第 0004 题：任一个英文的纯文本文件，统计其中的单词出现的个数。

import os


os.chdir('C:/workspace')

def count_words(inputname):    
    fh=open(inputname)    
    read_fh=fh.read()
    number=1
    is_alpha=[]
    dict_words={}
    
    for word in read_fh:
        if word.isalpha():
            is_alpha.append(word)
        elif word=='\t' or word=='\n' or word==' ':
            is_alpha.append(word)            
    fh_alpha=''.join(is_alpha)
    fh_words=fh_alpha.split()
    for words in fh_words:
        words=words.lower()
        if words not in dict_words:
            dict_words[words]=number
        else:
            dict_words[words]=dict_words[words]+1
            
        
    print dict_words
    
count_words("words.txt")