Complete issue 3083: add alternate (#) formatting to bin, oct, hex in str.format().
diff --git a/Doc/library/string.rst b/Doc/library/string.rst
index be9bccb..0e345e3 100644
--- a/Doc/library/string.rst
+++ b/Doc/library/string.rst
@@ -321,7 +321,7 @@
The general form of a *standard format specifier* is:
.. productionlist:: sf
- format_spec: [[`fill`]`align`][`sign`][0][`width`][.`precision`][`type`]
+ format_spec: [[`fill`]`align`][`sign`][#][0][`width`][.`precision`][`type`]
fill: <a character other than '}'>
align: "<" | ">" | "=" | "^"
sign: "+" | "-" | " "
@@ -375,6 +375,10 @@
| | positive numbers, and a minus sign on negative numbers. |
+---------+----------------------------------------------------------+
+The ``'#'`` option is only valid for integers, and only for binary,
+octal, or decimal output. If present, it specifies that the output
+will be prefixed by ``'0b'``, ``'0o'``, or ``'0x'``, respectively.
+
*width* is a decimal integer defining the minimum field width. If not
specified, then the field width will be determined by the content.
@@ -395,7 +399,7 @@
+---------+----------------------------------------------------------+
| Type | Meaning |
+=========+==========================================================+
- | ``'b'`` | Binary. Outputs the number in base 2. |
+ | ``'b'`` | Binary format. Outputs the number in base 2. |
+---------+----------------------------------------------------------+
| ``'c'`` | Character. Converts the integer to the corresponding |
| | unicode character before printing. |