在Python中，将文件中的行作为带有两个单元格的移位寄存器读取

Question

我需要读取一个文件的行，以这样的方式，将表现为一个移位寄存器与两个单元。 例如：

with open("filename", 'r') as file:

 --first iteration--
 present = line1
 next  = line2
    do something

 --second iteration--
 present = line2
 next = line3
   do something

 --third iteration--
 present = line3
 next = line 4
    do someting

 and so on....

它可以用open(file, 'r')来完成，但不能保证文件会在脚本停止时关闭 由于在最后一次迭代之前“做点什么”的原因。你知道吗

有什么优雅的方法吗？你知道吗

Answer 1

当然可以：

with open("filename", 'r') as file:
    current_line = next(file)  # Get 1st line, advance iterator to 2nd line
    for next_line in file:
        do_something(current_line, next_line)
        current_line = next_line