Python:使用另一个文件作为键从文件中提取行

Question

我有一个看起来像这样的“ key ”文件 (MyKeyFile):

afdasdfa ghjdfghd wrtwertwt asdf(这些在专栏中，但我从来没有弄清楚格式，抱歉)

我调用这些键，它们与我想从“源”文件中提取的行的第一个词相同。所以源文件 (MySourceFile) 看起来像这样(同样，格式错误，但第一列 = 键，后面的列 = 数据):

afdasdfa(几个制表符分隔的列)..ghjdfghd(几个制表符分隔的列).wrtwwtwt..阿斯达夫

还有'.'将指示当前不感兴趣的线路。

我是 Python 的绝对新手，这就是我的成就:

with open('MyKeyFile','r') as infile, \
open('MyOutFile','w') as outfile:
    for line in infile:
        for runner in source:
            # pick up the first word of the line in source
            # if match, print the entire line to MyOutFile
            # here I need help
outfile.close()

我意识到可能有更好的方法来做到这一点。感谢所有反馈 - 沿着我解决它的方式，或者沿着更复杂的方式。

谢谢jd

Answer 1

我认为这将是一种更简洁的方法，假设您的“ key ”文件名为“key_file.txt”并且您的主文件名为“main_file.txt”

keys = []
my_file = open("key_file.txt","r") #r is for reading files, w is for writing to them.
for line in my_file.readlines():
    keys.append(str(line)) #str() is not necessary, but it can't hurt
#now you have a list of strings called keys. 
#take each line from the main text file and check to see if it contains any portion of a given key. 

my_file.close()
new_file = open("main_file.txt","r")
for line in new_file.readlines():
    for key in keys:
        if line.find(key) > -1: 
            print "I FOUND A LINE THAT CONTAINS THE TEXT OF SOME KEY", line

您可以修改打印功能或摆脱它，以使用包含某些键文本的所需行来执行您想要的操作。让我知道这是否有效