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data	[ DIR ]	drwxr-xr-x
examples	[ DIR ]	drwxr-xr-x
__init__.py	0 B	-rw-r--r--
_locales.py	2.14 KB	-rw-r--r--
test__exceptions.py	1.96 KB	-rw-r--r--
test_abc.py	2.27 KB	-rw-r--r--
test_api.py	21.76 KB	-rw-r--r--
test_argparse.py	1.93 KB	-rw-r--r--
test_array_coercion.py	27.27 KB	-rw-r--r--
test_arraymethod.py	2.34 KB	-rw-r--r--
test_arrayprint.py	36.3 KB	-rw-r--r--
test_casting_unittests.py	27.19 KB	-rw-r--r--
test_conversion_utils.py	6.26 KB	-rw-r--r--
test_cpu_dispatcher.py	1.48 KB	-rw-r--r--
test_cpu_features.py	6.62 KB	-rw-r--r--
test_cython.py	3.45 KB	-rw-r--r--
test_datetime.py	109.93 KB	-rw-r--r--
test_defchararray.py	24.01 KB	-rw-r--r--
test_deprecations.py	44.47 KB	-rw-r--r--
test_dtype.py	59.15 KB	-rw-r--r--
test_einsum.py	47.9 KB	-rw-r--r--
test_errstate.py	2.02 KB	-rw-r--r--
test_extint128.py	5.51 KB	-rw-r--r--
test_function_base.py	14.07 KB	-rw-r--r--
test_getlimits.py	4.2 KB	-rw-r--r--
test_half.py	23.26 KB	-rw-r--r--
test_indexerrors.py	5.01 KB	-rw-r--r--
test_indexing.py	52.71 KB	-rw-r--r--
test_item_selection.py	3.5 KB	-rw-r--r--
test_longdouble.py	12.74 KB	-rw-r--r--
test_machar.py	1.04 KB	-rw-r--r--
test_mem_overlap.py	28.4 KB	-rw-r--r--
test_memmap.py	7.29 KB	-rw-r--r--
test_multiarray.py	328.73 KB	-rw-r--r--
test_nditer.py	124.75 KB	-rw-r--r--
test_numeric.py	132.07 KB	-rw-r--r--
test_numerictypes.py	20.36 KB	-rw-r--r--
test_overrides.py	19.66 KB	-rw-r--r--
test_print.py	6.58 KB	-rw-r--r--
test_protocols.py	1.14 KB	-rw-r--r--
test_records.py	19.79 KB	-rw-r--r--
test_regression.py	88.97 KB	-rw-r--r--
test_scalar_ctors.py	3.6 KB	-rw-r--r--
test_scalar_methods.py	4 KB	-rw-r--r--
test_scalarbuffer.py	5.5 KB	-rw-r--r--
test_scalarinherit.py	2.35 KB	-rw-r--r--
test_scalarmath.py	31.92 KB	-rw-r--r--
test_scalarprint.py	18.21 KB	-rw-r--r--
test_shape_base.py	26.61 KB	-rw-r--r--
test_simd.py	34.55 KB	-rw-r--r--
test_simd_module.py	3.67 KB	-rw-r--r--
test_ufunc.py	92.25 KB	-rw-r--r--
test_umath.py	137.25 KB	-rw-r--r--
test_umath_accuracy.py	3.04 KB	-rw-r--r--
test_umath_complex.py	22.76 KB	-rw-r--r--
test_unicode.py	12.26 KB	-rw-r--r--

Code Editor : test_scalar_methods.py

"""
Test the scalar constructors, which also do type-coercion
"""
import fractions
import platform

import pytest
import numpy as np

from numpy.testing import assert_equal, assert_raises

class TestAsIntegerRatio:
    # derived in part from the cpython test "test_floatasratio"

