Python txt文件加入字典並查詢

dicFile = open('train_1.txt', 'r')#打開數據
print '開始裝載數據...'
txtDict = {}#建立字典
while True:
    line = dicFile.readline()
    if line == '':
        break
    index = line.find('\t')#以tab鍵爲分割
    key = line[:index]
    value = line[index:]
    txtDict[key] = value#加入字典
dicFile.close()
##查找字典
srcFile = open('train1.txt', 'r')#要匹配的key
destFile = open('match.txt', 'w')#符合字典的寫入裏面
while True:
    line = srcFile.readline()
    if line == '':
        break
    index = line.find(' ')
    key = line[:index]
    if txtDict.has_key(key):
        destFile.write(key)
        destFile.write(txtDict[key])
    else:
        badFile.write(key)
        badFile.write('\n')
print '全部完成！'
destFile.close()
srcFile.close()