Generate a list of usernames making different combinations from Name + Lastname.

gen_usernames.py

#!/usr/bin/env python
import sys
import os.path
import argparse

def generate_usernames(fname, lname, domain):
    usernames = [
        f"{fname}{lname}@{domain}",           # johndoe@domain.com
        f"{lname}{fname}@{domain}",           # doejohn@domain.com
        f"{fname}.{lname}@{domain}",          # john.doe@domain.com
        f"{lname}.{fname}@{domain}",          # doe.john@domain.com
        f"{lname}{fname[0]}@{domain}",        # doej@domain.com
        f"{fname[0]}{lname}@{domain}",        # jdoe@domain.com
        f"{lname[0]}{fname}@{domain}",        # djoe@domain.com
        f"{fname[0]}.{lname}@{domain}",       # j.doe@domain.com
        f"{lname[0]}.{fname}@{domain}",       # d.john@domain.com
        f"{fname}@{domain}",                  # john@domain.com
        f"{lname}@{domain}"                   # doe@domain.com
    ]
    return usernames

def main():
    script_name = os.path.basename(sys.argv[0])
    parser = argparse.ArgumentParser(
        description="Generate usernames from a list of names.",
        epilog=f"Example: python {script_name} -f names.txt -d domain.com -o output.txt"
    )
    parser.add_argument('-f', '--file', required=True, help="Path to the names file.")
    parser.add_argument('-d', '--domain', required=True, help="Domain to append to usernames.")
    parser.add_argument('-o', '--output', help="File to save the generated usernames.")
    
    args = parser.parse_args()
    names_file = args.file
    domain = args.domain
    output_file = args.output

    if not os.path.exists(names_file): 
        print("{} not found".format(names_file))
        sys.exit(0)

    formats = [
        "First name + Last name",
        "Last name + First name",
        "First name + '.' + Last name",
        "Last name + '.' + First name",
        "Last name + First initial",
        "First initial + Last name",
        "Last initial + First name",
        "First initial + '.' + Last name",
        "Last initial + '.' + First name",
        "First name",
        "Last name"
    ]

    example_names = generate_usernames("john", "doe", domain)
    max_format_length = max(len(fmt) for fmt in formats)
    print("Select the format for the username:")
    for i, (fmt, example) in enumerate(zip(formats, example_names), 1):
        print(f"{i}: {fmt:<{max_format_length}} ({example})")

    choice = int(input("Enter the number of your choice: "))

    if choice < 1 or choice > len(formats):
        print("Invalid choice")
        sys.exit(0)

    format_index = choice - 1

    generated_usernames = []
    with open(names_file) as file:
        for line in file:
            name = ''.join([c for c in line if c == " " or c.isalpha()])
            tokens = name.lower().split()

            # skip empty lines
            if len(tokens) < 1:
                continue

            fname = tokens[0]
            lname = tokens[-1]

            usernames = generate_usernames(fname, lname, domain)
            generated_usernames.append(usernames[format_index])
            print(usernames[format_index])

    if output_file:
        with open(output_file, 'w') as f:
            for username in generated_usernames:
                f.write(username + '\n')
        print(f"[i] Usernames have been saved to {output_file}")

if __name__ == "__main__":
    main()