问题描述
我碰到了这种语法，用于读取文件中的行.
I came across this syntax for reading the lines in a file.
with open(...) as f:
for line in f:
<do something with line>
说我希望<do something with line>行将每行追加到列表中.有什么方法可以使用with关键字在列表理解中完成此任务吗?或者，至少有某种方法可以在一条语句中完成我想要的事情?
Say I wanted the <do something with line> line to append each line to a list. Is there any way to accomplish this, using the with keyword, in a list comprehension? Or, is there at least some way of doing what I want in a single statement?
推荐答案
您可以编写类似
with open(...) as f:
l = [int(line) for line in f]
但是您不能将with放入列表理解中.
but you can't put the with into the list comprehension.
也许可以写类似的东西
l = [int(line) for line in open(...).read().split("\n")]
，但是您稍后需要手动调用f.close()，这种方式不会给您变量f.超出范围时，可能会自动关闭filhandle，但我不会依赖它.
but you would need to call f.close() later manually and this way gives you no variable f. It might happen that the filhandle is closed automatically when going out of scope, but I would not rely on it.
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