maropu commented on a change in pull request #26886: 
[SPARK-30231][SQL][PYTHON][FOLLOWUP] Make error messages clear in PySpark 
df.explain
URL: https://github.com/apache/spark/pull/26886#discussion_r357878859
 
 

 ##########
 File path: python/pyspark/sql/dataframe.py
 ##########
 @@ -305,11 +305,11 @@ def explain(self, extended=None, mode=None):
         is_mode_case = mode is not None and isinstance(mode, basestring)
 
         if not is_no_argument and not (is_extended_case or is_mode_case):
-            argtypes = [
-                str(type(arg)) for arg in [extended, mode] if arg is not None]
-            raise TypeError(
-                "extended (optional) and mode (optional) should be a bool and 
str; "
-                "however, got [%s]." % ", ".join(argtypes))
+            if extended is not None:
+                errMsg = "extended should be provided as bool, got 
{0}".format(type(extended))
+            else:  # For mode case
+                errMsg = "mode should be provided as str, got 
{0}".format(type(mode))
+            raise TypeError(errMsg)
 
 Review comment:
   How about this error handling? @viirya 
https://github.com/apache/spark/pull/26861#discussion_r357726827

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