 
 
 cdef extern from "Python.h":
diff --git a/src/sage/geometry/polyhedron/combinatorial_polyhedron/combinatorial_face.pxd b/src/sage/geometry/polyhedron/combinatorial_polyhedron/combinatorial_face.pxd
index 2169fe539f6..e65f8eb678b 100644
--- a/src/sage/geometry/polyhedron/combinatorial_polyhedron/combinatorial_face.pxd
+++ b/src/sage/geometry/polyhedron/combinatorial_polyhedron/combinatorial_face.pxd
@@ -1,8 +1,8 @@
 cimport cython
 from sage.structure.sage_object cimport SageObject
-from .list_of_faces             cimport ListOfFaces
-from .face_data_structure       cimport face_t
-from .face_iterator             cimport FaceIterator
+from sage.geometry.polyhedron.combinatorial_polyhedron.list_of_faces             cimport ListOfFaces
+from sage.geometry.polyhedron.combinatorial_polyhedron.face_data_structure       cimport face_t
+from sage.geometry.polyhedron.combinatorial_polyhedron.face_iterator             cimport FaceIterator
 
 @cython.final
 cdef class CombinatorialFace(SageObject):
diff --git a/src/sage/geometry/polyhedron/combinatorial_polyhedron/combinatorial_face.pyx b/src/sage/geometry/polyhedron/combinatorial_polyhedron/combinatorial_face.pyx
index 541927c6c11..5e5b2dfd992 100644
--- a/src/sage/geometry/polyhedron/combinatorial_polyhedron/combinatorial_face.pyx
+++ b/src/sage/geometry/polyhedron/combinatorial_polyhedron/combinatorial_face.pyx
@@ -68,13 +68,13 @@ from cysignals.memory           cimport check_allocarray, sig_free
 
 import numbers
 from sage.rings.integer         cimport smallInteger
-from .conversions               cimport bit_rep_to_Vrep_list
-from .base                      cimport CombinatorialPolyhedron
-from .face_iterator             cimport FaceIterator_base, FaceStatus
-from .polyhedron_face_lattice   cimport PolyhedronFaceLattice
-from .face_data_structure       cimport face_len_atoms, face_init, face_free, face_copy, face_issubset
-from .face_list_data_structure  cimport bit_rep_to_coatom_rep
-from .list_of_faces              cimport face_as_combinatorial_polyhedron
+from sage.geometry.polyhedron.combinatorial_polyhedron.conversions               cimport bit_rep_to_Vrep_list
+from sage.geometry.polyhedron.combinatorial_polyhedron.base                      cimport CombinatorialPolyhedron
+from sage.geometry.polyhedron.combinatorial_polyhedron.face_iterator             cimport FaceIterator_base, FaceStatus
+from sage.geometry.polyhedron.combinatorial_polyhedron.polyhedron_face_lattice   cimport PolyhedronFaceLattice
+from sage.geometry.polyhedron.combinatorial_polyhedron.face_data_structure       cimport face_len_atoms, face_init, face_free, face_copy, face_issubset
+from sage.geometry.polyhedron.combinatorial_polyhedron.face_list_data_structure  cimport bit_rep_to_coatom_rep
+from sage.geometry.polyhedron.combinatorial_polyhedron.list_of_faces              cimport face_as_combinatorial_polyhedron
 
 
 cdef extern from "Python.h":
diff --git a/src/sage/geometry/polyhedron/combinatorial_polyhedron/conversions.pxd b/src/sage/geometry/polyhedron/combinatorial_polyhedron/conversions.pxd
index 82ac7f6dcb8..2a0e950b469 100644
--- a/src/sage/geometry/polyhedron/combinatorial_polyhedron/conversions.pxd
+++ b/src/sage/geometry/polyhedron/combinatorial_polyhedron/conversions.pxd
@@ -1,4 +1,5 @@
-from .face_list_data_structure cimport face_t
+from sage.geometry.polyhedron.combinatorial_polyhedron.face_list_data_structure cimport face_t
+
 
 cdef int Vrep_list_to_bit_rep(tuple Vrep_list, face_t output) except -1
 
diff --git a/src/sage/geometry/polyhedron/combinatorial_polyhedron/conversions.pyx b/src/sage/geometry/polyhedron/combinatorial_polyhedron/conversions.pyx
index baeb8fc4855..26aa92a6575 100644
--- a/src/sage/geometry/polyhedron/combinatorial_polyhedron/conversions.pyx
+++ b/src/sage/geometry/polyhedron/combinatorial_polyhedron/conversions.pyx
@@ -72,8 +72,8 @@ from memory_allocator                 cimport MemoryAllocator
 
 from sage.matrix.matrix_dense cimport Matrix_dense
 
-from .list_of_faces                   cimport ListOfFaces
-from .face_data_structure             cimport face_next_atom, face_add_atom_safe, facet_set_coatom, face_clear
+from sage.geometry.polyhedron.combinatorial_polyhedron.list_of_faces                   cimport ListOfFaces
+from sage.geometry.polyhedron.combinatorial_polyhedron.face_data_structure             cimport face_next_atom, face_add_atom_safe, facet_set_coatom, face_clear
 
