how to compute the tfidf in python

import sys, math, re
from operator import itemgetter
import math

#reading from test file
wF = open (r'C:\Craig\Data2\craiglist-file1.txt')
wordFile = wF.read()
wordList = wordFile.upper()
wordList = wordFile.split()

#Reading from the keyword file
kWF = open('keywords.txt','r')
keywordFile = kWF.read()
KeywordList = keywordFile.upper()
keywordList = keywordFile.split()

word = 'k'
document = 'wordlist'
wordlist = 'w'


#total number of times terms occurs in file
def countTerm(word, document):
        return
for k in keywordList:
    countTerm = 0
    for w in wordList:
        if k == w:
            countTerm = countTerm + 1
        if k == "the":
           print k, w, countTerm
    print k, countTerm


#total number of word in document
def wordfreq(wordList):
    return
wordfreq = [wordList.count(p) for p in wordList]
dictionary = dict(zip(wordList, wordfreq))
count2 = 0
for t in wordList:
    count2+=1
print 'total number of words', count2


#total number of file being processed
def docfreq(k, wF):
    count = 0
    for wordList in wF:
        if countTerm(k, w) > 0:
            count += 1
      
    return count
print countTerm
#docfreq = [wordList.count(z) for z in wF]
#dictionary = dict(zip(wF, docfreq))
#count3 = 1
#for j in wF:
    #count3 +=1
#print 'total number of document', count3

for n in range(0,len(keywordList)):
    print keywordList[n] wordfreq[n]/count2




# term frequency
# total number of times terms occurs in file / total number of word in document

#inverse document frequency