From fa82d3bc8142779e8cd36a0266c4f609bfff7af5 Mon Sep 17 00:00:00 2001
From: Alexander Beedie <alexander-beedie@users.noreply.github.com>
Date: Wed, 2 Aug 2023 18:26:58 +0400
Subject: [PATCH] fix conflation of str/collection

---
 py-polars/polars/lazyframe/frame.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/py-polars/polars/lazyframe/frame.py b/py-polars/polars/lazyframe/frame.py
index 741deaaafab10..df6422d12c6fb 100644
--- a/py-polars/polars/lazyframe/frame.py
+++ b/py-polars/polars/lazyframe/frame.py
@@ -3371,7 +3371,11 @@ def drop(
 
         """
         input_cols: list[str | SelectorType] = [
-            *(columns if isinstance(columns, Collection) else [columns]),  # type: ignore[list-item]
+            *(
+                columns
+                if isinstance(columns, Collection) and not isinstance(columns, str)
+                else [columns]  # type: ignore[list-item]
+            ),
             *more_columns,
         ]
         drop_cols: list[str] = []