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test_parsing.py
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"""
Tests for Timestamp parsing, aimed at pandas/_libs/tslibs/parsing.pyx
"""
from datetime import datetime
import re
from dateutil.parser import parse
import numpy as np
import pytest
from pandas._libs.tslibs import parsing
from pandas._libs.tslibs.parsing import parse_time_string
import pandas.util._test_decorators as td
import pandas._testing as tm
def test_parse_time_string():
(parsed, reso) = parse_time_string("4Q1984")
(parsed_lower, reso_lower) = parse_time_string("4q1984")
assert reso == reso_lower
assert parsed == parsed_lower
def test_parse_time_string_nanosecond_reso():
# GH#46811
parsed, reso = parse_time_string("2022-04-20 09:19:19.123456789")
assert reso == "nanosecond"
def test_parse_time_string_invalid_type():
# Raise on invalid input, don't just return it
msg = "Argument 'arg' has incorrect type (expected str, got tuple)"
with pytest.raises(TypeError, match=re.escape(msg)):
parse_time_string((4, 5))
@pytest.mark.parametrize(
"dashed,normal", [("1988-Q2", "1988Q2"), ("2Q-1988", "2Q1988")]
)
def test_parse_time_quarter_with_dash(dashed, normal):
# see gh-9688
(parsed_dash, reso_dash) = parse_time_string(dashed)
(parsed, reso) = parse_time_string(normal)
assert parsed_dash == parsed
assert reso_dash == reso
@pytest.mark.parametrize("dashed", ["-2Q1992", "2-Q1992", "4-4Q1992"])
def test_parse_time_quarter_with_dash_error(dashed):
msg = f"Unknown datetime string format, unable to parse: {dashed}"
with pytest.raises(parsing.DateParseError, match=msg):
parse_time_string(dashed)
@pytest.mark.parametrize(
"date_string,expected",
[
("123.1234", False),
("-50000", False),
("999", False),
("m", False),
("T", False),
("Mon Sep 16, 2013", True),
("2012-01-01", True),
("01/01/2012", True),
("01012012", True),
("0101", True),
("1-1", True),
],
)
def test_does_not_convert_mixed_integer(date_string, expected):
assert parsing._does_string_look_like_datetime(date_string) is expected
@pytest.mark.parametrize(
"date_str,kwargs,msg",
[
(
"2013Q5",
{},
(
"Incorrect quarterly string is given, "
"quarter must be between 1 and 4: 2013Q5"
),
),
# see gh-5418
(
"2013Q1",
{"freq": "INVLD-L-DEC-SAT"},
(
"Unable to retrieve month information "
"from given freq: INVLD-L-DEC-SAT"
),
),
],
)
def test_parsers_quarterly_with_freq_error(date_str, kwargs, msg):
with pytest.raises(parsing.DateParseError, match=msg):
parsing.parse_time_string(date_str, **kwargs)
@pytest.mark.parametrize(
"date_str,freq,expected",
[
("2013Q2", None, datetime(2013, 4, 1)),
("2013Q2", "A-APR", datetime(2012, 8, 1)),
("2013-Q2", "A-DEC", datetime(2013, 4, 1)),
],
)
def test_parsers_quarterly_with_freq(date_str, freq, expected):
result, _ = parsing.parse_time_string(date_str, freq=freq)
assert result == expected
@pytest.mark.parametrize(
"date_str", ["2Q 2005", "2Q-200A", "2Q-200", "22Q2005", "2Q200.", "6Q-20"]
)
def test_parsers_quarter_invalid(date_str):
if date_str == "6Q-20":
msg = (
"Incorrect quarterly string is given, quarter "
f"must be between 1 and 4: {date_str}"
)
else:
msg = f"Unknown datetime string format, unable to parse: {date_str}"
with pytest.raises(ValueError, match=msg):
parsing.parse_time_string(date_str)
@pytest.mark.parametrize(
"date_str,expected",
[("201101", datetime(2011, 1, 1, 0, 0)), ("200005", datetime(2000, 5, 1, 0, 0))],
)
def test_parsers_month_freq(date_str, expected):
result, _ = parsing.parse_time_string(date_str, freq="M")
assert result == expected
@td.skip_if_not_us_locale
@pytest.mark.parametrize(
"string,fmt",
[
("20111230", "%Y%m%d"),
("2011-12-30", "%Y-%m-%d"),
("30-12-2011", "%d-%m-%Y"),
("2011-12-30 00:00:00", "%Y-%m-%d %H:%M:%S"),
("2011-12-30T00:00:00", "%Y-%m-%dT%H:%M:%S"),
("2011-12-30T00:00:00UTC", "%Y-%m-%dT%H:%M:%S%Z"),
("2011-12-30T00:00:00Z", "%Y-%m-%dT%H:%M:%S%z"),
("2011-12-30T00:00:00+9", None),
("2011-12-30T00:00:00+09", None),
("2011-12-30T00:00:00+090", None),
("2011-12-30T00:00:00+0900", "%Y-%m-%dT%H:%M:%S%z"),
("2011-12-30T00:00:00-0900", "%Y-%m-%dT%H:%M:%S%z"),
