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import argparse
from typing import Optional
from typing import Sequence
def main(argv: Optional[Sequence[str]] = None) -> int:
parser = argparse.ArgumentParser()
parser.add_argument('filenames', nargs='*', help='Filenames to check')
args = parser.parse_args(argv)
retv = 0
for filename in args.filenames:
with open(filename, 'rb') as f_b:
bts = f_b.read(3)
if bts == b'\xef\xbb\xbf':
with open(filename, newline='', encoding='utf-8-sig') as f:
contents = f.read()
with open(filename, 'w', newline='', encoding='utf-8') as f:
f.write(contents)
print(f'{filename}: removed byte-order marker')
retv = 1
return retv
if __name__ == '__main__':
raise SystemExit(main())
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