diff --git a/pydatastructs/trees/binary_trees.py b/pydatastructs/trees/binary_trees.py
index a313a957..d914b8ab 100644
--- a/pydatastructs/trees/binary_trees.py
+++ b/pydatastructs/trees/binary_trees.py
@@ -1055,7 +1055,7 @@ def __new__(cls, key=None, root_data=None, comp=None,
 
     @classmethod
     def methods(cls):
-        return ['__new__','insert', 'delete', 'join', 'split']
+        return ['__new__', 'insert', 'delete', 'join', 'split']
 
     def _zig(self, x, p):
         if self.tree[p].left == x: