feat(python): raise more informative error message if someone lands o…

…n Expr.__bool__ (#14067)

py-polars/polars/expr/expr.py

@@ -142,8 +142,13 @@ def __str__(self) -> str:
     def __bool__(self) -> NoReturn:
         msg = (
             "the truth value of an Expr is ambiguous"
-            "\n\nHint: use '&' or '|' to logically combine Expr, not 'and'/'or', and"
-            " use `x.is_in([y,z])` instead of `x in [y,z]` to check membership."
+            "\n\n"
+            "You probably got here by using a Python standard library function instead "
+            "of the native expressions API.\n"
+            "Here are some things you might want to try:\n"
+            "- instead of `pl.col('a') and pl.col('b')`, use `pl.col('a') & pl.col('b')`\n"
+            "- instead of `pl.col('a') in [y, z]`, use `pl.col('a').is_in([y, z])`\n"
+            "- instead of `max(pl.col('a'), pl.col('b'))`, use `pl.max_horizontal(pl.col('a'), pl.col('b'))`\n"
         )
         raise TypeError(msg)