From a27bc1fc929f562faee128698c3d33a369e39b82 Mon Sep 17 00:00:00 2001
From: Luke Manley <lukemanley@gmail.com>
Date: Wed, 31 May 2023 21:45:08 -0400
Subject: [PATCH] TYP: algos.isin

---
 pandas/core/algorithms.py        | 7 ++++---
 pandas/core/tools/datetimes.py   | 4 +---
 pandas/io/parsers/base_parser.py | 6 +-----
 3 files changed, 6 insertions(+), 11 deletions(-)

diff --git a/pandas/core/algorithms.py b/pandas/core/algorithms.py
index 33bd56e5b1068..9c2859c909b1b 100644
--- a/pandas/core/algorithms.py
+++ b/pandas/core/algorithms.py
@@ -83,6 +83,7 @@
 
 if TYPE_CHECKING:
     from pandas._typing import (
+        ListLike,
         NumpySorter,
         NumpyValueArrayLike,
     )
@@ -438,14 +439,14 @@ def unique_with_mask(values, mask: npt.NDArray[np.bool_] | None = None):
 unique1d = unique
 
 
-def isin(comps: AnyArrayLike, values: AnyArrayLike) -> npt.NDArray[np.bool_]:
+def isin(comps: ListLike, values: ListLike) -> npt.NDArray[np.bool_]:
     """
     Compute the isin boolean array.
 
     Parameters
     ----------
-    comps : array-like
-    values : array-like
+    comps : list-like
+    values : list-like
 
     Returns
     -------
diff --git a/pandas/core/tools/datetimes.py b/pandas/core/tools/datetimes.py
index 74210a1ce5ad8..cba47c1f759b1 100644
--- a/pandas/core/tools/datetimes.py
+++ b/pandas/core/tools/datetimes.py
@@ -1252,9 +1252,7 @@ def calc_with_mask(carg, mask):
 
     # string with NaN-like
     try:
-        # error: Argument 2 to "isin" has incompatible type "List[Any]"; expected
-        # "Union[Union[ExtensionArray, ndarray], Index, Series]"
-        mask = ~algorithms.isin(arg, list(nat_strings))  # type: ignore[arg-type]
+        mask = ~algorithms.isin(arg, list(nat_strings))
         return calc_with_mask(arg, mask)
     except (ValueError, OverflowError, TypeError):
         pass
diff --git a/pandas/io/parsers/base_parser.py b/pandas/io/parsers/base_parser.py
index f79b7ebe7efef..6cded2e21a43c 100644
--- a/pandas/io/parsers/base_parser.py
+++ b/pandas/io/parsers/base_parser.py
@@ -558,11 +558,7 @@ def _convert_to_ndarrays(
                 try:
                     values = lib.map_infer(values, conv_f)
                 except ValueError:
-                    # error: Argument 2 to "isin" has incompatible type "List[Any]";
-                    # expected "Union[Union[ExtensionArray, ndarray], Index, Series]"
-                    mask = algorithms.isin(
-                        values, list(na_values)  # type: ignore[arg-type]
-                    ).view(np.uint8)
+                    mask = algorithms.isin(values, list(na_values)).view(np.uint8)
                     values = lib.map_infer_mask(values, conv_f, mask)
 
                 cvals, na_count = self._infer_types(