python 统计英文单词出现频率

# coding = utf-8

wordstring = '''I never saw a Moor-I never saw the Sea.
                Yet know I how the Heather looks.
                And what a Billow be.
                I never spoke with God.
                Nor visited in Heaven.
                Yet certain am I of the spot.
                As if the Checks were given.'''

wordstring = wordstring.replace('.', '')
wordlist = wordstring.split()
wordfreq = []
for w in wordlist:
    wordfreq.append(wordlist.count(w))

d = dict(zip(wordlist,wordfreq))
print(d)

{'I': 4, 'never': 3, 'saw': 2, 'a': 2, 'Moor-I': 1, 'the': 4, 'Sea': 1, 'Yet': 2, 'know': 1, 'how': 1, 'Heather': 1, 'looks': 1, 'And': 1, 'what': 1, 'Billow': 1, 'be': 1, 'spoke': 1, 'with': 1, 'God': 1, 'Nor': 1, 'visited': 1, 'in': 1, 'Heaven': 1, 'certain': 1, 'am': 1, 'of': 1, 'spot': 1, 'As': 1, 'if': 1, 'Checks': 1, 'were': 1, 'given': 1}