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| -rw-r--r-- | Doc/library/functions.rst | 26 |
1 files changed, 15 insertions, 11 deletions
diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst index 5400feb355..4e4c49ce3a 100644 --- a/Doc/library/functions.rst +++ b/Doc/library/functions.rst @@ -868,17 +868,21 @@ are always available. They are listed here in alphabetical order. For floating point numbers, this truncates towards zero. If *x* is not a number or if *base* is given, then *x* must be a string, - :class:`bytes`, or :class:`bytearray` instance representing an :ref:`integer - literal <integers>` in radix *base*. Optionally, the literal can be - preceded by ``+`` or ``-`` (with no space in between) and surrounded by - whitespace. A base-n literal consists of the digits 0 to n-1, with ``a`` - to ``z`` (or ``A`` to ``Z``) having - values 10 to 35. The default *base* is 10. The allowed values are 0 and 2--36. - Base-2, -8, and -16 literals can be optionally prefixed with ``0b``/``0B``, - ``0o``/``0O``, or ``0x``/``0X``, as with integer literals in code. Base 0 - means to interpret exactly as a code literal, so that the actual base is 2, - 8, 10, or 16, and so that ``int('010', 0)`` is not legal, while - ``int('010')`` is, as well as ``int('010', 8)``. + :class:`bytes`, or :class:`bytearray` instance representing an integer + in radix *base*. Optionally, the string can be preceded by ``+`` or ``-`` + (with no space in between), have leading zeros, be surrounded by whitespace, + and have single underscores interspersed between digits. + + A base-n integer string contains digits, each representing a value from 0 to + n-1. The values 0--9 can be represented by any Unicode decimal digit. The + values 10--35 can be represented by ``a`` to ``z`` (or ``A`` to ``Z``). The + default *base* is 10. The allowed bases are 0 and 2--36. Base-2, -8, and -16 + strings can be optionally prefixed with ``0b``/``0B``, ``0o``/``0O``, or + ``0x``/``0X``, as with integer literals in code. For base 0, the string is + interpreted in a similar way to an :ref:`integer literal in code <integers>`, + in that the actual base is 2, 8, 10, or 16 as determined by the prefix. Base + 0 also disallows leading zeros: ``int('010', 0)`` is not legal, while + ``int('010')`` and ``int('010', 8)`` are. The integer type is described in :ref:`typesnumeric`. |