 cdef extern from "Python.h":
     int unlikely(int) nogil  # Defined by Cython
diff --git a/src/sage/geometry/polyhedron/combinatorial_polyhedron/face_iterator.pxd b/src/sage/geometry/polyhedron/combinatorial_polyhedron/face_iterator.pxd
index f148c81f7a9..c906ddb51cc 100644
--- a/src/sage/geometry/polyhedron/combinatorial_polyhedron/face_iterator.pxd
+++ b/src/sage/geometry/polyhedron/combinatorial_polyhedron/face_iterator.pxd
@@ -1,9 +1,9 @@
 cimport cython
 from sage.structure.sage_object cimport SageObject
-from .list_of_faces             cimport ListOfFaces
-from .face_data_structure       cimport face_t
-from .face_list_data_structure  cimport face_list_t
-from .combinatorial_face        cimport CombinatorialFace
+from sage.geometry.polyhedron.combinatorial_polyhedron.list_of_faces             cimport ListOfFaces
+from sage.geometry.polyhedron.combinatorial_polyhedron.face_data_structure       cimport face_t
+from sage.geometry.polyhedron.combinatorial_polyhedron.face_list_data_structure  cimport face_list_t
+from sage.geometry.polyhedron.combinatorial_polyhedron.combinatorial_face        cimport CombinatorialFace
 
 cdef enum FaceStatus:
     NOT_INITIALIZED
diff --git a/src/sage/geometry/polyhedron/combinatorial_polyhedron/face_iterator.pyx b/src/sage/geometry/polyhedron/combinatorial_polyhedron/face_iterator.pyx
index d35033fc855..734745c6b8e 100644
--- a/src/sage/geometry/polyhedron/combinatorial_polyhedron/face_iterator.pyx
+++ b/src/sage/geometry/polyhedron/combinatorial_polyhedron/face_iterator.pyx
@@ -176,14 +176,13 @@ AUTHOR:
 
 from cython.parallel cimport prange, threadid
 from cysignals.memory cimport check_allocarray, sig_free
+from cysignals.signals cimport sig_check
 from memory_allocator cimport MemoryAllocator
 
-from cysignals.signals      cimport sig_check
-from .conversions           cimport bit_rep_to_Vrep_list
-from .base                  cimport CombinatorialPolyhedron
-
+from sage.geometry.polyhedron.combinatorial_polyhedron.base cimport CombinatorialPolyhedron
+from sage.geometry.polyhedron.combinatorial_polyhedron.conversions cimport bit_rep_to_Vrep_list
+from sage.geometry.polyhedron.combinatorial_polyhedron.face_list_data_structure cimport *
 from sage.geometry.polyhedron.face import combinatorial_face_to_polyhedral_face, PolyhedronFace
-from .face_list_data_structure cimport *
 
 
 cdef extern from "Python.h":
diff --git a/src/sage/geometry/polyhedron/combinatorial_polyhedron/face_list_data_structure.pxd b/src/sage/geometry/polyhedron/combinatorial_polyhedron/face_list_data_structure.pxd
index 105cc81b9a4..9867675fbec 100644
--- a/src/sage/geometry/polyhedron/combinatorial_polyhedron/face_list_data_structure.pxd
+++ b/src/sage/geometry/polyhedron/combinatorial_polyhedron/face_list_data_structure.pxd
@@ -14,7 +14,7 @@ Inline cython methods for lists of faces.
 cdef extern from "Python.h":
     int unlikely(int) nogil  # Defined by Cython
 
-from .face_data_structure             cimport *
+from sage.geometry.polyhedron.combinatorial_polyhedron.face_data_structure             cimport *
 from libc.string                      cimport memset
 from cysignals.signals                cimport sig_check
 from cysignals.memory                 cimport check_allocarray, check_calloc, sig_free
diff --git a/src/sage/geometry/polyhedron/combinatorial_polyhedron/list_of_faces.pxd b/src/sage/geometry/polyhedron/combinatorial_polyhedron/list_of_faces.pxd
index d50c8f85539..d994f78ebec 100644
--- a/src/sage/geometry/polyhedron/combinatorial_polyhedron/list_of_faces.pxd
+++ b/src/sage/geometry/polyhedron/combinatorial_polyhedron/list_of_faces.pxd
@@ -1,5 +1,5 @@
 cimport cython
-from .face_list_data_structure cimport face_list_t, face_t
+from sage.geometry.polyhedron.combinatorial_polyhedron.face_list_data_structure cimport face_list_t, face_t
 
 @cython.final
 cdef class ListOfFaces:
diff --git a/src/sage/geometry/polyhedron/combinatorial_polyhedron/list_of_faces.pyx b/src/sage/geometry/polyhedron/combinatorial_polyhedron/list_of_faces.pyx
index 9b5f3dd4ada..59e72afad65 100644
--- a/src/sage/geometry/polyhedron/combinatorial_polyhedron/list_of_faces.pyx
+++ b/src/sage/geometry/polyhedron/combinatorial_polyhedron/list_of_faces.pyx
@@ -92,7 +92,7 @@ AUTHOR:
 
 from sage.matrix.matrix_dense  cimport Matrix_dense
 
-from .face_list_data_structure cimport *
+from sage.geometry.polyhedron.combinatorial_polyhedron.face_list_data_structure cimport *
 
 cdef extern from "Python.h":
     int unlikely(int) nogil  # Defined by Cython
diff --git a/src/sage/geometry/polyhedron/combinatorial_polyhedron/polyhedron_face_lattice.pxd b/src/sage/geometry/polyhedron/combinatorial_polyhedron/polyhedron_face_lattice.pxd
index 438dc8de6f7..2cfd863835e 100644
--- a/src/sage/geometry/polyhedron/combinatorial_polyhedron/polyhedron_face_lattice.pxd
+++ b/src/sage/geometry/polyhedron/combinatorial_polyhedron/polyhedron_face_lattice.pxd
@@ -1,8 +1,8 @@
 cimport cython
-from .list_of_faces             cimport ListOfFaces
-from .face_data_structure       cimport face_t
-from .face_list_data_structure  cimport face_list_t
-from .combinatorial_face        cimport CombinatorialFace
+from sage.geometry.polyhedron.combinatorial_polyhedron.list_of_faces             cimport ListOfFaces
+from sage.geometry.polyhedron.combinatorial_polyhedron.face_data_structure       cimport face_t
+from sage.geometry.polyhedron.combinatorial_polyhedron.face_list_data_structure  cimport face_list_t
+from sage.geometry.polyhedron.combinatorial_polyhedron.combinatorial_face        cimport CombinatorialFace
 
