wordle.py

#               12345
greenletters = "....."
yelloletters=[ ".....",
               ".....",
               ".....",
               "....." ]
greyletters = ""

f = {"a":7.8, "b":2, "c":4, "d":3.8, "e":11, "f":1.4, "g":3, "h":2.3, "i":8.6,
"j":0.21, "k":0.97, "l":5.3, "m":2.7, "n":7.2, "o":6.1, "p":2.8, "q":0.19, "r":7.3,
"s":8.7, "t":6.7, "u":3.3, "v":3.3, "w":0.91, "x":0.27, "y":1.6, "z":0.44}

yset = {c for c in ''.join(yelloletters) if c != '.'}
gset = {c for c in greyletters}

yforbid = [set() for x in range(5)]
for y in yelloletters:
    for i in xrange(len(y)):
        c = y[i]
        if c != '.':
            yforbid[i].add(c)

def validwords():
    words = open("wordle.txt", "r")

    for w in words:
        w = w.strip()
        foundyellow = set(yset)

        for i in xrange(len(w)):
            c = w[i]
            yfc = yforbid[i]
            gc = greenletters[i]

            if (c in gset) or (c in yfc) or (gc != '.' and gc != c):
                foundyellow.add(1)
                break

            foundyellow.discard(c)

        if len(foundyellow) > 0:
            continue

        yield w

fl = {}

totalchars = 0
for w in validwords():
    for i in xrange(len(w)):
        c = w[i]
        gc = greenletters[i]
        if c == gc:
            continue
        fl[c] = fl.get(c, 0) + 1
        totalchars += 1

for c, freq in fl.iteritems():
    f[c] = f[c] * 0.01 + 100 * float(freq) / totalchars

tscore = -1000
bestword = ""
fchars = set()

for w in validwords():
    fchars.clear()
    wscore = 0

    for i in xrange(len(w)):
        c = w[i]
        wscore = wscore + f[c]
        if c in fchars:
            wscore -= 100

        fchars.add(c)

    if wscore > tscore:
        tscore = wscore
        bestword = w

print(bestword)