python统计文本字符串里面单词出现的频率“`python

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])
“`

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