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add type hints for _util
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@ -37,6 +37,9 @@ classifiers = [
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dynamic = [
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"version",
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]
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dependencies = [
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'typing-extensions; python_version < "3.10"',
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]
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[project.optional-dependencies]
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docs = [
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"furo",
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@ -1,21 +1,36 @@
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from __future__ import annotations
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import os
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import sys
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from pathlib import Path
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from typing import Any, NoReturn
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if sys.version_info >= (3, 10):
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from typing import TypeGuard
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else:
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from typing_extensions import TypeGuard
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def is_path(f):
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def is_path(f: Any) -> TypeGuard[bytes | str | Path]:
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return isinstance(f, (bytes, str, Path))
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def is_directory(f):
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def is_directory(f: Any) -> TypeGuard[bytes | str | Path]:
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"""Checks if an object is a string, and that it points to a directory."""
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return is_path(f) and os.path.isdir(f)
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class DeferredError:
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def __init__(self, ex):
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def __init__(self, ex: BaseException):
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self.ex = ex
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def __getattr__(self, elt):
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def __getattr__(self, elt: str) -> NoReturn:
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raise self.ex
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@staticmethod
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def new(ex: BaseException) -> Any:
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"""
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Creates an object that raises the wrapped exception ``ex`` when used,
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and casts it to :py:obj:`~typing.Any` type.
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"""
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return DeferredError(ex)
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