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Diffstat (limited to 'Doc/library/functions.rst')
| -rw-r--r-- | Doc/library/functions.rst | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/Doc/library/functions.rst b/Doc/library/functions.rst index a420974..4b1cbc6 100644 --- a/Doc/library/functions.rst +++ b/Doc/library/functions.rst @@ -964,11 +964,15 @@ are always available. They are listed here in alphabetical order. .. function:: round(x[, n]) Return the floating point value *x* rounded to *n* digits after the decimal - point. If *n* is omitted, it defaults to zero. Values are rounded to the + point. If *n* is omitted, it defaults to zero. Delegates to + ``x.__round__(n)``. + + For the built-in types supporting :func:`round`, values are rounded to the closest multiple of 10 to the power minus *n*; if two multiples are equally close, rounding is done toward the even choice (so, for example, both - ``round(0.5)`` and ``round(-0.5)`` are ``0``, and ``round(1.5)`` is - ``2``). Delegates to ``x.__round__(n)``. + ``round(0.5)`` and ``round(-0.5)`` are ``0``, and ``round(1.5)`` is ``2``). + The return value is an integer if called with one argument, otherwise of the + same type as *x*. .. function:: set([iterable]) |