Password generator from regular expression.

regexpassgen.py

# Dependencies: pip install exrex
# Run: python ./regexpassgen.py --output <filename> <regex>

import argparse
import exrex


if __name__=='__main__':
    parser = argparse.ArgumentParser()
    parser.add_argument('regex', type=str, help='Password generator regex.')
    parser.add_argument('-o', '--output', action='store', help='Output file.')
    args = parser.parse_args()
    
    passwords = exrex.generate(args.regex)

    try:
        f = open(args.output, 'w')
        try:
            for p in passwords:
                f.write(p)
                f.write('\n')
        finally:
            f.close()
    except IOError:
        pass