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