@pytest.mark.parametrize("ftype", [
        np.half, np.single, np.double, np.longdouble])
    @pytest.mark.parametrize("f, ratio", [
        (0.875, (7, 8)),
        (-0.875, (-7, 8)),
        (0.0, (0, 1)),
        (11.5, (23, 2)),
        ])
    def test_small(self, ftype, f, ratio):
        assert_equal(ftype(f).as_integer_ratio(), ratio)

@pytest.mark.parametrize("ftype", [
        np.half, np.single, np.double, np.longdouble])
    def test_simple_fractions(self, ftype):
        R = fractions.Fraction
        assert_equal(R(0, 1),
                     R(*ftype(0.0).as_integer_ratio()))
        assert_equal(R(5, 2),
                     R(*ftype(2.5).as_integer_ratio()))
        assert_equal(R(1, 2),
                     R(*ftype(0.5).as_integer_ratio()))
        assert_equal(R(-2100, 1),
                     R(*ftype(-2100.0).as_integer_ratio()))

@pytest.mark.parametrize("ftype", [
        np.half, np.single, np.double, np.longdouble])
    def test_errors(self, ftype):
        assert_raises(OverflowError, ftype('inf').as_integer_ratio)
        assert_raises(OverflowError, ftype('-inf').as_integer_ratio)
        assert_raises(ValueError, ftype('nan').as_integer_ratio)

def test_against_known_values(self):
        R = fractions.Fraction
        assert_equal(R(1075, 512),
                     R(*np.half(2.1).as_integer_ratio()))
        assert_equal(R(-1075, 512),
                     R(*np.half(-2.1).as_integer_ratio()))
        assert_equal(R(4404019, 2097152),
                     R(*np.single(2.1).as_integer_ratio()))
        assert_equal(R(-4404019, 2097152),
                     R(*np.single(-2.1).as_integer_ratio()))
        assert_equal(R(4728779608739021, 2251799813685248),
                     R(*np.double(2.1).as_integer_ratio()))
        assert_equal(R(-4728779608739021, 2251799813685248),
                     R(*np.double(-2.1).as_integer_ratio()))
        # longdouble is platform dependent

@pytest.mark.parametrize("ftype, frac_vals, exp_vals", [
        # dtype test cases generated using hypothesis
        # first five generated cases per dtype
        (np.half, [0.0, 0.01154830649280303, 0.31082276347447274,
                   0.527350517124794, 0.8308562335072596],
                  [0, 1, 0, -8, 12]),
        (np.single, [0.0, 0.09248576989263226, 0.8160498218131407,
                     0.17389442853722373, 0.7956044195067877],
                    [0, 12, 10, 17, -26]),
        (np.double, [0.0, 0.031066908499895136, 0.5214135908877832,
                     0.45780736035689296, 0.5906586745934036],
                    [0, -801, 51, 194, -653]),
        pytest.param(
            np.longdouble,
            [0.0, 0.20492557202724854, 0.4277180662199366, 0.9888085019891495,
             0.9620175814461964],
            [0, -7400, 14266, -7822, -8721],
            marks=[
                pytest.mark.skipif(
                    np.finfo(np.double) == np.finfo(np.longdouble),
                    reason="long double is same as double"),
                pytest.mark.skipif(
                    platform.machine().startswith("ppc"),
                    reason="IBM double double"),
            ]
        )
    ])
    def test_roundtrip(self, ftype, frac_vals, exp_vals):
        for frac, exp in zip(frac_vals, exp_vals):
            f = np.ldexp(ftype(frac), exp)
            assert f.dtype == ftype
            n, d = f.as_integer_ratio()

try:
                # workaround for gh-9968
                nf = np.longdouble(str(n))
                df = np.longdouble(str(d))
            except (OverflowError, RuntimeWarning):
                # the values may not fit in any float type
                pytest.skip("longdouble too small on this platform")

assert_equal(nf / df, f, "{}/{}".format(n, d))

${this.title}

Code Editor : test_scalar_methods.py