Tiny script to generate secure passwords that are easy to type quickly on telephone keypads

telpwgen.py

#!/usr/bin/env python3
import secrets
import sys

letters = [
    'abc',
    'def',
    'ghi',
    'jkl',
    'mno',
    'pqrs',
    'tuv',
    'wxyz',
]

def main():
    try:
        leng = int(sys.argv[1])
    except Exception:
        leng = 12

    try:
        num = int(sys.argv[2])
    except Exception:
        num = 10

    assert leng >= 1

    for _ in range(num):
        # start with any letter
        pw = secrets.choice(''.join(letters))
        for _ in range(leng-1):
            last_char = pw[-1]
            # now only generate letters that are not on the same key as the last letter
            pw += secrets.choice(''.join(lg for lg in letters if last_char not in lg))
        print(pw)

if __name__ == "__main__":
    main()