如果它只是提取和檢索三元組，你應(yīng)該嘗試使用NLTK：

>>> import nltk

>>> sent = "this is a foo bar crazycoder"

>>> trigrams = nltk.ngrams(sent.split(), 3)

[('this', 'is', 'a'), ('is', 'a', 'foo'), ('a', 'foo', 'bar'), ('foo', 'bar', 'crazycoder')]

# token "a" in first element of trigram

>>> first_a = [i for i in trigrams if i[0] == "a"]

[('a', 'foo', 'bar')]

# token "a" in 2nd element of trigram

>>> second_a = [i for i in trigrams if i[1] == "a"]

[('is', 'a', 'foo')]

# token "a" in third element of trigram

>>> third = [i for i in trigrams if i[2] == "a"]

[('this', 'is', 'a')]

# look for 2gram in trigrams

>> two_foobar = [i for i in trigrams if "foo" in i and "bar" in i]

[('a', 'foo', 'bar'), ('foo', 'bar', 'crazycoder')]

# look for a perfect 3gram

>> perfect = [i fof i in trigrams if "foo bar crazycoder".split() == i]

[('foo', 'bar', 'crazycoder')]

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