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Describe every TA-Lib C flag in the abstract API #778

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Merged
mario4tier merged 1 commit into from
Oct 23, 2026
Merged

Describe every TA-Lib C flag in the abstract API #778

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7 changes: 6 additions & 1 deletion talib/_abstract.pxi
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Original file line number Diff line number Diff line change
Expand Up @@ -619,6 +619,9 @@ def __get_flags(int flag, dict flags_lookup_dict):

TA_FUNC_FLAGS = {
1: 'A period of 1 performs no smoothing',
2: 'An output is display-shifted',
4: 'Uses a transcendental math function',
8: 'Input must be positive',
16777216: 'Output scale same as input',
33554432: 'Function has a streaming API',
67108864: 'Output is over volume',
Expand Down Expand Up @@ -647,13 +650,15 @@ TA_OUTPUT_FLAGS = {
16: 'Histogram',
32: 'Pattern (Bool)',
64: 'Bull/Bear Pattern (Bearish < 0, Neutral = 0, Bullish > 0)',
128: 'Strength Pattern ([-200..-100] = Bearish, [-100..0] = Getting Bearish, 0 = Neutral, [0..100] = Getting Bullish, [100-200] = Bullish)',
128: 'Confirmation Pattern (+/-200 = this bar confirms an earlier pattern)',
256: 'Output can be positive',
512: 'Output can be negative',
1024: 'Output can be zero',
2048: 'Values represent an upper limit',
4096: 'Values represent a lower limit',
8192: 'Output is optional (nullable)',
16384: 'Output is display-shifted',
32768: 'Weak Pattern (+/-80 = a weaker form of the pattern)',
}

def _ta_getFuncInfo(char *function_name):
Expand Down
34 changes: 34 additions & 0 deletions tests/test_abstract.py
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Expand Up @@ -174,6 +174,40 @@ def test_info():
assert expected == abstract.Function('BBANDS').info


_TA_VERSION = tuple(int(p) for p in talib.__ta_version__.split()[0].split(b'.'))


@pytest.mark.skipif(_TA_VERSION < (0, 8, 2),
reason='these flags are newer than TA-Lib C 0.8.1')
def test_flags_newer_than_0_8_1():
pattern = ['Line',
'Bull/Bear Pattern (Bearish < 0, Neutral = 0, Bullish > 0)',
'Output can be positive',
'Output can be negative',
'Output can be zero']
assert abstract.Function('CDLENGULFING').output_flags == OrderedDict([
('integer', pattern + ['Weak Pattern (+/-80 = a weaker form of the pattern)']),
])
assert abstract.Function('CDLHIKKAKE').output_flags == OrderedDict([
('integer', ['Line',
'Bull/Bear Pattern (Bearish < 0, Neutral = 0, Bullish > 0)',
'Confirmation Pattern (+/-200 = this bar confirms an earlier pattern)',
'Output can be positive',
'Output can be negative',
'Output can be zero']),
])

dpo = abstract.Function('DPO')
assert 'An output is display-shifted' in dpo.function_flags
assert dpo.output_flags == OrderedDict([
('real', ['Line', 'Output is display-shifted']),
])

ln_flags = abstract.Function('LN').function_flags
assert 'Uses a transcendental math function' in ln_flags
assert 'Input must be positive' in ln_flags


def test_input_names():
expected = OrderedDict([('price', 'close')])
assert expected == abstract.Function('MAMA').input_names
Expand Down
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