diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst --- a/Doc/library/functions.rst +++ b/Doc/library/functions.rst @@ -623,20 +623,26 @@ Consider using the :func:`raw_input` function for general input from users. -.. function:: int([x[, base]]) +.. function:: int(x=0) + int(x, base=10) - Convert a string or number to a plain integer. If the argument is a string, - it must contain a possibly signed decimal number representable as a Python - integer, possibly embedded in whitespace. The *base* parameter gives the - base for the conversion (which is 10 by default) and may be any integer in - the range [2, 36], or zero. If *base* is zero, the proper radix is - determined based on the contents of string; the interpretation is the same as - for integer literals. (See :ref:`numbers`.) If *base* is specified and *x* - is not a string, :exc:`TypeError` is raised. Otherwise, the argument may be a - plain or long integer or a floating point number. Conversion of floating - point numbers to integers truncates (towards zero). If the argument is - outside the integer range a long object will be returned instead. If no - arguments are given, returns ``0``. + Convert a number or string *x* to an integer, or return ``0`` if no + arguments are given. If *x* is a number, it can be a plain integer, a long + integer, or a floating point number. If *x* is floating point, the conversion + truncates towards zero. If the argument is outside the integer range, the + function returns a long object instead. + + If *x* is not a number or if *base* is given, then *x* must be a string or + Unicode object representing an :ref:`integer literal ` 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``/``0``, or ``0x``/``0X``, as with integer literals in code. + Base 0 means to interpret the string exactly as an integer literal, so that + the actual base is 2, 8, 10, or 16. The integer type is described in :ref:`typesnumeric`.