hand stats for keyboard layouts

fingerstats.py

# code for determining how much of a word is typed with different hands in a given keyboard layout
# for the corncob list (http://www.mieliestronk.com/corncob_lowercase.txt), i got:
# >>> fingerstats.wordsfile('corncob.txt', fingerstats.qwerty)
# the left hand typed   59.29% of the letters
# the right hand typed  40.71%
# 
# >>> fingerstats.wordsfile('corncob.txt', fingerstats.colemak)
# the left hand typed   50.56% of the letters
# the right hand typed  49.44%
# 
# >>> fingerstats.wordsfile('corncob.txt', fingerstats.dvorak)
# the left hand typed   43.38% of the letters
# the right hand typed  56.62%

from collections import namedtuple

Hands = namedtuple('Hands', ['left', 'right'])

qwerty  = Hands('qwertasdfgzxcvb', 'yuiophjklnm')
colemak = Hands('qwfpgarstdzxcvb', 'jluyhneiokm')
dvorak  = Hands('pyaoeuiqjkx', 'fgcrldhtnsbmwvz')

def percent(num):
    return '{: .2%}'.format(num)

def ratio(word, layout: Hands=qwerty) -> Hands:
    """
    portion of letters in word belonging to left and right, respectivly
    """
    lefts = 0
    rights = 0
    total = 0
    for letter in word:
        letter = letter.lower()
        if letter in layout.left:
            lefts += 1
            total += 1
        elif letter in layout.right:
            rights += 1
            total += 1

    return Hands(lefts / total, rights / total)

def wordslist(words, layout: Hands=qwerty):
        lefts = 0
        rights = 0
        count = 0
        for word in words:
            word = word.strip()
            rat = ratio(word, layout)
            lefts += rat.left
            rights += rat.right
            count += 1

        return Hands(lefts / count, rights / count)

def wordsfile(fname, layout: Hands=qwerty):
    with open(fname, 'r') as f:
        ret = wordslist(f, layout)
        print(f'the left hand typed  {percent(ret.left)} of the letters')
        print(f'the right hand typed {percent(ret.right)}')