Cython API: fixed a bug where iteration on a NUC_SEQS view would not be

done correctly (bug appeared with optimization modifications done
lately)

python/obitools3/dms/view/typed_view/view_NUC_SEQS.pyx

@@ -58,12 +58,25 @@ cdef class View_NUC_SEQS(View):
         return view
 
 
-# TODO
+    # TODO test time gain without
+    @OBIWrapper.checkIsActive
     def __getitem__(self, object item) :
         if type(item) == int :
             return Nuc_Seq_Stored(self, item)
         else :  # TODO assume str or bytes for optimization?
             return self.get_column(item)    # TODO hyper lent dans la pratique
+
+
+    @OBIWrapper.checkIsActive
+    def __iter__(self):
+        # Iteration on each line of all columns
+        
+        # Declarations
+        cdef index_t line_nb
+        
+        # Yield each line    
+        for line_nb in range(self.line_count) :
+            yield Nuc_Seq_Stored(self, line_nb)
     
 
 # TODO? test if efficiency gain