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ENH: clarify error message when passing the removed year frequencies 'AS-JAN' #63047

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ENH: clarify error message when passing the removed year frequencies 'AS-JAN' #63047

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26 changes: 26 additions & 0 deletions pandas/_libs/tslibs/offsets.pyx
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Original file line number Diff line number Diff line change
Expand Up @@ -5202,6 +5202,32 @@ deprec_to_valid_alias = {
"L": "ms",
"U": "us",
"N": "ns",
"AS": "YS",
"AS-JAN": "YS-JAN",
"AS-FEB": "YS-FEB",
"AS-MAR": "YS-MAR",
"AS-APR": "YS-APR",
"AS-MAY": "YS-MAY",
"AS-JUN": "YS-JUN",
"AS-JUL": "YS-JUL",
"AS-AUG": "YS-AUG",
"AS-SEP": "YS-SEP",
"AS-OCT": "YS-OCT",
"AS-NOV": "YS-NOV",
"AS-DEC": "YS-DEC",
"A": "Y",
"A-JAN": "Y-JAN",
"A-FEB": "Y-FEB",
"A-MAR": "Y-MAR",
"A-APR": "Y-APR",
"A-MAY": "Y-MAY",
"A-JUN": "Y-JUN",
"A-JUL": "Y-JUL",
"A-AUG": "Y-AUG",
"A-SEP": "Y-SEP",
"A-OCT": "Y-OCT",
"A-NOV": "Y-NOV",
"A-DEC": "Y-DEC",
}


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16 changes: 16 additions & 0 deletions pandas/tests/indexes/datetimes/test_date_range.py
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Expand Up @@ -814,6 +814,22 @@ def test_date_range_depr_lowercase_frequency(self, freq, freq_depr):
result = date_range("1/1/2000", periods=4, freq=freq_depr)
tm.assert_index_equal(result, expected)

@pytest.mark.parametrize(
"freq_removed,freq",
[
("100A", "Y"),
("2A-DEC", "Y-DEC"),
("100AS", "YS"),
("2AS-MAY", "YS-MAY"),
],
)
def test_error_message_for_removed_year_yearbegin_frequencies(
self, freq, freq_removed
):
msg = f"Did you mean {freq}"
with pytest.raises(ValueError, match=msg):
date_range("1/1/2000", periods=2, freq=freq_removed)


class TestDateRangeTZ:
"""Tests for date_range with timezones"""
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