word salad

gistfile1.txt

#!/usr/bin/env python

import sys
import collections
import random


words_by_first = collections.defaultdict(list)

with open('/usr/share/dict/words') as words:
    for word in words.readlines():
        word = word.strip()
        words_by_first[word[0]].append(word)

first = True
out = ''
for c in sys.argv[1]:
    c = c.lower()
    if c == ' ':
        continue
    else:
        if c in words_by_first:
            w = random.choice(words_by_first[c.lower()])
            if first:
                out += w.capitalize()
                first = False
            else:
                out += w
        else:
            out += c
    out += ' '

print out