From e4f0a4c373022527cacd6c1b6db441cbe8663ec5 Mon Sep 17 00:00:00 2001 From: Iva Miholic Date: Sun, 16 Jul 2017 09:04:35 +0100 Subject: [PATCH] ENH: Create a 'Y' alias for end of year Closes gh-9313 --- pandas/tests/tseries/test_frequencies.py | 41 ++++++++++++++++-------- pandas/tseries/frequencies.py | 22 +++++++++++++ 2 files changed, 50 insertions(+), 13 deletions(-) diff --git a/pandas/tests/tseries/test_frequencies.py b/pandas/tests/tseries/test_frequencies.py index 54d12317b0bf8..4bcd0b49db7e0 100644 --- a/pandas/tests/tseries/test_frequencies.py +++ b/pandas/tests/tseries/test_frequencies.py @@ -248,9 +248,10 @@ def test_anchored_shortcuts(self): # ensure invalid cases fail as expected invalid_anchors = ['SM-0', 'SM-28', 'SM-29', - 'SM-FOO', 'BSM', 'SM--1' + 'SM-FOO', 'BSM', 'SM--1', 'SMS-1', 'SMS-28', 'SMS-30', - 'SMS-BAR', 'BSMS', 'SMS--2'] + 'SMS-BAR', 'SMS-BYR' 'BSMS', + 'SMS--2'] for invalid_anchor in invalid_anchors: with tm.assert_raises_regex(ValueError, 'Invalid frequency: '): @@ -292,11 +293,15 @@ def test_get_rule_month(): result = frequencies._get_rule_month('A-DEC') assert (result == 'DEC') + result = frequencies._get_rule_month('Y-DEC') + assert (result == 'DEC') result = frequencies._get_rule_month(offsets.YearEnd()) assert (result == 'DEC') result = frequencies._get_rule_month('A-MAY') assert (result == 'MAY') + result = frequencies._get_rule_month('Y-MAY') + assert (result == 'MAY') result = frequencies._get_rule_month(offsets.YearEnd(month=5)) assert (result == 'MAY') @@ -305,6 +310,10 @@ def test_period_str_to_code(): assert (frequencies._period_str_to_code('A') == 1000) assert (frequencies._period_str_to_code('A-DEC') == 1000) assert (frequencies._period_str_to_code('A-JAN') == 1001) + assert (frequencies._period_str_to_code('Y') == 1000) + assert (frequencies._period_str_to_code('Y-DEC') == 1000) + assert (frequencies._period_str_to_code('Y-JAN') == 1001) + assert (frequencies._period_str_to_code('Q') == 2000) assert (frequencies._period_str_to_code('Q-DEC') == 2000) assert (frequencies._period_str_to_code('Q-FEB') == 2002) @@ -349,6 +358,10 @@ def test_freq_code(self): assert frequencies.get_freq('3A') == 1000 assert frequencies.get_freq('-1A') == 1000 + assert frequencies.get_freq('Y') == 1000 + assert frequencies.get_freq('3Y') == 1000 + assert frequencies.get_freq('-1Y') == 1000 + assert frequencies.get_freq('W') == 4000 assert frequencies.get_freq('W-MON') == 4001 assert frequencies.get_freq('W-FRI') == 4005 @@ -369,6 +382,13 @@ def test_freq_group(self): assert frequencies.get_freq_group('-1A') == 1000 assert frequencies.get_freq_group('A-JAN') == 1000 assert frequencies.get_freq_group('A-MAY') == 1000 + + assert frequencies.get_freq_group('Y') == 1000 + assert frequencies.get_freq_group('3Y') == 1000 + assert frequencies.get_freq_group('-1Y') == 1000 + assert frequencies.get_freq_group('Y-JAN') == 1000 + assert frequencies.get_freq_group('Y-MAY') == 1000 + assert frequencies.get_freq_group(offsets.YearEnd()) == 1000 assert frequencies.get_freq_group(offsets.YearEnd(month=1)) == 1000 assert frequencies.get_freq_group(offsets.YearEnd(month=5)) == 1000 @@ -790,12 +810,6 @@ def test_series(self): for freq in [None, 'L']: s = Series(period_range('2013', periods=10, freq=freq)) pytest.raises(TypeError, lambda: frequencies.infer_freq(s)) - for freq in ['Y']: - - msg = frequencies._INVALID_FREQ_ERROR - with tm.assert_raises_regex(ValueError, msg): - s = Series(period_range('2013', periods=10, freq=freq)) - pytest.raises(TypeError, lambda: frequencies.infer_freq(s)) # DateTimeIndex for freq in ['M', 'L', 'S']: @@ -812,11 +826,12 @@ def test_legacy_offset_warnings(self): 'W@FRI', 'W@SAT', 'W@SUN', 'Q@JAN', 'Q@FEB', 'Q@MAR', 'A@JAN', 'A@FEB', 'A@MAR', 'A@APR', 'A@MAY', 'A@JUN', 'A@JUL', 'A@AUG', 'A@SEP', 'A@OCT', 'A@NOV', 'A@DEC', - 'WOM@1MON', 'WOM@2MON', 'WOM@3MON', 'WOM@4MON', - 'WOM@1TUE', 'WOM@2TUE', 'WOM@3TUE', 'WOM@4TUE', - 'WOM@1WED', 'WOM@2WED', 'WOM@3WED', 'WOM@4WED', - 'WOM@1THU', 'WOM@2THU', 'WOM@3THU', 'WOM@4THU' - 'WOM@1FRI', 'WOM@2FRI', 'WOM@3FRI', 'WOM@4FRI'] + 'Y@JAN', 'WOM@1MON', 'WOM@2MON', 'WOM@3MON', + 'WOM@4MON', 'WOM@1TUE', 'WOM@2TUE', 'WOM@3TUE', + 'WOM@4TUE', 'WOM@1WED', 'WOM@2WED', 'WOM@3WED', + 'WOM@4WED', 'WOM@1THU', 'WOM@2THU', 'WOM@3THU', + 'WOM@4THU', 'WOM@1FRI', 'WOM@2FRI', 'WOM@3FRI', + 'WOM@4FRI'] msg = frequencies._INVALID_FREQ_ERROR for freq in freqs: diff --git a/pandas/tseries/frequencies.py b/pandas/tseries/frequencies.py index c5f6c00a4005a..5c3c90520d1c3 100644 --- a/pandas/tseries/frequencies.py +++ b/pandas/tseries/frequencies.py @@ -422,6 +422,27 @@ def get_period_alias(offset_str): return _offset_to_period_map.get(offset_str, None) +_pure_alias = { + # 'A' is equivalent to 'Y'. + 'Y': 'A', + 'YS': 'AS', + 'BY': 'BA', + 'BYS': 'BAS', + 'Y-DEC': 'A-DEC', + 'Y-JAN': 'A-JAN', + 'Y-FEB': 'A-FEB', + 'Y-MAR': 'A-MAR', + 'Y-APR': 'A-APR', + 'Y-MAY': 'A-MAY', + 'Y-JUN': 'A-JUN', + 'Y-JUL': 'A-JUL', + 'Y-AUG': 'A-AUG', + 'Y-SEP': 'A-SEP', + 'Y-OCT': 'A-OCT', + 'Y-NOV': 'A-NOV', +} + + _lite_rule_alias = { 'W': 'W-SUN', 'Q': 'Q-DEC', @@ -718,6 +739,7 @@ def get_standard_freq(freq): def _period_str_to_code(freqstr): + freqstr = _pure_alias.get(freqstr, freqstr) freqstr = _lite_rule_alias.get(freqstr, freqstr) if freqstr not in _dont_uppercase: