Question

我有一个输入文件，上面有这样的句子：

I like apples
My mother is called Anna.

我将这些句子转移到列表中然后我想要删除长度为＆lt; 3。

我试过这个：

with open("fis.txt", "r", encoding="utf8") as f:
    lst = [w.lower() for w in f.readlines() if len(w) >= 3]
    print(lst)

但它给了我['i like apples', 'my mother is called anna.']

我希望获得['like apples', 'mother called anna.']

这里似乎有什么问题？

Answer 1

f.readlines()为您提供了一个列表，其中包含两个与文件的两行对应的项目。

你需要遍历这些行（不需要先将它们读入内存，迭代f将会这样做），拆分每一行，然后过滤这些单词。

with open("fis.txt", "r", encoding="utf8") as f:
    lst = [' '.join(w.lower() for w in line.split() if len(w) >= 3) for line in f]

Answer 2

尝试：

with open("fis.txt", "r", encoding="utf8") as f:
    print( [" ".join(j for j in w.split() if len(j) >= 3 ) for w in f.readlines() ] )

<强>输出：

['like apples', 'mother called Anna.']

Answer 3

它取整个句子而不是单个单词，尝试迭代w然后检查长度。