获取文件中的下一行

问题描述

我正在阅读一个文件，想知道是否有办法读取for循环中的下一行？

我正在读取这样的文件：

  file = open（input，r）。read（）
 for file.splitlines（） 
 line = doSomething（）
  

所以无论如何我都可以检索下一行文件中的for循环，使我可以在 doSomething（）函数中执行一些操作？

解决方案

只要循环打开文件即可：

  infile = open（input，r）
在infile中的行：
 line = doSomething（line，next（infile））
  / pre> 
 
 
因为您现在使用该文件作为迭代器，所以您可以调用   随时可以检索一个额外的行。
 
 
 
另外两个提示： 
 
 
 
 
 
不要调用变量文件;它掩盖了python中内置的文件类型对象。我将它命名为 infile 。
     code>与语句。它会在完成时自动关闭文件：
 与开放（输入，r）作为infile：
为infile行：
 line = doSomething（line，next（infile））
  
  
 
 
I am reading in a file and wonder if there's a way to read the next line in a for loop?
I am currently reading the file like this:
file = open(input,"r").read()
for line in file.splitlines():
  line = doSomething()
So is there anyway I can retrieve the next line of the file in that for loop such that I can perform some operation in the doSomething() function?
Thanks
 解决方案 
Just loop over the open file:
infile = open(input,"r")
for line in infile:
    line = doSomething(line, next(infile))
Because you now use the file as an iterator, you can call the next() function on the infile variable at any time to retrieve an extra line.
Two extra tips:
Don't call your variable file; it masks the built-in file type object in python. I named it infile instead.
You can use the open file as a context manager with the with statement. It'll close the file for you automatically when done:
with open(input,"r") as infile:
    for line in infile:
        line = doSomething(line, next(infile))
                        
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