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import os.path

from typing import NamedTuple

from typing import Tuple

class Prefix(NamedTuple):

prefix_dir: str

def path(self, *parts: str) -> str:

return os.path.normpath(os.path.join(self.prefix_dir, *parts))

def exists(self, *parts: str) -> bool:

return os.path.exists(self.path(*parts))

def star(self, end: str) -> Tuple[str, ...]:

paths = os.listdir(self.prefix_dir)

return tuple(path for path in paths if path.endswith(end))