Cython View API: added small tools

python/obitools3/dms/view/view.pyx

@@ -389,6 +389,12 @@ cdef class View(OBIWrapper) :
             raise OBIDeactivatedInstanceError()
         return self.pointer().infos.line_count
 
+    # line_count property getter
+    @property
+    def read_only(self):
+        if not self.active() :
+            raise OBIDeactivatedInstanceError()
+        return self.pointer().read_only
 
     # name property getter
     @property
@@ -435,6 +441,8 @@ cdef class Line :
         cdef bytes      column_name_b
         
         column_name_b = tobytes(column_name)
+                
+        # TODO use functions in utils
         
         if column_name_b not in self._view :
             if value == None :
@@ -458,7 +466,8 @@ cdef class Line :
                 elif (len(value) > 1) :
                     value_obitype = OBI_STR
             else :
-                raise RollbackException("Could not guess the type of a value to create a new column", self)
+                raise CantGuessTypeException()
+                #raise RollbackException("Could not guess the type of a value to create a new column", self._view)
             
             Column.new_column(self._view, column_name_b, value_obitype)
  
@@ -636,6 +645,9 @@ class RollbackException(Exception):
             OBIWrapper.close(view)
 
 
+class CantGuessTypeException(Exception):
+    pass
+
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