Transliterate Hebrew letters to Greek letters

hebr_grek.py

import sys
import argparse


def main():
    hebr = 'אבגדהוזחטיכךלמםנןסעפףצץקרשת'
    grek = 'αβγδευζηθικκλμμννξοππϻϻϙρστ'
    hebr_grek = str.maketrans(hebr, grek)

    parser = argparse.ArgumentParser()
    parser.add_argument('-i', '--input', nargs='*', type=argparse.FileType('r'), default=sys.stdin, help='read from files instead of stdin')
    parser.add_argument('-o', '--output', type=argparse.FileType('w'), default=sys.stdout, help='write to file instead of stdout')
    args = parser.parse_args()

    for file in args.input:
        for line in file:
            normalized = ''.join(c for c in line if c.isascii() or c in hebr)
            args.output.write(normalized.translate(hebr_grek))

        if args.input is not sys.stdin:
            file.close()

    if args.output is not sys.stdout:
        args.output.close()


if __name__ == '__main__':
    main()