newline controls how universal newlines mode works (it only applies to text mode). It can be
None,'','\n','\r', and'\r\n'. It works as follows:[...]
- When writing output to the stream, if newline is
None, any'\n'characters written are translated to the system default line separator,os.linesep. If newline is''or'\n', no translation takes place. If newline is any of the other legal values, any'\n'characters written are translated to the given string.
open(..., 'w', newline='')
當newline='\n',read,write數據中的\r\n都不會轉化。