 @cython.final
 cdef class PolyhedronFaceLattice:
diff --git a/src/sage/geometry/polyhedron/combinatorial_polyhedron/polyhedron_face_lattice.pyx b/src/sage/geometry/polyhedron/combinatorial_polyhedron/polyhedron_face_lattice.pyx
index 9f5a98c7ece..8ba0b7edc1d 100644
--- a/src/sage/geometry/polyhedron/combinatorial_polyhedron/polyhedron_face_lattice.pyx
+++ b/src/sage/geometry/polyhedron/combinatorial_polyhedron/polyhedron_face_lattice.pyx
@@ -64,11 +64,11 @@ from .conversions \
         import facets_tuple_to_bit_rep_of_facets, \
                facets_tuple_to_bit_rep_of_Vrep
 
-from .conversions cimport bit_rep_to_Vrep_list
+from sage.geometry.polyhedron.combinatorial_polyhedron.conversions cimport bit_rep_to_Vrep_list
 
-from .base                     cimport CombinatorialPolyhedron
-from .face_iterator            cimport FaceIterator
-from .face_list_data_structure cimport *
+from sage.geometry.polyhedron.combinatorial_polyhedron.base                     cimport CombinatorialPolyhedron
+from sage.geometry.polyhedron.combinatorial_polyhedron.face_iterator            cimport FaceIterator
+from sage.geometry.polyhedron.combinatorial_polyhedron.face_list_data_structure cimport *
 
 
 cdef extern from "Python.h":
diff --git a/src/sage/geometry/triangulation/base.pyx b/src/sage/geometry/triangulation/base.pyx
index cbb1673d0f2..61014429fdd 100644
--- a/src/sage/geometry/triangulation/base.pyx
+++ b/src/sage/geometry/triangulation/base.pyx
@@ -27,8 +27,8 @@ from sage.structure.parent cimport Parent
 from sage.categories.sets_cat import Sets
 from sage.matrix.constructor import matrix
 
-from .functions cimport binomial
-from .triangulations cimport \
+from sage.geometry.triangulation.functions cimport binomial
+from sage.geometry.triangulation.triangulations cimport \
     triangulations_ptr, init_triangulations, next_triangulation, delete_triangulations
 
 
diff --git a/src/sage/groups/matrix_gps/group_element.pyx b/src/sage/groups/matrix_gps/group_element.pyx
index d95fa0aa086..fa914a9499d 100644
--- a/src/sage/groups/matrix_gps/group_element.pyx
+++ b/src/sage/groups/matrix_gps/group_element.pyx
@@ -84,7 +84,7 @@ from sage.structure.richcmp cimport richcmp
 
 
 try:
-    from .group_element_gap import MatrixGroupElement_gap
+    from sage.groups.matrix_gps.group_element_gap import MatrixGroupElement_gap
 except ImportError:
     MatrixGroupElement_gap = ()
 
diff --git a/src/sage/groups/perm_gps/partn_ref/automorphism_group_canonical_label.pxd b/src/sage/groups/perm_gps/partn_ref/automorphism_group_canonical_label.pxd
index 573eeb83f58..52f75a3df9c 100644
--- a/src/sage/groups/perm_gps/partn_ref/automorphism_group_canonical_label.pxd
+++ b/src/sage/groups/perm_gps/partn_ref/automorphism_group_canonical_label.pxd
@@ -8,7 +8,7 @@
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 
-from .data_structures cimport *
+from sage.groups.perm_gps.partn_ref.data_structures cimport *
 from sage.data_structures.bitset cimport bitset_t
 from sage.rings.integer cimport Integer
 
diff --git a/src/sage/groups/perm_gps/partn_ref/automorphism_group_canonical_label.pyx b/src/sage/groups/perm_gps/partn_ref/automorphism_group_canonical_label.pyx
index 920ff69c3df..803f2533b7d 100644
--- a/src/sage/groups/perm_gps/partn_ref/automorphism_group_canonical_label.pyx
+++ b/src/sage/groups/perm_gps/partn_ref/automorphism_group_canonical_label.pyx
@@ -113,7 +113,7 @@ REFERENCE:
 from libc.string cimport memcmp, memcpy
 from cysignals.memory cimport sig_malloc, sig_realloc, sig_free
 
-from .data_structures cimport *
+from sage.groups.perm_gps.partn_ref.data_structures cimport *
 from sage.data_structures.bitset_base cimport *
 
 cdef inline int agcl_cmp(int a, int b) noexcept:
diff --git a/src/sage/groups/perm_gps/partn_ref/canonical_augmentation.pxd b/src/sage/groups/perm_gps/partn_ref/canonical_augmentation.pxd
index daa7a59b2b6..49e2f3cdbde 100644
--- a/src/sage/groups/perm_gps/partn_ref/canonical_augmentation.pxd
+++ b/src/sage/groups/perm_gps/partn_ref/canonical_augmentation.pxd
@@ -17,13 +17,13 @@ AUTHORS:
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 
-from .data_structures cimport *
+from sage.groups.perm_gps.partn_ref.data_structures cimport *
 
