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Python: when does newlines get set in universal newlines mode?

+2 votes
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I have a text file with Windows-style line terminators (rn) which I open in universal newlines mode (Python 2.7). I would expect the newlines attribute to be set after the first call to the readline() method, but apparently this is not the case:

>>> f=open('test_crlf', 'rU')
>>> f.newlines
>>> f.readline()
'foon'
>>> f.newlines
>>> f.readline()
'barn'
>>> f.newlines
'rn'

On the other hand, the newlines attribute gets set after the first call to readline() on a file with Unix-style line endings.

Is this a bug or a feature?

posted May 4, 2015 by Jai Prakash

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