Question

我正在逐行处理文件。检查每一行，是否包含给定文本。然后，需要将下一行分配给变量

i_line = iter(file)
for i_line in file:
    if text in i_line:
         #Go to the next line
         line = next(i_line, None) #A problem
         break

如何增加迭代器i_line以指向文件的下一行？这两种结构对我都不起作用

next(i_line, None)
i_line.next()

Answer 1

只需next(f)。

像

这样的东西

>>> with open('testFile.txt', 'r') as f:
        for line in f:
            if 'cat' in line:
                final_string = next(f)

因此，对于

的输入文本文件

My Name is ABC.
I am a male.
My pet is a cat.
It's name is Ronald.
I hate rats.

上面的代码给出了

>>> final_string
"It's name is Ronald.\n"

Answer 2

使用line = file.next()代替line = next(i_line, None)。

Answer 3

以下是使用next()处理文件的方法。

with open(filename) as file:
    line = next(file, None)
    while line:
        print(line.strip())
        line=next(file, None)

使用for line in file迭代器和next将打印每隔一行：

with open(filename) as file:
    for line in file:
        print(line.strip())
        line = next(file,None)

Python 3，增加迭代器

3 个答案: