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287 lines
7.5 KiB
287 lines
7.5 KiB
from __future__ import annotations
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import os
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import pytest
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from pandas.compat._optional import VERSIONS
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from pandas import (
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read_csv,
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read_table,
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)
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import pandas._testing as tm
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class BaseParser:
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engine: str | None = None
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low_memory = True
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float_precision_choices: list[str | None] = []
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def update_kwargs(self, kwargs):
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kwargs = kwargs.copy()
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kwargs.update({"engine": self.engine, "low_memory": self.low_memory})
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return kwargs
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def read_csv(self, *args, **kwargs):
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kwargs = self.update_kwargs(kwargs)
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return read_csv(*args, **kwargs)
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def read_csv_check_warnings(
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self, warn_type: type[Warning], warn_msg: str, *args, **kwargs
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):
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# We need to check the stacklevel here instead of in the tests
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# since this is where read_csv is called and where the warning
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# should point to.
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kwargs = self.update_kwargs(kwargs)
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with tm.assert_produces_warning(warn_type, match=warn_msg):
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return read_csv(*args, **kwargs)
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def read_table(self, *args, **kwargs):
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kwargs = self.update_kwargs(kwargs)
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return read_table(*args, **kwargs)
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class CParser(BaseParser):
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engine = "c"
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float_precision_choices = [None, "high", "round_trip"]
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class CParserHighMemory(CParser):
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low_memory = False
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class CParserLowMemory(CParser):
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low_memory = True
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class PythonParser(BaseParser):
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engine = "python"
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float_precision_choices = [None]
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class PyArrowParser(BaseParser):
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engine = "pyarrow"
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float_precision_choices = [None]
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@pytest.fixture
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def csv_dir_path(datapath):
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"""
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The directory path to the data files needed for parser tests.
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"""
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return datapath("io", "parser", "data")
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@pytest.fixture
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def csv1(datapath):
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"""
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The path to the data file "test1.csv" needed for parser tests.
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"""
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return os.path.join(datapath("io", "data", "csv"), "test1.csv")
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_cParserHighMemory = CParserHighMemory
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_cParserLowMemory = CParserLowMemory
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_pythonParser = PythonParser
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_pyarrowParser = PyArrowParser
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_py_parsers_only = [_pythonParser]
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_c_parsers_only = [_cParserHighMemory, _cParserLowMemory]
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_pyarrow_parsers_only = [pytest.param(_pyarrowParser, marks=pytest.mark.single_cpu)]
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_all_parsers = [*_c_parsers_only, *_py_parsers_only, *_pyarrow_parsers_only]
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_py_parser_ids = ["python"]
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_c_parser_ids = ["c_high", "c_low"]
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_pyarrow_parsers_ids = ["pyarrow"]
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_all_parser_ids = [*_c_parser_ids, *_py_parser_ids, *_pyarrow_parsers_ids]
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@pytest.fixture(params=_all_parsers, ids=_all_parser_ids)
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def all_parsers(request):
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"""
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Fixture all of the CSV parsers.
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"""
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parser = request.param()
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if parser.engine == "pyarrow":
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pytest.importorskip("pyarrow", VERSIONS["pyarrow"])
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# Try finding a way to disable threads all together
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# for more stable CI runs
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import pyarrow
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pyarrow.set_cpu_count(1)
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return parser
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@pytest.fixture(params=_c_parsers_only, ids=_c_parser_ids)
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def c_parser_only(request):
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"""
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Fixture all of the CSV parsers using the C engine.
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"""
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return request.param()
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@pytest.fixture(params=_py_parsers_only, ids=_py_parser_ids)
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def python_parser_only(request):
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"""
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Fixture all of the CSV parsers using the Python engine.
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"""
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return request.param()
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@pytest.fixture(params=_pyarrow_parsers_only, ids=_pyarrow_parsers_ids)
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def pyarrow_parser_only(request):
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"""
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Fixture all of the CSV parsers using the Pyarrow engine.
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"""
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return request.param()
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def _get_all_parser_float_precision_combinations():
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"""
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Return all allowable parser and float precision
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combinations and corresponding ids.
