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Issue #15096: Drop support for the ur string prefix

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Christian Heimes 2012-06-20 11:17:58 +02:00
parent 10c8791978
commit 0b3847de6d
6 changed files with 28 additions and 37 deletions
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14
Doc/reference/lexical_analysis.rst
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@ -401,7 +401,7 @@ String literals are described by the following lexical definitions:
.. productionlist::
stringliteral: [`stringprefix`](`shortstring` | `longstring`)
stringprefix: "r" | "u" | "ur" | "R" | "U" | "UR" | "Ur" | "uR"
stringprefix: "r" | "u" | "R" | "U"
shortstring: "'" `shortstringitem`* "'" | '"' `shortstringitem`* '"'
longstring: "'''" `longstringitem`* "'''" | '"""' `longstringitem`* '"""'
shortstringitem: `shortstringchar` | `stringescapeseq`
@ -444,19 +444,21 @@ must be expressed with escapes.
As of Python 3.3 it is possible again to prefix unicode strings with a
``u`` prefix to simplify maintenance of dual 2.x and 3.x codebases.
Both string and bytes literals may optionally be prefixed with a letter ``'r'``
Bytes literals may optionally be prefixed with a letter ``'r'``
or ``'R'``; such strings are called :dfn:`raw strings` and treat backslashes as
literal characters. As a result, in string literals, ``'\U'`` and ``'\u'``
escapes in raw strings are not treated specially.
escapes in raw strings are not treated specially. Given that Python 2.x's raw
unicode literals behave differently than Python 3.x's the ``'ur'`` syntax
is not supported.
.. versionadded:: 3.3
The ``'rb'`` prefix of raw bytes literals has been added as a synonym
of ``'br'``.
.. versionadded:: 3.3
Support for the unicode legacy literal (``u'value'``) and other
versions were reintroduced to simplify the maintenance of dual
Python 2.x and 3.x codebases. See :pep:`414` for more information.
Support for the unicode legacy literal (``u'value'``) was reintroduced
to simplify the maintenance of dual Python 2.x and 3.x codebases.
See :pep:`414` for more information.
In triple-quoted strings, unescaped newlines and quotes are allowed (and are
retained), except that three unescaped quotes in a row terminate the string. (A