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56 lines
1.4 KiB
56 lines
1.4 KiB
import collections
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from abc import ABC, abstractmethod
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from cppy.cp_util import *
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# 定义观察者接口 ，在 Pyhon中并不是必须
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class Observer(ABC):
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@abstractmethod
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def update(self, word):
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pass
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# 定义具体观察者类，用于统计词频
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class WordFrequencyObserver(Observer):
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def __init__(self):
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self.word_count = collections.Counter()
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def update(self, word):
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self.word_count[word] += 1
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def get_top_n(self,n):
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return self.word_count.most_common(n)
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# 定义主题类
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class WordSubject:
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def __init__(self):
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self.observers = []
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def attach(self, observer):
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self.observers.append(observer)
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def notify(self, word):
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for observer in self.observers:
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observer.update(word)
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# 主函数
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def main(testfilepath, top_n = 10 ):
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stopwords = get_stopwords()
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subject = WordSubject()
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# 创建一个观察者并附加到主题
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observer = WordFrequencyObserver()
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subject.attach(observer)
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# 处理文件
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wordlist = re_split( read_file(testfilepath) )
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for word in wordlist:
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if word not in stopwords:
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subject.notify(word) # 触发
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# 打印最高的N个词频
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top_words = observer.get_top_n(top_n)
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print_word_freqs(top_words)
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if __name__ == "__main__":
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main( testfilepath ) |