Add a default value for FieldMeta random args (#232)

polyfactory/constants.py

@@ -1,4 +1,5 @@
 from collections import abc, defaultdict, deque
+from random import Random
 from typing import (
     DefaultDict,
     Deque,
@@ -39,3 +40,5 @@
 }
 
 IGNORED_TYPE_ARGS: Set = {Ellipsis}
+
+DEFAULT_RANDOM = Random()

polyfactory/field_meta.py

@@ -2,7 +2,7 @@
 
 from typing import TYPE_CHECKING, Any, Literal, Pattern, TypedDict, cast
 
-from polyfactory.constants import IGNORED_TYPE_ARGS, TYPE_MAPPING
+from polyfactory.constants import DEFAULT_RANDOM, IGNORED_TYPE_ARGS, TYPE_MAPPING
 from polyfactory.utils.helpers import normalize_annotation, unwrap_annotated, unwrap_args, unwrap_new_type
 from polyfactory.utils.predicates import is_annotated
 
@@ -66,7 +66,7 @@ def __init__(
         *,
         name: str,
         annotation: type,
-        random: Random,
+        random: Random = DEFAULT_RANDOM,
         default: Any = Null,
         children: list[FieldMeta] | None = None,
         constraints: Constraints | None = None,
@@ -83,7 +83,6 @@ def __init__(
     def type_args(self) -> tuple[Any, ...]:
         """Return the normalized type args of the annotation, if any.
 
-        :param random: An instance of random.Random.
         :returns: a tuple of types.
         """
         return tuple(arg for arg in unwrap_args(self.annotation, random=self.random) if arg not in IGNORED_TYPE_ARGS)
@@ -92,7 +91,7 @@ def type_args(self) -> tuple[Any, ...]:
     def from_type(
         cls,
         annotation: Any,
-        random: Random,
+        random: Random = DEFAULT_RANDOM,
         name: str = "",
         default: Any = Null,
         constraints: Constraints | None = None,