python统计文本字符串里面单词出现的频率，python字符串,python统计文本字符

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])```