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Handling vs newlines in python on Mac vs Windows

I m a little bit confused by something, and I m wondering if this is a python thing. I have a text file that uses Windows line endings (" "), but if I iterate through some of the lines in the file, store them in a list, and print out the string representation of the list to the console, it shows " " line endings. Am I missing something?

Answer 1

是的, 它是一个 python 事项; 默认情况下 < code> Open () 打开文本模式的文件, 其中行尾的翻译取决于您代码运行的平台。您可以在 < code> Open () 调用中设置 < code> newline= , 要求通过未修改的行尾通过。

Python 2 s 标准 Open () 函数不支持此选项, 只有以二进制模式打开才能防止翻译, 但是您可以通过使用 io. Open () 来使用 Python 3 行为。

http://docs.python.org/library/formations.html#open” rel=“noreferrer”>关于open 的文件:http://docs.python.org/library/forms.html#open>:




   newline  控制着通用新线模式如何运作(仅适用于文本模式)。
  
  [.]
  
  
  When reading input from the stream, if newline is None, universal newlines mode is enabled. Lines in the input can end in  
 ,  
 , or  
 , and these are translated into  
  before being returned to the caller. If it is   , universal newlines mode is enabled, but line endings are returned to the caller untranslated.

Answer 2

以二进制模式打开文件将会在 Windows 上的 Py2 中避免发生这种情况。但是, 在 Py3 (和 Py2.6+ 中, 如果您使用 io. Open 而不是内建文件) 中, 二进制模式与文本模式之间意味着定义明确且平台独立的事物, 并且不会影响通用的新行。相反, 您可以做到 :

file = open(filename,  r , newline=  )

新的线条不会正常化

Answer 3

您应该做的是以通用新线支持打开文件( Python 2.x ) 。这是使用“ U” 或“ rU” 模式完成的。任何类型的新线都会得到支持。以下文件载于 Python 手册< a href=' http://docs. python.org/library/works. html#open” rel = “ noreferrer” > http://docs. python.org/library/ offices.html#open :

In addition to the standard fopen() values mode may be U or rU . Python is usually built with universal newline support; supplying U opens the file as a text file, but lines may be terminated by any of the following: the Unix end-of-line convention , the Macintosh convention , or the Windows convention . All of these external representations are seen as by the Python program. If Python is built without universal newline support a mode with U is the same as normal text mode. Note that file objects so opened also have an attribute called newlines which has a value of None (if no newlines have yet been seen), , , , or a tuple containing all the newline types seen.

对 Python 3 来说,有一个可以打开控制新线行为的新线选项。查看文档, 似乎通用新线支持是默认的。

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