Update tensors.py

mathics/builtin/tensors.py

@@ -22,11 +22,15 @@
 from mathics.core.atoms import Integer, String
 from mathics.core.attributes import A_FLAT, A_ONE_IDENTITY, A_PROTECTED
 from mathics.core.builtin import BinaryOperator, Builtin
+from mathics.core.convert.python import from_python
 from mathics.core.evaluation import Evaluation
 from mathics.core.expression import Expression
 from mathics.core.list import ListExpression
 from mathics.core.symbols import Atom, Symbol, SymbolFalse, SymbolTrue
+from mathics.core.systemsymbols import SymbolRule, SymbolSparseArray
 from mathics.eval.parts import get_part
+from sympy.combinatorics import Permutation
+from sympy.utilities.iterables import permutations
 
 
 def get_default_distance(p):
@@ -519,11 +523,6 @@ class LeviCivitaTensor(Builtin):
     def eval(self, d, type, evaluation: Evaluation):
         "LeviCivitaTensor[d_Integer, type_]"
 
-        from mathics.core.systemsymbols import SymbolSparseArray, SymbolRule
-        from mathics.core.convert.python import from_python
-        from sympy.utilities.iterables import permutations
-        from sympy.combinatorics import Permutation
-
         if isinstance(d, Integer) and type == SymbolSparseArray:
             d = d.get_int_value()
             perms = list(permutations([i for i in range(1, d + 1)]))