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Python 3.7 support for new typings

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This commit is contained in:
wisp3rwind 2023-06-23 16:33:15 +02:00
parent a84b3542f9
commit e9f3565ced
1 changed files with 14 additions and 8 deletions
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22
beets/dbcore/types.py
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@ -16,8 +16,9 @@
"""
from abc import ABC
import sys
import typing
from typing import Any, cast, Generic, List, TypeVar, Union
from typing import Any, cast, Generic, List, TYPE_CHECKING, TypeVar, Union
from .query import BooleanQuery, FieldQuery, NumericQuery, SubstringQuery
from beets.util import str2bool
@ -25,13 +26,18 @@ from beets.util import str2bool
# Abstract base.
class ModelType(Protocol):
"""Protocol that specifies the required constructor for model types, i.e.
a function that takes any argument and attempts to parse it to the given
type.
"""
def __init__(self, value: Any = None):
...
# FIXME: unconditionally define the Protocol once we drop Python 3.7
if TYPE_CHECKING and sys.version_info >= (3, 8):
class ModelType(typing.Protocol):
"""Protocol that specifies the required constructor for model types,
i.e. a function that takes any argument and attempts to parse it to the
given type.
"""
def __init__(self, value: Any = None):
...
else:
# No structural subtyping in Python < 3.8...
ModelType = Any
# Generic type variables, used for the value type T and null type N (if