Typoman word spell helper. Find all possible combinations.

Typoman_helper.py

import argparse
import re

#https://github.com/first20hours/google-10000-english/blob/master/google-10000-english.txt
dictionary = "google-10000-english.txt"

parser = argparse.ArgumentParser(description='Find all words with specific letters')
parser.add_argument('letters', metavar='L', type=str, nargs='+',
                    help='array of letters like \'A\' \'B\' \'C2\', the number after letter limit the occurrence')
args = parser.parse_args()


def main():
    array = {}
    for arg in args.letters:
        letter = re.search(r"([a-zA-Z])(\d*)", arg)
        if not letter or letter.group(1) in array.keys():
            print("Invalid argument: " + arg)
            exit(1)
        if letter.group(2):
            array[letter.group(1)] = int(letter.group(2))
        else:
            array[letter.group(1)] = -1
    with open(dictionary, "r") as f:
        lines = f.read().splitlines()
        for line in lines:
            checklist = array.copy()
            length = len(line)
            if length < 2:
                continue
            for i, c in enumerate(line):
                if c not in checklist.keys():
                    break
                else:
                    checklist[c] -= 1
                    if checklist[c] == -1:
                        break
                    if i == length - 1:
                        print(line)


if __name__ == "__main__":
    main()