在哪里可以找到传递给 open() 函数的不同模式的定义
Where to find definitions of different modes passed into `open()` function
我正在尝试了解以不同模式打开文件；具体来说，我不明白下面代码中 'rU' 的功能。
csv.reader(open(filename, 'rU'), delimiter=',')
根据下面的文档，'U' 添加了对通用换行符的支持，因为这些字符因操作系统而异。
https://docs.python.org/2/library/functions.html#open
"In addition to the standard fopen() values mode may be 'U' or 'rU'. Python is usually built with universal newlines 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 '\n', the Macintosh convention '\r', or the Windows convention '\r\n'. All of these external representations are seen as '\n' by the Python program."
我正在尝试了解以不同模式打开文件；具体来说，我不明白下面代码中 'rU' 的功能。
csv.reader(open(filename, 'rU'), delimiter=',')
根据下面的文档，'U' 添加了对通用换行符的支持，因为这些字符因操作系统而异。
https://docs.python.org/2/library/functions.html#open
"In addition to the standard fopen() values mode may be 'U' or 'rU'. Python is usually built with universal newlines 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 '\n', the Macintosh convention '\r', or the Windows convention '\r\n'. All of these external representations are seen as '\n' by the Python program."