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"""
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params = []
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ids = []
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for parser, parser_id in zip(_all_parsers, _all_parser_ids):
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if hasattr(parser, "values"):
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# Wrapped in pytest.param, get the actual parser back
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parser = parser.values[0]
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for precision in parser.float_precision_choices:
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# Re-wrap in pytest.param for pyarrow
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mark = pytest.mark.single_cpu if parser.engine == "pyarrow" else ()
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param = pytest.param((parser(), precision), marks=mark)
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params.append(param)
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ids.append(f"{parser_id}-{precision}")
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return {"params": params, "ids": ids}
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@pytest.fixture(
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params=_get_all_parser_float_precision_combinations()["params"],
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ids=_get_all_parser_float_precision_combinations()["ids"],
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)
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def all_parsers_all_precisions(request):
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"""
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Fixture for all allowable combinations of parser
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and float precision
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"""
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return request.param
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_utf_values = [8, 16, 32]
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_encoding_seps = ["", "-", "_"]
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_encoding_prefixes = ["utf", "UTF"]
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_encoding_fmts = [
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f"{prefix}{sep}" + "{0}" for sep in _encoding_seps for prefix in _encoding_prefixes
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]
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@pytest.fixture(params=_utf_values)
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def utf_value(request):
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"""
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Fixture for all possible integer values for a UTF encoding.
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"""
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return request.param
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@pytest.fixture(params=_encoding_fmts)
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def encoding_fmt(request):
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"""
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Fixture for all possible string formats of a UTF encoding.
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"""
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return request.param
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@pytest.fixture(
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params=[
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("-1,0", -1.0),
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("-1,2e0", -1.2),
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("-1e0", -1.0),
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("+1e0", 1.0),
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("+1e+0", 1.0),
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("+1e-1", 0.1),
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("+,1e1", 1.0),
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("+1,e0", 1.0),
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("-,1e1", -1.0),
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("-1,e0", -1.0),
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("0,1", 0.1),
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("1,", 1.0),
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(",1", 0.1),
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("-,1", -0.1),
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("1_,", 1.0),
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("1_234,56", 1234.56),
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("1_234,56e0", 1234.56),
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# negative cases; must not parse as float
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("_", "_"),
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("-_", "-_"),
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("-_1", "-_1"),
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("-_1e0", "-_1e0"),
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("_1", "_1"),
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("_1,", "_1,"),
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("_1,_", "_1,_"),
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("_1e0", "_1e0"),
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("1,2e_1", "1,2e_1"),
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("1,2e1_0", "1,2e1_0"),
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("1,_2", "1,_2"),
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(",1__2", ",1__2"),
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(",1e", ",1e"),
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("-,1e", "-,1e"),
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("1_000,000_000", "1_000,000_000"),
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("1,e1_2", "1,e1_2"),
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("e11,2", "e11,2"),
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("1e11,2", "1e11,2"),
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("1,2,2", "1,2,2"),
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("1,2_1", "1,2_1"),
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("1,2e-10e1", "1,2e-10e1"),
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("--1,2", "--1,2"),
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("1a_2,1", "1a_2,1"),
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("1,2E-1", 0.12),
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("1,2E1", 12.0),
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]
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)
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def numeric_decimal(request):
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"""
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Fixture for all numeric formats which should get recognized. The first entry
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represents the value to read while the second represents the expected result.
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"""
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return request.param
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@pytest.fixture
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def pyarrow_xfail(request):
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"""
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Fixture that xfails a test if the engine is pyarrow.
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"""
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if "all_parsers" in request.fixturenames:
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parser = request.getfixturevalue("all_parsers")
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elif "all_parsers_all_precisions" in request.fixturenames:
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# Return value is tuple of (engine, precision)
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parser = request.getfixturevalue("all_parsers_all_precisions")[0]
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else:
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return
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if parser.engine == "pyarrow":
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mark = pytest.mark.xfail(reason="pyarrow doesn't support this.")
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request.node.add_marker(mark)
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@pytest.fixture
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def pyarrow_skip(request):
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"""
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Fixture that skips a test if the engine is pyarrow.
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"""
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if "all_parsers" in request.fixturenames:
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parser = request.getfixturevalue("all_parsers")
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elif "all_parsers_all_precisions" in request.fixturenames:
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# Return value is tuple of (engine, precision)
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parser = request.getfixturevalue("all_parsers_all_precisions")[0]
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else:
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return
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if parser.engine == "pyarrow":
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pytest.skip("pyarrow doesn't support this.")
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