Random password generator

pwdgen.py

#!/usr/bin/python3

# Learning python project.
# I bet there are better ways of doing things than this, but it works well, especially paired with a workflow in Alfred.

#   -c, --chars    Number of characters to use
#   -r, --range    Amount of passwords to generate

import sys
import getopt
import string
import secrets

# Settings
minchars = 12
default_no_of_chars = 15


# Setup
chars = default_no_of_chars
argv = sys.argv[1:]
specials = "!#$%&()*+-?=@[]^_|"
alphabet = string.ascii_letters + string.digits + specials


# Create a password with the given characters
def create_password(chars) -> str:
    chars = int(chars)
    if chars < minchars:
        print("Minimum character for passwords is set to " + str(minchars))
        chars = minchars

    while True:
        password = "".join(secrets.choice(alphabet) for i in range(chars))
        if (
            any(c.islower() for c in password)
            and any(c.isupper() for c in password)
            and sum(c.isdigit() for c in password) >= 3
        ):
            break

    return password


passwords = []


def get_opts() -> list:
    try:
        opts, args = getopt.getopt(argv, "c:r:", ["chars=", "range="])
        return opts
    except:
        print("Error in getopt.getopt()")


# Show password
def show_password() -> None:
    pwdrange = 1
    global passwords
    passed_options = get_opts()

    if passed_options:
        for opt, arg in passed_options:
            if opt in ["-r", "--range"]:
                pwdrange = arg

        for opt, arg in passed_options:
            if opt in ["-c", "--chars"]:
                chars = arg

    # No options passed, must set chars.
    else:
        chars = default_no_of_chars

    # Create password(s)
    for i in range(int(pwdrange)):
        password = create_password(chars)
        passwords.append(password)

    for i in passwords:
        print(i)
    
# Execute
show_password()