deprecate df[[col(foo)]] syntax (#3286)

pola-rs · May 2, 2022 · 29e1737 · 29e1737
1 parent 1db6267
commit 29e1737
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/py-polars/polars/internals/frame.py b/py-polars/polars/internals/frame.py
@@ -1599,6 +1599,10 @@ def __getitem__(
         Does quite a lot. Read the comments.
         """
         if isinstance(item, pli.Expr):
+            warnings.warn(
+                "'using expressions in []' is deprecated. please use 'select'",
+                DeprecationWarning,
+            )
             return self.select(item)
         # select rows and columns at once
         # every 2d selection, i.e. tuple is row column order, just like numpy