比较两个文件，打印出与单词相匹配的行。

Question

我有两个文本文件，一个是这样的

dog
 cat
 fish

和另一个类似的文件

The cat ran
The fish swam
The parrot sang

我希望能够搜索第二个文本文件，并打印出包含第一个文本文件中的单词的行，例如，输出的结果将是

The cat ran
The fish swam

Answer 1

那像这样的东西呢。我们从第一个文件中提取关键词并存储起来，然后在阅读第二个文件时，我们在打印前参考它们。

# file1.txt
# dog
# cat
# fish

# file2.txt
# The cat ran
# The fish swam
# The parrot sang

# reading file1 and getting the keywords
with open("file1.txt") as f:
    key_words = set(f.read().splitlines())

# reading file2 and iterating over all read lines 
with open("file2.txt") as f:
    all_lines = f.read().splitlines()
    for line in all_lines:
        if any(kw in line for kw in key_words): # if any of the word in key words is in line print it
            print(line)