On Tue, May 5, 2015 at 1:17 AM, Peter Otten <__pete...@web.de> wrote:
> OK, you convinced me. Then I tried:
>
>>>> with open("tmp.txt", "wb") as f: f.write("0\r\n3\r5\n7")
> ...
>>>> assert len(open("tmp.txt", "rb").read()) == 8
>>>> f = open("tmp.txt", "rU")
>>>> f.readline()
> '0\n'
>>>> f.newlines
>>>> f.tell()
> 3
>>>> f.newlines
> '\r\n'
>
> Hm, so tell() moves the file pointer? Is that sane?... wow. Okay! That's a bit weird. It's possible that something's being done with internal buffering (after all, it's horribly inefficient to *actually* read text one byte at a time, even if that's what's happening conceptually), and that tell() causes some checks to be done. But that really is rather strange. I'd be interested to know what happens if another process writes to a pipe "0\r", then sleeps while the readline() and tell() happen, and then writes a "\n" - what will that do to newlines? By the way, it's as well to clarify, with all these examples, what Python version you're using. There may be significant differences. ChrisA -- https://mail.python.org/mailman/listinfo/python-list
