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"""
Python polyfills for os
"""
from __future__ import annotations
import os
from typing import AnyStr
from ..decorators import substitute_in_graph
__all__ = ["fspath"]
# Copied from os.py in the standard library
@substitute_in_graph(os.fspath, can_constant_fold_through=True)
def fspath(path: AnyStr | os.PathLike[AnyStr]) -> AnyStr:
if isinstance(path, (str, bytes)):
return path
path_type = type(path)
try:
path_repr = path_type.__fspath__(path) # type: ignore[arg-type]
except AttributeError:
if hasattr(path_type, "__fspath__"):
raise
raise TypeError(
f"expected str, bytes or os.PathLike object, not {path_type.__name__}",
) from None
if isinstance(path_repr, (str, bytes)):
return path_repr # type: ignore[return-value]
raise TypeError(
f"expected {path_type.__name__}.__fspath__() to return str or bytes, "
f"not {type(path_repr).__name__}",
)
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