-from .automorphism_group_canonical_label cimport (
+from sage.groups.perm_gps.partn_ref.automorphism_group_canonical_label cimport (
     get_aut_gp_and_can_lab, aut_gp_and_can_lab, agcl_work_space,
     allocate_agcl_output, deallocate_agcl_output,
     allocate_agcl_work_space, deallocate_agcl_work_space)
-from .double_coset cimport (double_coset,
+from sage.groups.perm_gps.partn_ref.double_coset cimport (double_coset,
     dc_work_space, allocate_dc_work_space, deallocate_dc_work_space)
 
 
diff --git a/src/sage/groups/perm_gps/partn_ref/canonical_augmentation.pyx b/src/sage/groups/perm_gps/partn_ref/canonical_augmentation.pyx
index a8a25050413..6143e509caa 100644
--- a/src/sage/groups/perm_gps/partn_ref/canonical_augmentation.pyx
+++ b/src/sage/groups/perm_gps/partn_ref/canonical_augmentation.pyx
@@ -169,7 +169,7 @@ REFERENCE:
 
 from cysignals.memory cimport sig_malloc, sig_free
 
-from .data_structures cimport*
+from sage.groups.perm_gps.partn_ref.data_structures cimport*
 
 
 cdef void *canonical_generator_next(void *can_gen_data, int *degree, bint *mem_err) noexcept:
diff --git a/src/sage/groups/perm_gps/partn_ref/double_coset.pxd b/src/sage/groups/perm_gps/partn_ref/double_coset.pxd
index 1ca972a8e33..6c5d9e0f279 100644
--- a/src/sage/groups/perm_gps/partn_ref/double_coset.pxd
+++ b/src/sage/groups/perm_gps/partn_ref/double_coset.pxd
@@ -8,7 +8,7 @@
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 
-from .data_structures cimport *
+from sage.groups.perm_gps.partn_ref.data_structures cimport *
 from sage.data_structures.bitset cimport bitset_t
 from sage.rings.integer cimport Integer
 
diff --git a/src/sage/groups/perm_gps/partn_ref/double_coset.pyx b/src/sage/groups/perm_gps/partn_ref/double_coset.pyx
index b29abddd20a..873199ce380 100644
--- a/src/sage/groups/perm_gps/partn_ref/double_coset.pyx
+++ b/src/sage/groups/perm_gps/partn_ref/double_coset.pyx
@@ -96,7 +96,7 @@ REFERENCE:
 
 from cysignals.memory cimport sig_calloc
 
-from .data_structures cimport *
+from sage.groups.perm_gps.partn_ref.data_structures cimport *
 from sage.data_structures.bitset_base cimport *
 
 # Functions
diff --git a/src/sage/groups/perm_gps/partn_ref/refinement_binary.pxd b/src/sage/groups/perm_gps/partn_ref/refinement_binary.pxd
index a06c9fc8532..4af69f4b5f5 100644
--- a/src/sage/groups/perm_gps/partn_ref/refinement_binary.pxd
+++ b/src/sage/groups/perm_gps/partn_ref/refinement_binary.pxd
@@ -8,9 +8,9 @@
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 
-from .data_structures cimport *
+from sage.groups.perm_gps.partn_ref.data_structures cimport *
 
-from .automorphism_group_canonical_label cimport (
+from sage.groups.perm_gps.partn_ref.automorphism_group_canonical_label cimport (
     get_aut_gp_and_can_lab, aut_gp_and_can_lab, agcl_work_space,
     allocate_agcl_output, deallocate_agcl_output,
     allocate_agcl_work_space, deallocate_agcl_work_space)
diff --git a/src/sage/groups/perm_gps/partn_ref/refinement_binary.pyx b/src/sage/groups/perm_gps/partn_ref/refinement_binary.pyx
index 6339dbbd2e5..6a3c07ac75d 100644
--- a/src/sage/groups/perm_gps/partn_ref/refinement_binary.pyx
+++ b/src/sage/groups/perm_gps/partn_ref/refinement_binary.pyx
@@ -28,10 +28,10 @@ REFERENCE:
 #*****************************************************************************
 
 from sage.data_structures.bitset_base cimport *
-from .data_structures cimport *
+from sage.groups.perm_gps.partn_ref.data_structures cimport *
 from sage.rings.integer cimport Integer
 from sage.structure.element import is_Matrix
-from .double_coset cimport double_coset
+from sage.groups.perm_gps.partn_ref.double_coset cimport double_coset
 
 
 cdef class LinearBinaryCodeStruct(BinaryCodeStruct):
diff --git a/src/sage/groups/perm_gps/partn_ref/refinement_graphs.pxd b/src/sage/groups/perm_gps/partn_ref/refinement_graphs.pxd
index f26580d3010..464ddde015d 100644
--- a/src/sage/groups/perm_gps/partn_ref/refinement_graphs.pxd
+++ b/src/sage/groups/perm_gps/partn_ref/refinement_graphs.pxd
@@ -8,17 +8,17 @@
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 
-from .data_structures cimport *
+from sage.groups.perm_gps.partn_ref.data_structures cimport *
 from sage.graphs.base.c_graph cimport CGraph
-from .automorphism_group_canonical_label cimport (
+from sage.groups.perm_gps.partn_ref.automorphism_group_canonical_label cimport (
     get_aut_gp_and_can_lab, aut_gp_and_can_lab, agcl_work_space,
     allocate_agcl_output, deallocate_agcl_output,
     allocate_agcl_work_space, deallocate_agcl_work_space)
-from .canonical_augmentation cimport (iterator,
+from sage.groups.perm_gps.partn_ref.canonical_augmentation cimport (iterator,
     canonical_generator_data, allocate_cgd, deallocate_cgd,
     canonical_generator_next,
     setup_canonical_generator, start_canonical_generator)
-from .refinement_sets cimport (subset, free_subset, all_set_children_are_equivalent,
+from sage.groups.perm_gps.partn_ref.refinement_sets cimport (subset, free_subset, all_set_children_are_equivalent,
     refine_set, compare_sets, generate_child_subsets, apply_subset_aug,
     canonical_set_parent, allocate_sgd, deallocate_sgd, allocate_subset_gen, free_subset_gen,
     setup_set_gen, subset_generator_next, subset_generator_data, allocate_subset_gen_2)
diff --git a/src/sage/groups/perm_gps/partn_ref/refinement_graphs.pyx b/src/sage/groups/perm_gps/partn_ref/refinement_graphs.pyx
index 83c91f3296d..1b588487d1c 100644
--- a/src/sage/groups/perm_gps/partn_ref/refinement_graphs.pyx
+++ b/src/sage/groups/perm_gps/partn_ref/refinement_graphs.pyx
@@ -20,12 +20,12 @@ REFERENCE:
 #                  https://www.gnu.org/licenses/
 # ****************************************************************************
 
