add mdx dimension hierarchize

mdxpy/mdx.py

@@ -462,7 +462,7 @@ def ancestor(member: Union[str, Member], ancestor: int) -> 'MdxHierarchySet':
         return AncestorHierarchySet(member, ancestor)
 
     @staticmethod
-    def drill_down_level(member: Union[str, Member], level) -> 'MdxHierarchySet':
+    def drill_down_level(member: Union[str, Member], level: int) -> 'MdxHierarchySet':
         if isinstance(member, str):
             member = Member.of(member)
         return DrillDownLevelHierarchySet(member, level)
@@ -705,6 +705,11 @@ def __init__(self, member: Member, level):
         self.level = level
         self.member = member
 
+        if level:
+            self.level = level
+        else:
+            self.level = 1
+
     def to_mdx(self) -> str:
         startstring = ''
         endstring = ''

test.py

@@ -279,6 +279,13 @@ def test_mdx_hierarchy_set_drill_down_level(self):
             "{DRILLDOWNLEVEL({[dimension].[dimension].[element]})}",
             hierarchy_set.to_mdx())
 
+        hierarchy_set = MdxHierarchySet.drill_down_level(Member.of("Dimension", "Element"), level=3)
+
+        self.assertEqual(
+            "{DRILLDOWNLEVEL(DRILLDOWNLEVEL(DRILLDOWNLEVEL({[dimension].[dimension].[element]})))}",
+            hierarchy_set.to_mdx())
+
+
     def test_mdx_hierarchy_set_tm1_drill_down_member_all_recursive(self):
         hierarchy_set = MdxHierarchySet.members([Member.of("dimension", "element")]).tm1_drill_down_member(
             recursive=True)