En Wed, 16 Dec 2009 11:09:32 -0300, Ed Keith <e_...@yahoo.com> escribió:
I am having a problem when substituting a raw string. When I do the
following:
re.sub('abc', r'a\nb\nc', '123abcdefg')
I get
"""
123a
b
cdefg
"""
what I want is
r'123a\nb\ncdefg'
On 12/16/2009 9:35 AM, Gabriel Genellina wrote:
From http://docs.python.org/library/re.html#re.sub
re.sub(pattern, repl, string[, count])
...repl can be a string or a function; if
it is a string, any backslash escapes in
it are processed. That is, \n is converted
to a single newline character, \r is
converted to a linefeed, and so forth.
So you'll have to double your backslashes:
I'm not persuaded that the docs are clear. Consider:
>>> 'ab\\ncd' == r'ab\ncd'
True
Naturally enough. So I think the right answer is:
1. this is a documentation bug (i.e., the documentation
fails to specify unexpected behavior for raw strings), or
2. this is a bug (i.e., raw strings are not handled correctly
when used as replacements)
I vote for 2.
Peter's use of a function highlights just how odd this is:
getting the raw string via a function produces a different
result than providing it directly. If this is really the
way things ought to be, I'd appreciate a clear explanation
of why.
Alan Isaac
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