-from .data_structures cimport *
+from sage.groups.perm_gps.partn_ref.data_structures cimport *
 from sage.data_structures.bitset_base cimport *
 from sage.rings.integer cimport Integer
 from sage.graphs.base.sparse_graph cimport SparseGraph
 from sage.graphs.base.dense_graph cimport DenseGraph, copy_dense_graph
-from .double_coset cimport double_coset
+from sage.groups.perm_gps.partn_ref.double_coset cimport double_coset
 
 
 def isomorphic(G1, G2, partn, ordering2, dig, use_indicator_function, sparse=False):
diff --git a/src/sage/groups/perm_gps/partn_ref/refinement_lists.pxd b/src/sage/groups/perm_gps/partn_ref/refinement_lists.pxd
index faabab4024e..e7b6cf42f6d 100644
--- a/src/sage/groups/perm_gps/partn_ref/refinement_lists.pxd
+++ b/src/sage/groups/perm_gps/partn_ref/refinement_lists.pxd
@@ -9,7 +9,7 @@
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 
-from .data_structures cimport *
+from sage.groups.perm_gps.partn_ref.data_structures cimport *
 
 
 # name of the three functions to customize
diff --git a/src/sage/groups/perm_gps/partn_ref/refinement_lists.pyx b/src/sage/groups/perm_gps/partn_ref/refinement_lists.pyx
index 462f96bef00..00365bcbd3c 100644
--- a/src/sage/groups/perm_gps/partn_ref/refinement_lists.pyx
+++ b/src/sage/groups/perm_gps/partn_ref/refinement_lists.pyx
@@ -20,8 +20,8 @@ EXAMPLES::
 
 from cysignals.memory cimport sig_malloc, sig_free
 
-from .data_structures cimport *
-from .double_coset cimport double_coset, int_cmp
+from sage.groups.perm_gps.partn_ref.data_structures cimport *
+from sage.groups.perm_gps.partn_ref.double_coset cimport double_coset, int_cmp
 
 
 def is_isomorphic(self, other):
diff --git a/src/sage/groups/perm_gps/partn_ref/refinement_matrices.pxd b/src/sage/groups/perm_gps/partn_ref/refinement_matrices.pxd
index 7799111e457..2cf087e9915 100644
--- a/src/sage/groups/perm_gps/partn_ref/refinement_matrices.pxd
+++ b/src/sage/groups/perm_gps/partn_ref/refinement_matrices.pxd
@@ -8,9 +8,9 @@
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 
-from .data_structures cimport *
+from sage.groups.perm_gps.partn_ref.data_structures cimport *
 
-from .automorphism_group_canonical_label cimport (
+from sage.groups.perm_gps.partn_ref.automorphism_group_canonical_label cimport (
     get_aut_gp_and_can_lab, aut_gp_and_can_lab, agcl_work_space,
     allocate_agcl_output, deallocate_agcl_output,
     allocate_agcl_work_space, deallocate_agcl_work_space)
diff --git a/src/sage/groups/perm_gps/partn_ref/refinement_matrices.pyx b/src/sage/groups/perm_gps/partn_ref/refinement_matrices.pyx
index 4d55e2a09a2..c8d4f86a8f1 100644
--- a/src/sage/groups/perm_gps/partn_ref/refinement_matrices.pyx
+++ b/src/sage/groups/perm_gps/partn_ref/refinement_matrices.pyx
@@ -28,12 +28,12 @@ REFERENCE:
 
 from libc.string cimport memcmp
 
-from .data_structures cimport *
+from sage.groups.perm_gps.partn_ref.data_structures cimport *
 from sage.data_structures.bitset_base cimport *
 from sage.rings.integer cimport Integer
 from sage.matrix.constructor import Matrix
-from .refinement_binary cimport NonlinearBinaryCodeStruct, refine_by_bip_degree
-from .double_coset cimport double_coset
+from sage.groups.perm_gps.partn_ref.refinement_binary cimport NonlinearBinaryCodeStruct, refine_by_bip_degree
+from sage.groups.perm_gps.partn_ref.double_coset cimport double_coset
 
 
 cdef class MatrixStruct:
diff --git a/src/sage/groups/perm_gps/partn_ref/refinement_python.pxd b/src/sage/groups/perm_gps/partn_ref/refinement_python.pxd
index 1c13cb9c337..9f46107a1c1 100644
--- a/src/sage/groups/perm_gps/partn_ref/refinement_python.pxd
+++ b/src/sage/groups/perm_gps/partn_ref/refinement_python.pxd
@@ -8,7 +8,7 @@
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 
-from .data_structures cimport *
+from sage.groups.perm_gps.partn_ref.data_structures cimport *
 
 
 cdef class PythonPartitionStack:
diff --git a/src/sage/groups/perm_gps/partn_ref/refinement_python.pyx b/src/sage/groups/perm_gps/partn_ref/refinement_python.pyx
index 0a7de54bc4f..23d5e7576c7 100644
--- a/src/sage/groups/perm_gps/partn_ref/refinement_python.pyx
+++ b/src/sage/groups/perm_gps/partn_ref/refinement_python.pyx
@@ -32,11 +32,11 @@ debugger.
 
