raw strings

[846909323]

BPO	11793
Nosy	@amauryfa, @bitdancer

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2011-04-07.09:36:46.930>
created_at = <Date 2011-04-07.08:48:34.297>
labels = ['build', 'invalid']
title = 'raw strings'
updated_at = <Date 2011-04-08.00:09:26.999>
user = 'https://bugs.python.org/846909323'

bugs.python.org fields:

activity = <Date 2011-04-08.00:09:26.999>
actor = 'r.david.murray'
assignee = 'none'
closed = True
closed_date = <Date 2011-04-07.09:36:46.930>
closer = 'amaury.forgeotdarc'
components = []
creation = <Date 2011-04-07.08:48:34.297>
creator = '846909323'
dependencies = []
files = []
hgrepos = []
issue_num = 11793
keywords = []
message_count = 5.0
messages = ['133199', '133201', '133203', '133210', '133278']
nosy_count = 3.0
nosy_names = ['amaury.forgeotdarc', 'r.david.murray', '846909323']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = None
status = 'closed'
superseder = None
type = 'compile error'
url = 'https://bugs.python.org/issue11793'
versions = ['Python 3.2']

[846909323]

>>> print(r'\')
      
SyntaxError: EOL while scanning string literal
>>> print(r'\'')
\'
>>>

[846909323]

I think it should be

    >>> print(r'\')
    \
    >>> print(r'\'')

SyntaxError: EOL while scanning string literal
>>>

[amauryfa]

This is by design and documented:
http://docs.python.org/reference/lexical_analysis.html

"""
String quotes can be escaped with a backslash, but the backslash remains in the string; for example, r"\"" is a valid string literal consisting of two characters: a backslash and a double quote; r"\" is not a valid string literal (even a raw string cannot end in an odd number of backslashes).
Specifically, a raw string cannot end in a single backslash (since the backslash would escape the following quote character). Note also that a single backslash followed by a newline is interpreted as those two characters as part of the string, not as a line continuation.
"""

[846909323]

Sorry for my poor english and thank you for the answer.
Since I'm a perler, I think this is counterintuitive.
(In perl:
print '\'; #print \
print '\''; #error
print "\""; #print "
print "\"; #error
)

[bitdancer]

To a pythonista, the perl behavior is counter-intuitive :)

That said, the behavior of r'\' *is* somewhat counter-intuitive. See bpo-1271 for a fairly thorough exploration of why it is the way it is.