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"""
A shim of the os module containing only simple path-related utilities
"""
try:
from os import *
except ImportError:
import abc, sys
def __getattr__(name):
if name in {"_path_normpath", "__path__"}:
raise AttributeError(name)
if name.isupper():
return 0
def dummy(*args, **kwargs):
import io
return io.UnsupportedOperation(f"{name}: no os specific module found")
dummy.__name__ = f"dummy_{name}"
return dummy
sys.modules['os'] = sys.modules['posix'] = sys.modules[__name__]
import posixpath as path
sys.modules['os.path'] = path
del sys
sep = path.sep
supports_dir_fd = set()
supports_effective_ids = set()
supports_fd = set()
supports_follow_symlinks = set()
def fspath(path):
"""Return the path representation of a path-like object.
If str or bytes is passed in, it is returned unchanged. Otherwise the
os.PathLike interface is used to get the path representation. If the
path representation is not str or bytes, TypeError is raised. If the
provided path is not str, bytes, or os.PathLike, TypeError is raised.
"""
if isinstance(path, (str, bytes)):
return path
# Work from the object's type to match method resolution of other magic
# methods.
path_type = type(path)
try:
path_repr = path_type.__fspath__(path)
except AttributeError:
if hasattr(path_type, '__fspath__'):
raise
else:
raise TypeError("expected str, bytes or os.PathLike object, "
"not " + path_type.__name__)
if isinstance(path_repr, (str, bytes)):
return path_repr
else:
raise TypeError("expected {}.__fspath__() to return str or bytes, "
"not {}".format(path_type.__name__,
type(path_repr).__name__))
class PathLike(abc.ABC):
"""Abstract base class for implementing the file system path protocol."""
@abc.abstractmethod
def __fspath__(self):
"""Return the file system path representation of the object."""
raise NotImplementedError
@classmethod
def __subclasshook__(cls, subclass):
return hasattr(subclass, '__fspath__')