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gh-95994: Clarify escaped newlines. (#96066) 

* gh-95994: clarify escaped newlines.

* Rephrase ambiguous sentence.

Co-authored-by: C.A.M. Gerlach <CAM.Gerlach@Gerlach.CAM>

* Use `<newline>` in escape sequences table.

Co-authored-by: C.A.M. Gerlach <CAM.Gerlach@Gerlach.CAM>

Co-authored-by: C.A.M. Gerlach <CAM.Gerlach@Gerlach.CAM>
This commit is contained in:
Ezio Melotti 2022-08-26 21:05:01 +02:00 committed by GitHub
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Doc/reference/lexical_analysis.rst
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@ -552,7 +552,7 @@ Standard C. The recognized escape sequences are:
+-----------------+---------------------------------+-------+
| Escape Sequence | Meaning | Notes |
+=================+=================================+=======+
| ``\newline`` | Backslash and newline ignored | |
| ``\``\ <newline>| Backslash and newline ignored | \(1) |
+-----------------+---------------------------------+-------+
| ``\\`` | Backslash (``\``) | |
+-----------------+---------------------------------+-------+
@ -574,10 +574,10 @@ Standard C. The recognized escape sequences are:
+-----------------+---------------------------------+-------+
| ``\v`` | ASCII Vertical Tab (VT) | |
+-----------------+---------------------------------+-------+
| ``\ooo`` | Character with octal value | (1,3) |
| ``\ooo`` | Character with octal value | (2,4) |
| | *ooo* | |
+-----------------+---------------------------------+-------+
| ``\xhh`` | Character with hex value *hh* | (2,3) |
| ``\xhh`` | Character with hex value *hh* | (3,4) |
+-----------------+---------------------------------+-------+
Escape sequences only recognized in string literals are:
@ -585,19 +585,30 @@ Escape sequences only recognized in string literals are:
+-----------------+---------------------------------+-------+
| Escape Sequence | Meaning | Notes |
+=================+=================================+=======+
| ``\N{name}`` | Character named *name* in the | \(4) |
| ``\N{name}`` | Character named *name* in the | \(5) |
| | Unicode database | |
+-----------------+---------------------------------+-------+
| ``\uxxxx`` | Character with 16-bit hex value | \(5) |
| ``\uxxxx`` | Character with 16-bit hex value | \(6) |
| | *xxxx* | |
+-----------------+---------------------------------+-------+
| ``\Uxxxxxxxx`` | Character with 32-bit hex value | \(6) |
| ``\Uxxxxxxxx`` | Character with 32-bit hex value | \(7) |
| | *xxxxxxxx* | |
+-----------------+---------------------------------+-------+
Notes:
(1)
A backslash can be added at the end of a line to ignore the newline::
>>> 'This string will not include \
... backslashes or newline characters.'
'This string will not include backslashes or newline characters.'
The same result can be achieved using :ref:`triple-quoted strings <strings>`,
or parentheses and :ref:`string literal concatenation <string-concatenation>`.
(2)
As in Standard C, up to three octal digits are accepted.
.. versionchanged:: 3.11
@ -605,22 +616,22 @@ Notes:
In a future Python version they will be a :exc:`SyntaxWarning` and
eventually a :exc:`SyntaxError`.
(2)
(3)
Unlike in Standard C, exactly two hex digits are required.
(3)
(4)
In a bytes literal, hexadecimal and octal escapes denote the byte with the
given value. In a string literal, these escapes denote a Unicode character
with the given value.
(4)
(5)
.. versionchanged:: 3.3
Support for name aliases [#]_ has been added.
(5)
(6)
Exactly four hex digits are required.
(6)
(7)
Any Unicode character can be encoded this way. Exactly eight hex digits
are required.