remove empty line + add typing annotation

Author: fchapoton

src/sage/rings/multi_power_series_ring.py

@@ -1020,7 +1020,7 @@ def ngens(self):
         """
         return self._ngens
 
-    def gens(self):
+    def gens(self) -> tuple:
         """
         Return the generators of this ring.
 
@@ -1030,7 +1030,6 @@ def gens(self):
             sage: M.gens()
             (v0, v1, v2)
         """
-
         return tuple(self.gen(i) for i in range(self._ngens))
 
     def prec_ideal(self):

src/sage/rings/power_series_ring.py

@@ -1100,7 +1100,7 @@ def gen(self, n=0):
             raise IndexError("generator n>0 not defined")
         return self.__generator
 
-    def gens(self):
+    def gens(self) -> tuple:
         """
         Return the generators of this ring.