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import os
from typing import Union, List
def get_files_by_ext(directory: str,
media_extensions: Union[str, List[str]]
)-> List[str]:
if isinstance(media_extensions, str):
media_extensions = [media_extensions]
relative_paths = []
for root, dirs, files in os.walk(directory):
for file in files:
if any(file.endswith(ext) for ext in media_extensions):
relative_path = os.path.relpath(os.path.join(root, file),
directory)
relative_paths.append(relative_path)
relative_paths = sorted(relative_paths)
return relative_paths |