use _an_element_ in combinat

Author: fchapoton

src/sage/combinat/chas/wqsym.py

@@ -239,7 +239,7 @@ def coerce_base_ring(self, x):
         return super()._coerce_map_from_(R)
 
     @cached_method
-    def an_element(self):
+    def _an_element_(self):
         """
         Return an element of ``self``.
 

src/sage/combinat/composition_tableau.py

@@ -732,7 +732,7 @@ def _repr_(self):
         """
         return "Composition tableaux of shape %s and maximum entry %s" % (str(self.shape), str(self.max_entry))
 
-    def an_element(self):
+    def _an_element_(self):
         r"""
         Return a particular element of :class:`CompositionTableaux_shape`.
 

src/sage/combinat/debruijn_sequence.pyx

@@ -300,7 +300,7 @@ class DeBruijnSequences(UniqueRepresentation, Parent):
         return ("De Bruijn sequences with arity %s and substring length %s"
                 % (self.k, self.n))
 
-    def an_element(self):
+    def _an_element_(self):
         """
         Return the lexicographically smallest De Bruijn sequence with the given
         parameters.

src/sage/combinat/fqsym.py

@@ -166,7 +166,7 @@ def G_to_G_on_basis(t):
         return super()._coerce_map_from_(R)
 
     @cached_method
-    def an_element(self):
+    def _an_element_(self):
         """
         Return an element of ``self``.
 

src/sage/combinat/free_dendriform_algebra.py

@@ -316,7 +316,7 @@ def degree_on_basis(self, t):
         return t.node_number()
 
     @cached_method
-    def an_element(self):
+    def _an_element_(self):
         """
         Return an element of ``self``.
 

src/sage/combinat/free_prelie_algebra.py

@@ -376,7 +376,7 @@ def degree_on_basis(self, t):
         return t.node_number()
 
     @cached_method
-    def an_element(self):
+    def _an_element_(self):
         """
         Return an element of ``self``.
 

src/sage/combinat/grossman_larson_algebras.py

@@ -363,7 +363,7 @@ def degree_on_basis(self, t):
         return t.node_number() - 1
 
     @cached_method
-    def an_element(self):
+    def _an_element_(self):
         """
         Return an element of ``self``.
 

src/sage/combinat/hillman_grassl.py

@@ -460,7 +460,7 @@ def _repr_(self):
 
     Element = WeakReversePlanePartition
 
-    def an_element(self):
+    def _an_element_(self):
         r"""
         Return a particular element of the class.
 

src/sage/combinat/integer_vectors_mod_permgroup.py

@@ -1122,11 +1122,11 @@ def retract(self, elt):
         intarray = self.element_class(self, elt, check=False)
         return self.element_class(self, canonical_representative_of_orbit_of(self._sgs, intarray), check=False)
 
-    def an_element(self):
+    def _an_element_(self):
         r"""
         Return an element of ``self``.
 
-        Raises an :exc:`EmptySetError` when ``self`` is empty.
+        This raises an :exc:`EmptySetError` when ``self`` is empty.
 
         EXAMPLES::
 

src/sage/combinat/k_tableau.py

@@ -3928,7 +3928,7 @@ def _repr_( self ):
 
     options = Tableaux.options
 
-    def an_element(self):
+    def _an_element_(self):
         r"""
         Return the first generated element of the class of ``StrongTableaux``.