Remove from_iso_* functions from utils.py

src/marshmallow/fields.py

@@ -15,6 +15,14 @@
 from collections.abc import Mapping as _Mapping
 from enum import Enum as EnumType
 
+# Remove this when dropping Python 3.10
+try:
+    from backports.datetime_fromisoformat import MonkeyPatch
+except ImportError:
+    pass
+else:
+    MonkeyPatch.patch_fromisoformat()
+
 from marshmallow import class_registry, types, utils, validate
 from marshmallow.base import FieldABC, SchemaABC
 from marshmallow.exceptions import (
@@ -1248,8 +1256,8 @@ class DateTime(Field):
     }  # type: dict[str, typing.Callable[[typing.Any], str | float]]
 
     DESERIALIZATION_FUNCS = {
-        "iso": utils.from_iso_datetime,
-        "iso8601": utils.from_iso_datetime,
+        "iso": dt.datetime.fromisoformat,
+        "iso8601": dt.datetime.fromisoformat,
         "rfc": utils.from_rfc,
         "rfc822": utils.from_rfc,
         "timestamp": utils.from_timestamp,
@@ -1397,7 +1405,10 @@ class Time(DateTime):
 
     SERIALIZATION_FUNCS = {"iso": utils.to_iso_time, "iso8601": utils.to_iso_time}
 
-    DESERIALIZATION_FUNCS = {"iso": utils.from_iso_time, "iso8601": utils.from_iso_time}
+    DESERIALIZATION_FUNCS = {
+        "iso": dt.time.fromisoformat,
+        "iso8601": dt.time.fromisoformat,
+    }
 
     DEFAULT_FORMAT = "iso"
 
@@ -1426,7 +1437,10 @@ class Date(DateTime):
 
     SERIALIZATION_FUNCS = {"iso": utils.to_iso_date, "iso8601": utils.to_iso_date}
 
-    DESERIALIZATION_FUNCS = {"iso": utils.from_iso_date, "iso8601": utils.from_iso_date}
+    DESERIALIZATION_FUNCS = {
+        "iso": dt.date.fromisoformat,
+        "iso8601": dt.date.fromisoformat,
+    }
 
     DEFAULT_FORMAT = "iso"
 

src/marshmallow/utils.py

@@ -13,14 +13,6 @@
 from email.utils import format_datetime, parsedate_to_datetime
 from pprint import pprint as py_pprint
 
-# Remove this when dropping Python 3.10
-try:
-    from backports.datetime_fromisoformat import MonkeyPatch
-except ImportError:
-    pass
-else:
-    MonkeyPatch.patch_fromisoformat()
-
 from marshmallow.base import FieldABC
 from marshmallow.exceptions import FieldInstanceResolutionError
 from marshmallow.warnings import RemovedInMarshmallow4Warning
@@ -133,28 +125,6 @@ def get_fixed_timezone(offset: int | float | dt.timedelta) -> dt.timezone:
     return dt.timezone(dt.timedelta(minutes=offset), name)
 
 
-def from_iso_datetime(value):
-    """Parse a string and return a datetime.datetime.
-
-    This function supports time zone offsets. When the input contains one,
-    the output uses a timezone with a fixed offset from UTC.
-    """
-    return dt.datetime.fromisoformat(value)
-
-
-def from_iso_time(value):
-    """Parse a string and return a datetime.time.
-
-    This function doesn't support time zone offsets.
-    """
-    return dt.time.fromisoformat(value)
-
-
-def from_iso_date(value):
-    """Parse a string and return a datetime.date."""
-    return dt.date.fromisoformat(value)
-
-
 def from_timestamp(value: typing.Any) -> dt.datetime:
     if value is True or value is False:
         raise ValueError("Not a valid POSIX timestamp")

tests/test_utils.py

@@ -6,7 +6,7 @@
 import pytest
 
 from marshmallow import Schema, fields, utils
-from tests.base import assert_date_equal, assert_time_equal, central
+from tests.base import central
 
 
 def test_missing_singleton_copy():
@@ -175,59 +175,6 @@ def test_from_rfc(value, expected):
     assert result == expected
 
 
-@pytest.mark.parametrize(
-    ("value", "expected"),
-    [
-        ("2013-11-10T01:23:45", dt.datetime(2013, 11, 10, 1, 23, 45)),
-        (
-            "2013-11-10T01:23:45+00:00",
-            dt.datetime(2013, 11, 10, 1, 23, 45, tzinfo=dt.timezone.utc),
-        ),
-        (
-            # Regression test for https://github.com/marshmallow-code/marshmallow/issues/1251
-            "2013-11-10T01:23:45.123+00:00",
-            dt.datetime(2013, 11, 10, 1, 23, 45, 123000, tzinfo=dt.timezone.utc),
-        ),
-        (
-            "2013-11-10T01:23:45.123456+00:00",
-            dt.datetime(2013, 11, 10, 1, 23, 45, 123456, tzinfo=dt.timezone.utc),
-        ),
-        (
-            "2013-11-10T01:23:45-06:00",
-            dt.datetime(2013, 11, 10, 1, 23, 45, tzinfo=central),
-        ),
-    ],
-)
-def test_from_iso_datetime(value, expected):
-    result = utils.from_iso_datetime(value)
-    assert type(result) is dt.datetime
-    assert result == expected
-
-
-def test_from_iso_time_with_microseconds():
-    t = dt.time(1, 23, 45, 6789)
-    formatted = t.isoformat()
-    result = utils.from_iso_time(formatted)
-    assert type(result) is dt.time
-    assert_time_equal(result, t)
-
-
-def test_from_iso_time_without_microseconds():
-    t = dt.time(1, 23, 45)
-    formatted = t.isoformat()
-    result = utils.from_iso_time(formatted)
-    assert type(result) is dt.time
-    assert_time_equal(result, t)
-
-
-def test_from_iso_date():
-    d = dt.date(2014, 8, 21)
-    iso_date = d.isoformat()
-    result = utils.from_iso_date(iso_date)
-    assert type(result) is dt.date
-    assert_date_equal(result, d)
-
-
 @pytest.mark.parametrize(
     ("value", "expected"),
     [