From 204896e479b04d2e8bc283b40f91f5a74a2fd19c Mon Sep 17 00:00:00 2001
From: Matthew Zeitlin <mzeitlin@caltech.edu>
Date: Thu, 22 Apr 2021 17:27:26 -0400
Subject: [PATCH 1/2] BUG: read_csv/table raising when sys.setprofile used

---
 doc/source/whatsnew/v1.3.0.rst                    |  1 +
 pandas/io/parsers/readers.py                      |  6 ++++--
 .../tests/io/parser/common/test_common_basic.py   | 15 +++++++++++++++
 3 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/doc/source/whatsnew/v1.3.0.rst b/doc/source/whatsnew/v1.3.0.rst
index 0e567972e7823..f1f0f222f37ad 100644
--- a/doc/source/whatsnew/v1.3.0.rst
+++ b/doc/source/whatsnew/v1.3.0.rst
@@ -796,6 +796,7 @@ I/O
 - Bug in :func:`read_excel` dropping empty values from single-column spreadsheets (:issue:`39808`)
 - Bug in :meth:`DataFrame.to_string` misplacing the truncation column when ``index=False`` (:issue:`40907`)
 - Bug in :func:`read_orc` always raising ``AttributeError`` (:issue:`40918`)
+- Bug in :func:`read_csv` and :func:`read_table` misinterpreting arguments when ``sys.setprofile`` had been previously called (:issue:`41069`)
 
 Period
 ^^^^^^
diff --git a/pandas/io/parsers/readers.py b/pandas/io/parsers/readers.py
index 796d44dc7877a..55e3e14a0969d 100644
--- a/pandas/io/parsers/readers.py
+++ b/pandas/io/parsers/readers.py
@@ -540,7 +540,8 @@ def read_csv(
     float_precision=None,
     storage_options: StorageOptions = None,
 ):
-    kwds = locals()
+    # locals() should never be modified
+    kwds = locals().copy()
     del kwds["filepath_or_buffer"]
     del kwds["sep"]
 
@@ -620,7 +621,8 @@ def read_table(
     memory_map=False,
     float_precision=None,
 ):
-    kwds = locals()
+    # locals() should never be modified
+    kwds = locals().copy()
     del kwds["filepath_or_buffer"]
     del kwds["sep"]
 
diff --git a/pandas/tests/io/parser/common/test_common_basic.py b/pandas/tests/io/parser/common/test_common_basic.py
index 572bc09c96886..0ed48b5edf2b1 100644
--- a/pandas/tests/io/parser/common/test_common_basic.py
+++ b/pandas/tests/io/parser/common/test_common_basic.py
@@ -6,6 +6,7 @@
 from inspect import signature
 from io import StringIO
 import os
+import sys
 from pathlib import Path
 
 import numpy as np
@@ -631,6 +632,20 @@ def test_read_table_equivalency_to_read_csv(all_parsers):
     tm.assert_frame_equal(result, expected)
 
 
+@pytest.mark.parametrize("read_func", ["read_csv", "read_table"])
+def test_read_csv_and_table_sys_setprofile(all_parsers, read_func):
+    # GH#41069
+    parser = all_parsers
+    data = "a b\n0 1"
+
+    sys.setprofile(lambda *a, **k: None)
+    result = getattr(parser, read_func)(StringIO(data))
+    sys.setprofile(None)
+
+    expected = DataFrame({"a b": ["0 1"]})
+    tm.assert_frame_equal(result, expected)
+
+
 def test_first_row_bom(all_parsers):
     # see gh-26545
     parser = all_parsers

From 8c2bef3bf22839195144b532b53190bbfaffceb6 Mon Sep 17 00:00:00 2001
From: Matthew Zeitlin <mzeitlin@caltech.edu>
Date: Thu, 22 Apr 2021 17:30:25 -0400
Subject: [PATCH 2/2] isort fixup

---
 pandas/tests/io/parser/common/test_common_basic.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/pandas/tests/io/parser/common/test_common_basic.py b/pandas/tests/io/parser/common/test_common_basic.py
index 0ed48b5edf2b1..fe68597d11f0b 100644
--- a/pandas/tests/io/parser/common/test_common_basic.py
+++ b/pandas/tests/io/parser/common/test_common_basic.py
@@ -6,8 +6,8 @@
 from inspect import signature
 from io import StringIO
 import os
-import sys
 from pathlib import Path
+import sys
 
 import numpy as np
 import pytest