From 761ac0e839f34606e5e4f0b08f450cbb3a48504b Mon Sep 17 00:00:00 2001
From: Aniket Singh Yadav <singhyadavaniket43@gmail.com>
Date: Mon, 25 Aug 2025 04:26:39 +0530
Subject: [PATCH 1/4] DOC: Clarify list-like vs scalar in Series.eq docstring

---
 pandas/core/series.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/pandas/core/series.py b/pandas/core/series.py
index b40e71f2b5b42..52a045c2d0f37 100644
--- a/pandas/core/series.py
+++ b/pandas/core/series.py
@@ -6072,7 +6072,9 @@ def eq(
         Parameters
         ----------
         other : Series or scalar value
-            The second operand in this operation.
+            The second operand in this operation. Only `np.ndarray`, `list`, `tuple`,
+            and `Series` are considered "list-like" by pandas. All other types will
+            be treated as scalar values.
         level : int or name
             Broadcast across a level, matching Index values on the
             passed MultiIndex level.

From 9296b6e59f390b8cd48d6e68e567133c3773168e Mon Sep 17 00:00:00 2001
From: Aniket Singh Yadav <singhyadavaniket43@gmail.com>
Date: Sat, 6 Sep 2025 11:32:18 +0530
Subject: [PATCH 2/4] ERR: Improve error message for deprecated frequency
 aliases

---
 .../tseries/frequencies/test_frequencies.py   |  8 +++++++
 pandas/tseries/frequencies.py                 | 23 ++++++++++++++++++-
 2 files changed, 30 insertions(+), 1 deletion(-)

diff --git a/pandas/tests/tseries/frequencies/test_frequencies.py b/pandas/tests/tseries/frequencies/test_frequencies.py
index f0af290b2fb69..ebf3f5c697c9d 100644
--- a/pandas/tests/tseries/frequencies/test_frequencies.py
+++ b/pandas/tests/tseries/frequencies/test_frequencies.py
@@ -2,6 +2,8 @@
 
 from pandas._libs.tslibs import offsets
 
+import pandas as pd
+
 from pandas.tseries.frequencies import (
     is_subperiod,
     is_superperiod,
@@ -27,3 +29,9 @@
 def test_super_sub_symmetry(p1, p2, expected):
     assert is_superperiod(p1, p2) is expected
     assert is_subperiod(p2, p1) is expected
+
+
+def test_deprecated_freq_alias_error():
+    # GH#62259
+    with pytest.raises(ValueError, match="Invalid frequency 'H'.*Did you mean 'h'?"):
+        pd.date_range("2012-01-01", periods=3, freq="H")
diff --git a/pandas/tseries/frequencies.py b/pandas/tseries/frequencies.py
index 88ea1bfa3c6ed..533f0889c1625 100644
--- a/pandas/tseries/frequencies.py
+++ b/pandas/tseries/frequencies.py
@@ -27,7 +27,7 @@
 from pandas._libs.tslibs.offsets import (
     DateOffset,
     Day,
-    to_offset,
+    to_offset as _to_offset,
 )
 from pandas._libs.tslibs.parsing import get_rule_month
 from pandas.util._decorators import cache_readonly
@@ -53,6 +53,12 @@
         TimedeltaIndex,
     )
     from pandas.core.arrays.datetimelike import DatetimeLikeArrayMixin
+
+_DEPRECATED_FREQ_ALIASES = {
+    "H": "h",
+    "T": "min",
+    "S": "s",
+}
 # --------------------------------------------------------------------
 # Offset related functions
 
@@ -600,6 +606,21 @@ def _is_weekly(rule: str) -> bool:
     return rule == "W" or rule.startswith("W-")
 
 
+def to_offset(freq):
+    try:
+        return _to_offset(freq)
+    except Exception as err:
+        if isinstance(freq, str) and freq in _DEPRECATED_FREQ_ALIASES:
+            suggestion = _DEPRECATED_FREQ_ALIASES[freq]
+            raise ValueError(
+                f"Invalid frequency '{freq}'. This alias was deprecated and removed. "
+                f"Did you mean '{suggestion}'?"
+            ) from None
+        raise ValueError(
+            f"Invalid frequency: {freq}, failed to parse with error message: {err}"
+        ) from None
+
+
 __all__ = [
     "Day",
     "get_period_alias",

From 5fe4f9b00d9be0ef20034bf639eeae8af5c69067 Mon Sep 17 00:00:00 2001
From: Aniket Singh Yadav <singhyadavaniket43@gmail.com>
Date: Sat, 6 Sep 2025 11:36:36 +0530
Subject: [PATCH 3/4] ERR: Improve error message for deprecated frequency
 aliases

---
 pandas/core/series.py | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/pandas/core/series.py b/pandas/core/series.py
index 0972cbff8281e..63c9963fb7eac 100644
--- a/pandas/core/series.py
+++ b/pandas/core/series.py
@@ -6073,9 +6073,7 @@ def eq(
         Parameters
         ----------
         other : Series or scalar value
-            The second operand in this operation. Only `np.ndarray`, `list`, `tuple`,
-            and `Series` are considered "list-like" by pandas. All other types will
-            be treated as scalar values.
+            The second operand in this operation.
         level : int or name
             Broadcast across a level, matching Index values on the
             passed MultiIndex level.

From 6dc7249eff875000f6356b575688cd10d99184b2 Mon Sep 17 00:00:00 2001
From: Aniket Singh Yadav <singhyadavaniket43@gmail.com>
Date: Sun, 7 Sep 2025 07:10:30 +0530
Subject: [PATCH 4/4] ERR: Improve error message for deprecated frequency
 aliases

---
 pandas/tseries/frequencies.py | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/pandas/tseries/frequencies.py b/pandas/tseries/frequencies.py
index 533f0889c1625..0f3e73f7b1b03 100644
--- a/pandas/tseries/frequencies.py
+++ b/pandas/tseries/frequencies.py
@@ -613,8 +613,7 @@ def to_offset(freq):
         if isinstance(freq, str) and freq in _DEPRECATED_FREQ_ALIASES:
             suggestion = _DEPRECATED_FREQ_ALIASES[freq]
             raise ValueError(
-                f"Invalid frequency '{freq}'. This alias was deprecated and removed. "
-                f"Did you mean '{suggestion}'?"
+                f"Invalid frequency '{freq}'. Did you mean '{suggestion}'?"
             ) from None
         raise ValueError(
             f"Invalid frequency: {freq}, failed to parse with error message: {err}"