[docs] [issue20423] io.StringIO newline param has wrong default

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

No, actual default is '\n'.

>>> io.StringIO('abc\r\ndef\nghi\rklm').readlines()
['abc\r\n', 'def\n', 'ghi\rklm']
>>> io.StringIO('abc\r\ndef\nghi\rklm', newline=None).readlines()
['abc\n', 'def\n', 'ghi\n', 'klm']
>>> io.StringIO('abc\r\ndef\nghi\rklm', newline='').readlines()
['abc\r\n', 'def\n', 'ghi\r', 'klm']
>>> io.StringIO('abc\r\ndef\nghi\rklm', newline='\n').readlines()
['abc\r\n', 'def\n', 'ghi\rklm']
>>> io.StringIO('abc\r\ndef\nghi\rklm', newline='\r').readlines()
['abc\r', '\r', 'def\r', 'ghi\r', 'klm']
>>> io.StringIO('abc\r\ndef\nghi\rklm', newline='\r\n').readlines()
['abc\r\r\n', 'def\r\n', 'ghi\rklm']

----------
keywords: +easy
nosy: +serhiy.storchaka
stage:  -> needs patch
versions: +Python 2.7

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<http://bugs.python.org/issue20423>
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