python统计文本字符串里单词出现频率的方法_Python

本文实例讲述了python 统计文本字符串里单词出现频率的方法。分享给大家供大家参考。具体实现方法如下：

									# word frequency in a text

									# tested with Python24  vegaseat  25aug2005

									# Chinese wisdom ...

									str1 = """Man who run in front of car, get tired.

									Man who run behind car, get exhausted."""

									print "Original string:"

									print str1

									print

									# create a list of words separated at whitespaces

									wordList1 = str1.split(None)

									# strip any punctuation marks and build modified word list

									# start with an empty list

									wordList2 = []

									for word1 in wordList1:

									  # last character of each word

									  lastchar = word1[-1:]

									  # use a list of punctuation marks

									  if lastchar in [",", ".", "!", "?", ";"]:

									    word2 = word1.rstrip(lastchar)

									  else:

									    word2 = word1

									  # build a wordList of lower case modified words

									  wordList2.append(word2.lower())

									print "Word list created from modified string:"

									print wordList2

									print

									# create a wordfrequency dictionary

									# start with an empty dictionary

									freqD2 = {}

									for word2 in wordList2:

									  freqD2[word2] = freqD2.get(word2, 0) + 1

									# create a list of keys and sort the list

									# all words are lower case already

									keyList = freqD2.keys()

									keyList.sort()

									print "Frequency of each word in the word list (sorted):"

									for key2 in keyList:

									 print "%-10s %d" % (key2, freqD2[key2])

希望本文所述对大家的Python程序设计有所帮助。

python统计文本字符串里单词出现频率的方法

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