如何处理列表理解解决方案？

Question

我正在练习列表理解，但无法正确获得直觉。

例如，对于下面这段代码（它工作得很好，我已经把它写成This question的解决方案），我应该如何一步步进行，并将这个解决方案转化为列表推导式解决方案？有简短解释的答案会很好。

with open("example.txt","r") as first, open("output.txt","r") as second:

    for i,j in zip(first,second):
        first_list = i.split()
        second_list = j.split()
        for i,j in  zip(first_list, second_list):
            print i,j,

Answer 1

以下将生成元组列表中最内层的 i, j 值：

with open("example.txt","r") as first, open("output.txt","r") as second:
    result = [(word1, word2) for line1, line2 in zip(first, second) for word1, word2 in zip(line1.split(), line2.split())]

我已将您的变量名替换为不那么晦涩的变量名。

以上可以写成嵌套循环：

 for line1, line2 in zip(first, second):
     for word1, word2 in zip(line1.split(), line2.split():
         outputlist.append((word1, word2))

如果你需要一个平坦的压缩单词列表，那么你需要第三个循环：

with open("example.txt","r") as first, open("output.txt","r") as second:
    result = [word 
              for line1, line2 in zip(first, second)
              for combo in zip(line1.split(), line2.split())
              for word in combo]

Answer 2

通过列表理解，您可以获得预期值的列表：

with open("example.txt","r") as first, open("output.txt","r") as second:
    my_list=[(t,k) for i,j in zip(first,second) for t,k in zip(i.split(),j.split())]

然后，如果你想打印项目，你可以遍历 my_list 并打印它们。

for i,j in my_list:
    print i,j

如何处理列表理解解决方案？

How to approach for a list comprehension solution?

python

list-comprehension