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| -rw-r--r-- | Doc/library/stdtypes.rst | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst index 5f1b732..76921cd 100644 --- a/Doc/library/stdtypes.rst +++ b/Doc/library/stdtypes.rst @@ -217,14 +217,15 @@ Numeric Types --- :class:`int`, :class:`float`, :class:`complex` There are three distinct numeric types: :dfn:`integers`, :dfn:`floating point numbers`, and :dfn:`complex numbers`. In addition, Booleans are a subtype of integers. Integers have unlimited precision. Floating point -numbers are implemented using :ctype:`double` in C---all bets on their -precision are off unless you happen to know the machine you are working -with. Complex numbers have a real and imaginary part, which are each -implemented using :ctype:`double` in C. To extract these parts from a -complex number *z*, use ``z.real`` and ``z.imag``. (The standard library -includes additional numeric types, :mod:`fractions` that hold rationals, -and :mod:`decimal` that hold floating-point numbers with user-definable -precision.) +numbers are usually implemented using :ctype:`double` in C; information +about the precision and internal representation of floating point +numbers for the machine on which your program is running is available +in :data:`sys.float_info`. Complex numbers have a real and imaginary +part, which are each a floating point number. To extract these parts +from a complex number *z*, use ``z.real`` and ``z.imag``. (The standard +library includes additional numeric types, :mod:`fractions` that hold +rationals, and :mod:`decimal` that hold floating-point numbers with +user-definable precision.) .. index:: pair: numeric; literals |