 from cysignals.memory cimport sig_malloc, sig_free
 
-from .data_structures cimport *
-from .automorphism_group_canonical_label cimport (
+from sage.groups.perm_gps.partn_ref.data_structures cimport *
+from sage.groups.perm_gps.partn_ref.automorphism_group_canonical_label cimport (
     get_aut_gp_and_can_lab, aut_gp_and_can_lab,
     deallocate_agcl_output)
-from .double_coset cimport double_coset
+from sage.groups.perm_gps.partn_ref.double_coset cimport double_coset
 from sage.rings.integer cimport Integer
 
 
diff --git a/src/sage/groups/perm_gps/partn_ref/refinement_sets.pxd b/src/sage/groups/perm_gps/partn_ref/refinement_sets.pxd
index 9a1d0da4bf2..94bcbe5bf95 100644
--- a/src/sage/groups/perm_gps/partn_ref/refinement_sets.pxd
+++ b/src/sage/groups/perm_gps/partn_ref/refinement_sets.pxd
@@ -17,12 +17,12 @@ AUTHORS:
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 
-from .data_structures cimport *
-from .automorphism_group_canonical_label cimport (
+from sage.groups.perm_gps.partn_ref.data_structures cimport *
+from sage.groups.perm_gps.partn_ref.automorphism_group_canonical_label cimport (
     get_aut_gp_and_can_lab, aut_gp_and_can_lab, agcl_work_space,
     allocate_agcl_output, deallocate_agcl_output,
     allocate_agcl_work_space, deallocate_agcl_work_space)
-from .canonical_augmentation cimport (iterator,
+from sage.groups.perm_gps.partn_ref.canonical_augmentation cimport (iterator,
     canonical_generator_data, allocate_cgd, deallocate_cgd,
     canonical_generator_next,
     setup_canonical_generator, start_canonical_generator)
diff --git a/src/sage/groups/perm_gps/partn_ref/refinement_sets.pyx b/src/sage/groups/perm_gps/partn_ref/refinement_sets.pyx
index cf8dd1b8c40..6ccc0b28c45 100644
--- a/src/sage/groups/perm_gps/partn_ref/refinement_sets.pyx
+++ b/src/sage/groups/perm_gps/partn_ref/refinement_sets.pyx
@@ -26,8 +26,8 @@ REFERENCE:
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 
-from .data_structures cimport *
-from .double_coset cimport double_coset
+from sage.groups.perm_gps.partn_ref.data_structures cimport *
+from sage.groups.perm_gps.partn_ref.double_coset cimport double_coset
 from sage.data_structures.bitset_base cimport *
 
 
diff --git a/src/sage/numerical/backends/cvxopt_backend.pyx b/src/sage/numerical/backends/cvxopt_backend.pyx
index fe4809d1232..0e2f3b82896 100644
--- a/src/sage/numerical/backends/cvxopt_backend.pyx
+++ b/src/sage/numerical/backends/cvxopt_backend.pyx
@@ -19,7 +19,7 @@ AUTHORS:
 #*****************************************************************************
 
 from sage.numerical.mip import MIPSolverException
-from .generic_backend cimport GenericBackend
+from sage.numerical.backends.generic_backend cimport GenericBackend
 from copy import copy
 
 
diff --git a/src/sage/numerical/backends/cvxopt_sdp_backend.pyx b/src/sage/numerical/backends/cvxopt_sdp_backend.pyx
index 115e3f504bb..7aa91de6158 100644
--- a/src/sage/numerical/backends/cvxopt_sdp_backend.pyx
+++ b/src/sage/numerical/backends/cvxopt_sdp_backend.pyx
@@ -22,7 +22,7 @@ AUTHORS:
 
 from sage.numerical.sdp import SDPSolverException
 from sage.matrix.constructor import Matrix
-from .matrix_sdp_backend cimport MatrixSDPBackend
+from sage.numerical.backends.matrix_sdp_backend cimport MatrixSDPBackend
 
 
 cdef class CVXOPTSDPBackend(MatrixSDPBackend):
diff --git a/src/sage/numerical/backends/glpk_backend.pxd b/src/sage/numerical/backends/glpk_backend.pxd
index 064c69cac18..4ff1d4a8d76 100644
--- a/src/sage/numerical/backends/glpk_backend.pxd
+++ b/src/sage/numerical/backends/glpk_backend.pxd
@@ -9,7 +9,7 @@
 #*****************************************************************************
 
 from sage.libs.glpk.types cimport glp_prob, glp_iocp, glp_smcp
-from .generic_backend cimport GenericBackend
+from sage.numerical.backends.generic_backend cimport GenericBackend
 