("2011-12-30T00:00:00+09:00", "%Y-%m-%dT%H:%M:%S%z"),
("2011-12-30T00:00:00+09:000", None),
("2011-12-30T00:00:00+9:0", None),
("2011-12-30T00:00:00+09:", None),
("2011-12-30T00:00:00.000000UTC", "%Y-%m-%dT%H:%M:%S.%f%Z"),
("2011-12-30T00:00:00.000000Z", "%Y-%m-%dT%H:%M:%S.%f%z"),
("2011-12-30T00:00:00.000000+9", None),
("2011-12-30T00:00:00.000000+09", None),
("2011-12-30T00:00:00.000000+090", None),
("2011-12-30T00:00:00.000000+0900", "%Y-%m-%dT%H:%M:%S.%f%z"),
("2011-12-30T00:00:00.000000-0900", "%Y-%m-%dT%H:%M:%S.%f%z"),
("2011-12-30T00:00:00.000000+09:00", "%Y-%m-%dT%H:%M:%S.%f%z"),
("2011-12-30T00:00:00.000000+09:000", None),
("2011-12-30T00:00:00.000000+9:0", None),
("2011-12-30T00:00:00.000000+09:", None),
("2011-12-30 00:00:00.000000", "%Y-%m-%d %H:%M:%S.%f"),
("Tue 24 Aug 2021 01:30:48 AM", "%a %d %b %Y %H:%M:%S %p"),
("Tuesday 24 Aug 2021 01:30:48 AM", "%A %d %b %Y %H:%M:%S %p"),
],
)
def test_guess_datetime_format_with_parseable_formats(string, fmt):
result = parsing.guess_datetime_format(string)
assert result == fmt
@pytest.mark.parametrize("dayfirst,expected", [(True, "%d/%m/%Y"), (False, "%m/%d/%Y")])
def test_guess_datetime_format_with_dayfirst(dayfirst, expected):
ambiguous_string = "01/01/2011"
result = parsing.guess_datetime_format(ambiguous_string, dayfirst=dayfirst)
assert result == expected
@td.skip_if_not_us_locale
@pytest.mark.parametrize(
"string,fmt",
[
("30/Dec/2011", "%d/%b/%Y"),
("30/December/2011", "%d/%B/%Y"),
("30/Dec/2011 00:00:00", "%d/%b/%Y %H:%M:%S"),
],
)
def test_guess_datetime_format_with_locale_specific_formats(string, fmt):
result = parsing.guess_datetime_format(string)
assert result == fmt
@pytest.mark.parametrize(
"invalid_dt",
[
"2013",
"01/2013",
"12:00:00",
"1/1/1/1",
"this_is_not_a_datetime",
"51a",
],
)
def test_guess_datetime_format_invalid_inputs(invalid_dt):
# A datetime string must include a year, month and a day for it to be
# guessable, in addition to being a string that looks like a datetime.
assert parsing.guess_datetime_format(invalid_dt) is None
@pytest.mark.parametrize("invalid_type_dt", [9, datetime(2011, 1, 1)])
def test_guess_datetime_format_wrong_type_inputs(invalid_type_dt):
# A datetime string must include a year, month and a day for it to be
# guessable, in addition to being a string that looks like a datetime.
with pytest.raises(
TypeError,
match=r"^Argument 'dt_str' has incorrect type \(expected str, got .*\)$",
):
parsing.guess_datetime_format(invalid_type_dt)
@pytest.mark.parametrize(
"string,fmt",
[
("2011-1-1", "%Y-%m-%d"),
("1/1/2011", "%m/%d/%Y"),
("30-1-2011", "%d-%m-%Y"),
("2011-1-1 0:0:0", "%Y-%m-%d %H:%M:%S"),
("2011-1-3T00:00:0", "%Y-%m-%dT%H:%M:%S"),
("2011-1-1 00:00:00", "%Y-%m-%d %H:%M:%S"),
],
)
def test_guess_datetime_format_no_padding(string, fmt):
# see gh-11142
result = parsing.guess_datetime_format(string)
assert result == fmt
def test_try_parse_dates():
arr = np.array(["5/1/2000", "6/1/2000", "7/1/2000"], dtype=object)
result = parsing.try_parse_dates(arr, dayfirst=True)
expected = np.array([parse(d, dayfirst=True) for d in arr])
tm.assert_numpy_array_equal(result, expected)
def test_parse_time_string_check_instance_type_raise_exception():
# issue 20684
msg = "Argument 'arg' has incorrect type (expected str, got tuple)"
with pytest.raises(TypeError, match=re.escape(msg)):
parse_time_string((1, 2, 3))
result = parse_time_string("2019")
expected = (datetime(2019, 1, 1), "year")
assert result == expected
@pytest.mark.parametrize(
"fmt,expected",
[
("%Y %m %d %H:%M:%S", True),
("%Y/%m/%d %H:%M:%S", True),
(r"%Y\%m\%d %H:%M:%S", True),
("%Y-%m-%d %H:%M:%S", True),
("%Y.%m.%d %H:%M:%S", True),
("%Y%m%d %H:%M:%S", True),
("%Y-%m-%dT%H:%M:%S", True),
("%Y-%m-%dT%H:%M:%S%z", True),
("%Y-%m-%dT%H:%M:%S%Z", True),
("%Y-%m-%dT%H:%M:%S.%f", True),
("%Y-%m-%dT%H:%M:%S.%f%z", True),
("%Y-%m-%dT%H:%M:%S.%f%Z", True),
("%Y%m%d", False),
("%Y%m", False),
("%Y", False),
("%Y-%m-%d", True),
("%Y-%m", True),
],
)
def test_is_iso_format(fmt, expected):
# see gh-41047
result = parsing.format_is_iso(fmt)
assert result == expected