Fix stein_watkins tests

Author: antonio-rojas

src/sage/databases/stein_watkins.py

@@ -1,3 +1,4 @@
+# sage.doctest: needs database_stein_watkins
 r"""
 The Stein-Watkins table of elliptic curves
 
@@ -41,7 +42,6 @@
 We type ``next(d)`` to get each isogeny class of
 curves from ``d``::
 
-    sage: # optional - database_stein_watkins
     sage: C = next(d)
     sage: C
     Stein-Watkins isogeny class of conductor 11
@@ -56,7 +56,6 @@
 
 ::
 
-    sage: # optional - database_stein_watkins
     sage: C.data
     ['11', '[11]', '0', '0.253842', '25', '+*1']
     sage: C.curves
@@ -83,24 +82,23 @@
 following::
 
     sage: d = SteinWatkinsAllData(1)
-    sage: C = next(d)                                  # optional - database_stein_watkins
-    sage: C                                            # optional - database_stein_watkins
+    sage: C = next(d)
+    sage: C
     Stein-Watkins isogeny class of conductor 100002
-    sage: C.curves                                     # optional - database_stein_watkins
+    sage: C.curves
     [[[1, 1, 0, 112, 0], '(8,1,2,1)', 'X', '2'],
      [[1, 1, 0, -448, -560], '[4,2,1,2]', 'X', '2']]
 
 Next we access the prime-conductor data::
 
     sage: d = SteinWatkinsPrimeData(0)
-    sage: C = next(d)                                  # optional - database_stein_watkins
-    sage: C                                            # optional - database_stein_watkins
+    sage: C = next(d)
+    sage: C
     Stein-Watkins isogeny class of conductor 11
 
 Each call ``next(d)`` gives another elliptic curve of
 prime conductor::
 
-    sage: # optional - database_stein_watkins
     sage: C = next(d)
     sage: C
     Stein-Watkins isogeny class of conductor 17
@@ -207,8 +205,8 @@ def __iter__(self):
         EXAMPLES::
 
             sage: d = SteinWatkinsAllData(0)
-            sage: d = d[10:20]                         # optional - database_stein_watkins; long time
-            sage: for C in d:                          # optional - database_stein_watkins; long time
+            sage: d = d[10:20]
+            sage: for C in d:
             ....:     print(C)
             Stein-Watkins isogeny class of conductor 11
             Stein-Watkins isogeny class of conductor 14
@@ -256,7 +254,7 @@ def __getitem__(self, N):
         EXAMPLES::
 
             sage: d = SteinWatkinsAllData(0)
-            sage: d[15:18]                             # optional - database_stein_watkins; long time
+            sage: d[15:18]
             [Stein-Watkins isogeny class of conductor 15, Stein-Watkins isogeny
              class of conductor 17]
         """
@@ -287,12 +285,12 @@ def iter_levels(self):
 
             sage: d = SteinWatkinsAllData(1)
             sage: E = d.iter_levels()
-            sage: next(E)                             # optional - database_stein_watkins
+            sage: next(E)
             [Stein-Watkins isogeny class of conductor 100002]
-            sage: next(E)                             # optional - database_stein_watkins
+            sage: next(E)
             [Stein-Watkins isogeny class of conductor 100005,
             Stein-Watkins isogeny class of conductor 100005]
-            sage: next(E)                             # optional - database_stein_watkins
+            sage: next(E)
             [Stein-Watkins isogeny class of conductor 100007]
         """
         it = iter(self)
@@ -350,7 +348,7 @@ def ecdb_num_curves(max_level=200000):
 
     EXAMPLES::
 
-        sage: sage.databases.stein_watkins.ecdb_num_curves(100) # optional - database_stein_watkins
+        sage: sage.databases.stein_watkins.ecdb_num_curves(100)
         [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 6, 8, 0, 4, 0, 3, 4, 6, 0, 0,
          6, 0, 5, 4, 0, 0, 8, 0, 4, 4, 4, 3, 4, 4, 5, 4, 4, 0, 6, 1, 2, 8, 2, 0,
          6, 4, 8, 2, 2, 1, 6, 4, 6, 7, 3, 0, 0, 1, 4, 6, 4, 2, 12, 1, 0, 2, 4, 0,