def _download_fragment(fragment):
    ctx_copy = ctx.copy()
    download_fragment(fragment, ctx_copy)
    return (fragment, fragment['frag_index'], ctx_copy.get('fragment_filename_sanitized'))
def _download_fragment(fragment):
    ctx_copy = ctx.copy()
    download_fragment(fragment, ctx_copy)
    return (fragment, fragment['frag_index'], ctx_copy.get('fragment_filename_sanitized'))