Find whole word anagrams from word list.

anagrams.py

from argparse import ArgumentParser
from collections import defaultdict
from pathlib import Path


def build_parser():
    parser = ArgumentParser()

    parser.add_argument('wordlist_filename', type=Path)

    return parser


def load_wordlist(filename):
    with open(filename) as fd:
        data = fd.read().lower().splitlines()

    return set(data)


def main():
    args = build_parser().parse_args()

    wordlist = load_wordlist(args.wordlist_filename)
    anagram_table = defaultdict(set)

    for word in wordlist:
        anagram_table[''.join(sorted(word))].add(word)

    while True:
        line = input("Enter a word to find anagrams for: ").strip()
        key = ''.join(sorted(line.lower()))
        matches = anagram_table[key] - {line.lower()}
        if not matches:
            print("No matches!")
            continue
        for match in matches:
            print(match)


if __name__ == '__main__':
    main()