the "strings" command implemented in Python

strings.py

from mmap import mmap, PROT_READ
import re
import sys

def strings(fname, n=6):
    with open(fname, 'rb') as f, mmap(f.fileno(), 0, prot=PROT_READ) as m:
        for match in re.finditer(('([\w/]{%s}[\w/]*)' % n).encode(), m):
            yield match.group(0)
       
if __name__ == '__main__':
    for word in strings(sys.argv[1]):
        print(word)

Line 11, Column 25 '(sys.argv[1])'