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146 lines
4.1 KiB
146 lines
4.1 KiB
"""
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Tests that dialects are properly handled during parsing
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for all of the parsers defined in parsers.py
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"""
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import csv
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from io import StringIO
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import pytest
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from pandas.errors import ParserWarning
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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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@pytest.fixture
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def custom_dialect():
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dialect_name = "weird"
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dialect_kwargs = {
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"doublequote": False,
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"escapechar": "~",
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"delimiter": ":",
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"skipinitialspace": False,
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"quotechar": "~",
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"quoting": 3,
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}
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return dialect_name, dialect_kwargs
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def test_dialect(all_parsers):
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parser = all_parsers
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data = """\
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label1,label2,label3
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index1,"a,c,e
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index2,b,d,f
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"""
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dia = csv.excel()
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dia.quoting = csv.QUOTE_NONE
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df = parser.read_csv(StringIO(data), dialect=dia)
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data = """\
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label1,label2,label3
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index1,a,c,e
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index2,b,d,f
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"""
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exp = parser.read_csv(StringIO(data))
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exp.replace("a", '"a', inplace=True)
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tm.assert_frame_equal(df, exp)
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def test_dialect_str(all_parsers):
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dialect_name = "mydialect"
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parser = all_parsers
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data = """\
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fruit:vegetable
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apple:broccoli
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pear:tomato
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"""
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exp = DataFrame({"fruit": ["apple", "pear"], "vegetable": ["broccoli", "tomato"]})
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with tm.with_csv_dialect(dialect_name, delimiter=":"):
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df = parser.read_csv(StringIO(data), dialect=dialect_name)
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tm.assert_frame_equal(df, exp)
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def test_invalid_dialect(all_parsers):
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class InvalidDialect:
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pass
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data = "a\n1"
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parser = all_parsers
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msg = "Invalid dialect"
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with pytest.raises(ValueError, match=msg):
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parser.read_csv(StringIO(data), dialect=InvalidDialect)
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@pytest.mark.parametrize(
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"arg",
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[None, "doublequote", "escapechar", "skipinitialspace", "quotechar", "quoting"],
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)
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@pytest.mark.parametrize("value", ["dialect", "default", "other"])
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def test_dialect_conflict_except_delimiter(all_parsers, custom_dialect, arg, value):
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# see gh-23761.
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dialect_name, dialect_kwargs = custom_dialect
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parser = all_parsers
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expected = DataFrame({"a": [1], "b": [2]})
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data = "a:b\n1:2"
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warning_klass = None
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kwds = {}
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# arg=None tests when we pass in the dialect without any other arguments.
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if arg is not None:
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if "value" == "dialect": # No conflict --> no warning.
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kwds[arg] = dialect_kwargs[arg]
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elif "value" == "default": # Default --> no warning.
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from pandas.io.parsers.base_parser import parser_defaults
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kwds[arg] = parser_defaults[arg]
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else: # Non-default + conflict with dialect --> warning.
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warning_klass = ParserWarning
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kwds[arg] = "blah"
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with tm.with_csv_dialect(dialect_name, **dialect_kwargs):
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with tm.assert_produces_warning(warning_klass):
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result = parser.read_csv(StringIO(data), dialect=dialect_name, **kwds)
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tm.assert_frame_equal(result, expected)
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@pytest.mark.parametrize(
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"kwargs,warning_klass",
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[
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({"sep": ","}, None), # sep is default --> sep_override=True
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({"sep": "."}, ParserWarning), # sep isn't default --> sep_override=False
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({"delimiter": ":"}, None), # No conflict
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({"delimiter": None}, None), # Default arguments --> sep_override=True
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({"delimiter": ","}, ParserWarning), # Conflict
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({"delimiter": "."}, ParserWarning), # Conflict
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],
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ids=[
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"sep-override-true",
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"sep-override-false",
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"delimiter-no-conflict",
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"delimiter-default-arg",
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"delimiter-conflict",
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"delimiter-conflict2",
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],
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)
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def test_dialect_conflict_delimiter(all_parsers, custom_dialect, kwargs, warning_klass):
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# see gh-23761.
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dialect_name, dialect_kwargs = custom_dialect
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parser = all_parsers
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expected = DataFrame({"a": [1], "b": [2]})
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data = "a:b\n1:2"
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with tm.with_csv_dialect(dialect_name, **dialect_kwargs):
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with tm.assert_produces_warning(warning_klass):
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result = parser.read_csv(StringIO(data), dialect=dialect_name, **kwargs)
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tm.assert_frame_equal(result, expected)
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