From b9e420b56d0ee589ea4a6a6595279b468c4ae42f Mon Sep 17 00:00:00 2001
From: Ariel Pillemer <63328798+pillemer@users.noreply.github.com>
Date: Mon, 7 Dec 2020 10:06:42 +1100
Subject: [PATCH 1/2] rewrite dict as literal in
 tests/io/parser/test_index_col.py

for issue # 38138
rewrite unnecessary dict call as a literal in pandas/tests/io/parser/test_index_col.py

Please let me know if anything needs to be amended, changed or fixed. I'm new to contributing.
---
 pandas/tests/io/parser/test_index_col.py | 40 +++++++++++++-----------
 1 file changed, 22 insertions(+), 18 deletions(-)

diff --git a/pandas/tests/io/parser/test_index_col.py b/pandas/tests/io/parser/test_index_col.py
index 9c6cad4b41949..12c50d34f7b98 100644
--- a/pandas/tests/io/parser/test_index_col.py
+++ b/pandas/tests/io/parser/test_index_col.py
@@ -86,35 +86,39 @@ def test_infer_index_col(all_parsers):
 @pytest.mark.parametrize(
     "index_col,kwargs",
     [
-        (None, dict(columns=["x", "y", "z"])),
-        (False, dict(columns=["x", "y", "z"])),
-        (0, dict(columns=["y", "z"], index=Index([], name="x"))),
-        (1, dict(columns=["x", "z"], index=Index([], name="y"))),
-        ("x", dict(columns=["y", "z"], index=Index([], name="x"))),
-        ("y", dict(columns=["x", "z"], index=Index([], name="y"))),
+        (None, {"columns": ["x", "y", "z"]}),
+        (False, {"columns": ["x", "y", "z"]}),
+        (0, {"columns": ["y", "z"], "index": Index([], name="x")}),
+        (1, {"columns": ["x", "z"], "index": Index([], name="y")}),
+        ("x", {"columns": ["y", "z"], "index": Index([], name="x")}),
+        ("y", {"columns": ["x", "z"], "index": Index([], name="y")}),
         (
             [0, 1],
-            dict(
-                columns=["z"], index=MultiIndex.from_arrays([[]] * 2, names=["x", "y"])
-            ),
+            {
+                "columns": ["z"], 
+                "index": MultiIndex.from_arrays([[]] * 2, names=["x", "y"])
+            },
         ),
         (
             ["x", "y"],
-            dict(
-                columns=["z"], index=MultiIndex.from_arrays([[]] * 2, names=["x", "y"])
-            ),
+            {
+                "columns": ["z"], 
+                "index": MultiIndex.from_arrays([[]] * 2, names=["x", "y"])
+            },
         ),
         (
             [1, 0],
-            dict(
-                columns=["z"], index=MultiIndex.from_arrays([[]] * 2, names=["y", "x"])
-            ),
+            {
+                "columns": ["z"], 
+                "index": MultiIndex.from_arrays([[]] * 2, names=["y", "x"])
+            },
         ),
         (
             ["y", "x"],
-            dict(
-                columns=["z"], index=MultiIndex.from_arrays([[]] * 2, names=["y", "x"])
-            ),
+            {
+                "columns": ["z"], 
+                "index": MultiIndex.from_arrays([[]] * 2, names=["y", "x"])
+            },
         ),
     ],
 )

From 92a9b247f49c55009f4bd8ac7bc3400f5420a992 Mon Sep 17 00:00:00 2001
From: Ariel Pillemer <63328798+pillemer@users.noreply.github.com>
Date: Mon, 7 Dec 2020 15:33:18 +1100
Subject: [PATCH 2/2] Update test_index_col.py

fixed linting error
---
 pandas/tests/io/parser/test_index_col.py | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/pandas/tests/io/parser/test_index_col.py b/pandas/tests/io/parser/test_index_col.py
index 12c50d34f7b98..d55814a0e9a2d 100644
--- a/pandas/tests/io/parser/test_index_col.py
+++ b/pandas/tests/io/parser/test_index_col.py
@@ -95,28 +95,28 @@ def test_infer_index_col(all_parsers):
         (
             [0, 1],
             {
-                "columns": ["z"], 
+                "columns": ["z"],
                 "index": MultiIndex.from_arrays([[]] * 2, names=["x", "y"])
             },
         ),
         (
             ["x", "y"],
             {
-                "columns": ["z"], 
+                "columns": ["z"],
                 "index": MultiIndex.from_arrays([[]] * 2, names=["x", "y"])
             },
         ),
         (
             [1, 0],
             {
-                "columns": ["z"], 
+                "columns": ["z"],
                 "index": MultiIndex.from_arrays([[]] * 2, names=["y", "x"])
             },
         ),
         (
             ["y", "x"],
             {
-                "columns": ["z"], 
+                "columns": ["z"],
                 "index": MultiIndex.from_arrays([[]] * 2, names=["y", "x"])
             },
         ),