src/sage/rings/real_double.pyx: Use sage.rings.abc

sagemath · Oct 23, 2021 · 7e8f0bb · 7e8f0bb
1 parent 6dce213
commit 7e8f0bb
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/sage/rings/real_double.pyx b/src/sage/rings/real_double.pyx
@@ -360,8 +360,7 @@ cdef class RealDoubleField_class(sage.rings.abc.RealDoubleField):
         if S is ZZ or S is QQ or S is RLF:
             return ToRDF(S)
 
-        from .real_mpfr import RR, RealField_class
-        if isinstance(S, RealField_class):
+        if isinstance(S, sage.rings.abc.RealField):
             if S.prec() >= 53:
                 return ToRDF(S)
             else:
@@ -373,6 +372,7 @@ cdef class RealDoubleField_class(sage.rings.abc.RealDoubleField):
             else:
                 return None
 
+        from .real_mpfr import RR
         connecting = RR._internal_coerce_map_from(S)
         if connecting is not None:
             return ToRDF(RR) * connecting