 
 # search_tree_data_t:
diff --git a/src/sage/numerical/backends/glpk_exact_backend.pxd b/src/sage/numerical/backends/glpk_exact_backend.pxd
index 40489d2ac94..89326bf3604 100644
--- a/src/sage/numerical/backends/glpk_exact_backend.pxd
+++ b/src/sage/numerical/backends/glpk_exact_backend.pxd
@@ -8,7 +8,7 @@
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 
-from .glpk_backend cimport GLPKBackend
+from sage.numerical.backends.glpk_backend cimport GLPKBackend
 
 cdef class GLPKExactBackend(GLPKBackend):
     cpdef int add_variable(self, lower_bound=*, upper_bound=*, binary=*, continuous=*, integer=*, obj=*, name=*) except -1
diff --git a/src/sage/numerical/backends/matrix_sdp_backend.pxd b/src/sage/numerical/backends/matrix_sdp_backend.pxd
index 4ebbf01a16d..9038955f83a 100644
--- a/src/sage/numerical/backends/matrix_sdp_backend.pxd
+++ b/src/sage/numerical/backends/matrix_sdp_backend.pxd
@@ -1,4 +1,5 @@
-from .generic_sdp_backend cimport GenericSDPBackend
+from sage.numerical.backends.generic_sdp_backend cimport GenericSDPBackend
+
 
 cdef class MatrixSDPBackend(GenericSDPBackend):
 
diff --git a/src/sage/numerical/backends/matrix_sdp_backend.pyx b/src/sage/numerical/backends/matrix_sdp_backend.pyx
index 7704ff91c90..631a7bd6dde 100644
--- a/src/sage/numerical/backends/matrix_sdp_backend.pyx
+++ b/src/sage/numerical/backends/matrix_sdp_backend.pyx
@@ -21,7 +21,7 @@ other classes implementing solvers.
 #*****************************************************************************
 
 from sage.matrix.constructor import Matrix
-from .generic_sdp_backend cimport GenericSDPBackend
+from sage.numerical.backends.generic_sdp_backend cimport GenericSDPBackend
 
 cdef class MatrixSDPBackend(GenericSDPBackend):
 
diff --git a/src/sage/numerical/backends/ppl_backend.pyx b/src/sage/numerical/backends/ppl_backend.pyx
index f3ba2f97236..0de85409c94 100644
--- a/src/sage/numerical/backends/ppl_backend.pyx
+++ b/src/sage/numerical/backends/ppl_backend.pyx
@@ -24,7 +24,7 @@ from sage.numerical.mip import MIPSolverException
 from ppl import MIP_Problem, Variable, Variables_Set, Linear_Expression
 from sage.rings.integer cimport Integer
 from sage.rings.rational cimport Rational
-from .generic_backend cimport GenericBackend
+from sage.numerical.backends.generic_backend cimport GenericBackend
 from copy import copy
 
 
diff --git a/src/sage/numerical/backends/scip_backend.pxd b/src/sage/numerical/backends/scip_backend.pxd
index c7a7c4d780c..93f1b81ab96 100644
--- a/src/sage/numerical/backends/scip_backend.pxd
+++ b/src/sage/numerical/backends/scip_backend.pxd
@@ -8,7 +8,7 @@
 #                  http://www.gnu.org/licenses/
 #*****************************************************************************
 
-from .generic_backend cimport GenericBackend
+from sage.numerical.backends.generic_backend cimport GenericBackend
 
 cdef class SCIPBackend(GenericBackend):
 
diff --git a/src/sage/plot/plot3d/base.pyx b/src/sage/plot/plot3d/base.pyx
index 85510d0c33a..253f152130c 100644
--- a/src/sage/plot/plot3d/base.pyx
+++ b/src/sage/plot/plot3d/base.pyx
@@ -63,8 +63,8 @@ from sage.misc.temporary_file import tmp_filename
 from sage.misc.fast_methods cimport hash_by_id
 from sage.modules.free_module_element import vector
 from sage.rings.real_double import RDF
-from .texture import Texture
-from .transform cimport Transformation, point_c, face_c
+from sage.plot.plot3d.texture import Texture
+from sage.plot.plot3d.transform cimport Transformation, point_c, face_c
 include "point_c.pxi"
 
 from sage.interfaces.tachyon import tachyon_rt
@@ -502,7 +502,7 @@ cdef class Graphics3d(SageObject):
             js_options['axesLabelsStyle'] = None
 
         if js_options['axesLabelsStyle'] is not None:
-            from .shapes import _validate_threejs_text_style
+            from sage.plot.plot3d.shapes import _validate_threejs_text_style
             style = js_options['axesLabelsStyle']
             if isinstance(style, dict):
                 style = _validate_threejs_text_style(style)
@@ -1552,7 +1552,7 @@ end_scene""".format(
         T = [xyz_min[i] - a_min[i] for i in range(3)]
         X = X.translate(T)
         if frame:
-            from .shapes2 import frame3d, frame_labels
+            from sage.plot.plot3d.shapes2 import frame3d, frame_labels
             F = frame3d(xyz_min, xyz_max, opacity=0.5, color=(0,0,0), thickness=thickness)
             if labels:
                 F += frame_labels(xyz_min, xyz_max, a_min_orig, a_max_orig)
@@ -1561,7 +1561,7 @@ end_scene""".format(
 
         if axes:
             # draw axes
-            from .shapes import arrow3d
+            from sage.plot.plot3d.shapes import arrow3d
             A = (arrow3d((min(0,a_min[0]),0, 0), (max(0,a_max[0]), 0,0),
                              thickness, color="blue"),
                  arrow3d((0,min(0,a_min[1]), 0), (0, max(0,a_max[1]), 0),
diff --git a/src/sage/plot/plot3d/index_face_set.pxd b/src/sage/plot/plot3d/index_face_set.pxd
index 3b42507ff62..5a81bd32de1 100644
--- a/src/sage/plot/plot3d/index_face_set.pxd
+++ b/src/sage/plot/plot3d/index_face_set.pxd
@@ -1,5 +1,6 @@
-from .base cimport PrimitiveObject
-from .transform cimport point_c, face_c, color_c
+from sage.plot.plot3d.base cimport PrimitiveObject
+from sage.plot.plot3d.transform cimport point_c, face_c, color_c
+
 
 cdef class IndexFaceSet(PrimitiveObject):
     cdef bint enclosed
@@ -13,15 +14,18 @@ cdef class IndexFaceSet(PrimitiveObject):
     # array used as storage for _faces[i].vertices
     cdef int* face_indices
 
