src/sage/manifolds/differentiable/degenerate.py: Conditionalize an im…

…port with 'if TYPE_CHECKING:'
sagemath · Mar 21, 2022 · 2061a50 · 2061a50
1 parent b2a68dc
commit 2061a50
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/src/sage/manifolds/differentiable/degenerate.py b/src/sage/manifolds/differentiable/degenerate.py
@@ -10,10 +10,15 @@
 #                  https://www.gnu.org/licenses/
 # *****************************************************************************
 
+from __future__ import annotations
+from typing import TYPE_CHECKING
+
 from sage.rings.infinity import infinity
 from sage.manifolds.structure import DegenerateStructure
 from sage.manifolds.differentiable.manifold import DifferentiableManifold
-from sage.manifolds.differentiable.metric import DegenerateMetric 
+
+if TYPE_CHECKING:
+    from sage.manifolds.differentiable.metric import DegenerateMetric
 
 ###############################################################################