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From: Peter Otten <__peter__@web.de>
Newsgroups: comp.lang.python
Subject: Re: ignoring or replacing white lines in a diff
Date: Fri, 15 Jan 2016 11:20:37 +0100
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Xref: csiph.com comp.lang.python:101740

Adriaan Renting wrote:

> - print line, did remove the extra newlines, but didn't get rid of the
> blank lines.

You mean you found that

import fileinput
for line in fileinput.FileInput("test.xml", inplace=True):
    if line.strip():
        print line,

does not remove all blank lines? 

If the file contains lone carriage returns try "universal newlines" mode:

for line in fileinput.FileInput("test.xml", inplace=True, mode="U"):
    if line.strip():
        print line,