+
 cdef class FaceIter:
     cdef Py_ssize_t i
     cdef IndexFaceSet set
 
+
 cdef class EdgeIter:
     cdef Py_ssize_t i, j
     cdef object seen
     cdef IndexFaceSet set
 
+
 cdef class VertexIter:
     cdef Py_ssize_t i
     cdef IndexFaceSet set
diff --git a/src/sage/plot/plot3d/index_face_set.pyx b/src/sage/plot/plot3d/index_face_set.pyx
index af5a9cfd32b..265bfc01513 100644
--- a/src/sage/plot/plot3d/index_face_set.pyx
+++ b/src/sage/plot/plot3d/index_face_set.pyx
@@ -62,7 +62,7 @@ from sage.plot.colors import Color, float_to_integer
 from sage.plot.plot3d.base import Graphics3dGroup
 from sage.plot.plot3d.texture import Texture
 
-from .transform cimport Transformation
+from sage.plot.plot3d.transform cimport Transformation
 
 
 # --------------------------------------------------------------------
@@ -1550,7 +1550,7 @@ cdef class IndexFaceSet(PrimitiveObject):
                str(self.fcount + extra_faces),
                faces]
 
-        from .base import flatten_list
+        from sage.plot.plot3d.base import flatten_list
         name = render_params.unique_name('obj')
         all = flatten_list(all)
         if render_params.output_archive:
diff --git a/src/sage/plot/plot3d/parametric_surface.pxd b/src/sage/plot/plot3d/parametric_surface.pxd
index 47265921622..82ac1164f8a 100644
--- a/src/sage/plot/plot3d/parametric_surface.pxd
+++ b/src/sage/plot/plot3d/parametric_surface.pxd
@@ -1,5 +1,6 @@
-from .index_face_set cimport IndexFaceSet
-from .transform cimport point_c
+from sage.plot.plot3d.index_face_set cimport IndexFaceSet
+from sage.plot.plot3d.transform cimport point_c
+
 
 cdef class ParametricSurface(IndexFaceSet):
     cdef object f
diff --git a/src/sage/plot/plot3d/parametric_surface.pyx b/src/sage/plot/plot3d/parametric_surface.pyx
index f62bc08b1a7..7399314961d 100644
--- a/src/sage/plot/plot3d/parametric_surface.pyx
+++ b/src/sage/plot/plot3d/parametric_surface.pyx
@@ -122,8 +122,8 @@ from math import cos, sin
 from sage.rings.real_double import RDF
 
 from sage.plot.colors import check_color_data
-from .base import RenderParams
-from .transform cimport point_c, face_c
+from sage.plot.plot3d.base import RenderParams
+from sage.plot.plot3d.transform cimport point_c, face_c
 from sage.ext.interpreters.wrapper_rdf cimport Wrapper_rdf
 
 include "point_c.pxi"
diff --git a/src/sage/plot/plot3d/shapes.pxd b/src/sage/plot/plot3d/shapes.pxd
index 37a85c19223..d01e2a7460d 100644
--- a/src/sage/plot/plot3d/shapes.pxd
+++ b/src/sage/plot/plot3d/shapes.pxd
@@ -1,4 +1,4 @@
-from .parametric_surface cimport ParametricSurface
+from sage.plot.plot3d.parametric_surface cimport ParametricSurface
 
 
 cdef class Cone(ParametricSurface):
@@ -6,13 +6,16 @@ cdef class Cone(ParametricSurface):
     cdef double height
     cdef bint closed
 
+
 cdef class Cylinder(ParametricSurface):
     cdef double radius
     cdef double height
     cdef bint closed
 
+
 cdef class Sphere(ParametricSurface):
     cdef double radius
 
+
 cdef class Torus(ParametricSurface):
     cdef double R, r
diff --git a/src/sage/plot/plot3d/shapes.pyx b/src/sage/plot/plot3d/shapes.pyx
index f5c98fe3929..e184075b23b 100644
--- a/src/sage/plot/plot3d/shapes.pyx
+++ b/src/sage/plot/plot3d/shapes.pyx
@@ -56,9 +56,9 @@ from libc.math cimport sqrt, sin, cos, acos, M_PI
 from sage.rings.real_double import RDF
 from sage.modules.free_module_element import vector
 from sage.misc.decorators import rename_keyword
-from .base import Graphics3dGroup
-from .index_face_set cimport IndexFaceSet, PrimitiveObject
-from .transform cimport point_c
+from sage.plot.plot3d.base import Graphics3dGroup
+from sage.plot.plot3d.index_face_set cimport IndexFaceSet, PrimitiveObject
+from sage.plot.plot3d.transform cimport point_c
 
 
 # Helper function to check that Box input is right
@@ -245,7 +245,7 @@ def ColorCube(size, colors, opacity=1, **kwds):
     all = []
     kwds['opacity'] = opacity
 
-    from .texture import Texture
+    from sage.plot.plot3d.texture import Texture
     for k in range(6):
         all.append(IndexFaceSet([faces[k]], enclosed=True,
              texture=Texture(colors[k], opacity=opacity),
@@ -1330,7 +1330,7 @@ def _validate_threejs_text_style(style):
     """
     default_color = '#000000' # black
     color = style.get('color', default_color)
-    from .texture import Texture
+    from sage.plot.plot3d.texture import Texture
     try:
         texture = Texture(color=color)
     except ValueError: