Lazy import of FiniteRankFreeModule + import of Chart at the module l…

…evel in free_module_tensor.py

src/sage/tensor/modules/all.py

@@ -1,2 +1,3 @@
-from __future__ import absolute_import
-from .finite_rank_free_module import FiniteRankFreeModule
+from sage.misc.lazy_import import lazy_import
+lazy_import('sage.tensor.modules.finite_rank_free_module',
+            'FiniteRankFreeModule')

src/sage/tensor/modules/free_module_tensor.py

@@ -199,6 +199,7 @@ class being:
 from sage.tensor.modules.tensor_with_indices import TensorWithIndices
 from sage.parallel.decorate import parallel
 from sage.parallel.parallelism import Parallelism
+from sage.manifolds.chart import Chart
 
 
 class FreeModuleTensor(ModuleElement):
@@ -573,7 +574,6 @@ def _preparse_display(self, basis=None, format_spec=None):
             (Basis (e_0,e_1) on the Rank-2 free module M over the Integer Ring, 10)
 
         """
-        from sage.manifolds.chart import Chart
         if basis is None:
             basis = self._fmodule._def_basis
         elif isinstance(basis, Chart):