fixed parameter checking

src/Dataset.py

@@ -232,7 +232,7 @@ class Dataset:
         if type(colname) != str:
             logging.error("parameter `colname` is not a string")
             raise ValueError(f"{colname} is not a string")
-        if type(colname) not in (None, bool):
+        if type(ascending) not in (None, bool):
             logging.error("parameter `ascending` is not a bool or None")
             raise ValueError(f"{colname} is not a bool or None")
 
@@ -270,7 +270,7 @@ class Dataset:
         if type(colname) != str:
             logging.error("parameter `colname` is not a string")
             raise ValueError(f"{colname} is not a string")
-        if type(colname) not in (None, bool):
+        if type(ascending) not in (None, bool):
             logging.error("parameter `ascending` is not a bool or None")
             raise ValueError(f"{colname} is not a bool or None")