"""
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Tests that work on both the Python and C engines but do not have a
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specific classification into the other test modules.
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"""
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from io import StringIO
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import numpy as np
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import pytest
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from pandas.compat import is_platform_linux
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from pandas import DataFrame
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import pandas._testing as tm
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pytestmark = pytest.mark.usefixtures("pyarrow_skip")
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def test_float_parser(all_parsers):
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# see gh-9565
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parser = all_parsers
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data = "45e-1,4.5,45.,inf,-inf"
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result = parser.read_csv(StringIO(data), header=None)
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expected = DataFrame([[float(s) for s in data.split(",")]])
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tm.assert_frame_equal(result, expected)
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def test_scientific_no_exponent(all_parsers_all_precisions):
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# see gh-12215
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df = DataFrame.from_dict({"w": ["2e"], "x": ["3E"], "y": ["42e"], "z": ["632E"]})
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data = df.to_csv(index=False)
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parser, precision = all_parsers_all_precisions
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df_roundtrip = parser.read_csv(StringIO(data), float_precision=precision)
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tm.assert_frame_equal(df_roundtrip, df)
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@pytest.mark.parametrize("neg_exp", [-617, -100000, -99999999999999999])
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def test_very_negative_exponent(all_parsers_all_precisions, neg_exp):
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# GH#38753
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parser, precision = all_parsers_all_precisions
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data = f"data\n10E{neg_exp}"
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result = parser.read_csv(StringIO(data), float_precision=precision)
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expected = DataFrame({"data": [0.0]})
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tm.assert_frame_equal(result, expected)
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@pytest.mark.parametrize("exp", [999999999999999999, -999999999999999999])
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def test_too_many_exponent_digits(all_parsers_all_precisions, exp, request):
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# GH#38753
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parser, precision = all_parsers_all_precisions
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data = f"data\n10E{exp}"
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result = parser.read_csv(StringIO(data), float_precision=precision)
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if precision == "round_trip":
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if exp == 999999999999999999 and is_platform_linux():
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mark = pytest.mark.xfail(reason="GH38794, on Linux gives object result")
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request.node.add_marker(mark)
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value = np.inf if exp > 0 else 0.0
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expected = DataFrame({"data": [value]})
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else:
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expected = DataFrame({"data": [f"10E{exp}"]})
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tm.assert_frame_equal(result, expected)
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