A script to find the least used keys on a keyboard from a key distribution file

check-freq

#!/usr/bin/env python3
from os.path import expanduser
from argparse import ArgumentParser
import json


def main():
    parser = ArgumentParser(description='Script to find least used key on keyboard')
    parser.add_argument('action', default='sort', nargs='?', choices=['sort', 'extra'])
    parser.add_argument('-f', '--key-dist-file', default='~/.kefrey.json', help='Key distribution json file')
    args = parser.parse_args()
    
    with open(expanduser(args.key_dist_file)) as f:
        freq = json.load(f)
    
    symbol_to_name = {
        '-': 'minus',
        '=': 'equal',
        '[': 'bracketleft',
        ']': 'bracketright',
        ';': 'semicolon',
        "'": 'apostrophe',
        ',': 'comma',
        '.': 'period',
        '!': 'exclam',
        '@': 'at',
        '#': 'numbersign', 
        '$': 'dollar',
        '%': 'percent',
        '^': 'asciicircum',
        '&': 'ampersand',
        '*': 'asterisk',
        '(': 'parenleft',
        ')': 'parenright',
        '_': 'underscore',
        '+': 'plus',
        '{': 'braceleft',
        '}': 'braceright',
        ':': 'color',
        '"': 'quotedbl',
        '<': 'less',
        '>': 'greater',
        '?': 'question',
    }
    
    keys = [
        ('1234567890-=', '!@#$%^&*()_+'),
        ('qwertyuiop[]', 'QWERTYUIOP{}'),
        ('asdfghjkl;\'', 'ASDFGHJKL:"'),
        ('zxcvbnm,./', 'ZXCVBNM<>?')
    ]

    possibles = []
    for key_names, alt_names in keys:
        for c, a in zip(key_names, alt_names):
            if c in symbol_to_name:
                c = symbol_to_name[c]
            if a in symbol_to_name:
                a = symbol_to_name[a]
            possibles.append((freq.pop(c, 0) + freq.pop(a, 0), c))
    possibles.sort(reverse=True)

    if args.action == 'sort':
        for amount, name in possibles:
            print(name, '-', amount)
    elif args.action == 'extra':
        for name, amount in sorted(list(freq.items()), key=lambda x: x[-1]):
            print(name, '-', amount)


if __name__ == '__main__':
    main()