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Reflect recent patch for float % and divmod() by Tim Peters. Content 

updates by Tim Peters, markup by FLD.
This commit is contained in:
Fred Drake 1999-05-06 14:46:35 +00:00
parent 9263e78ff2
commit 1ea7c75687
2 changed files with 16 additions and 5 deletions
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8
Doc/lib/libfuncs.tex
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@ -178,8 +178,12 @@ class instances are callable if they have a \method{__call__()} method.
operand types, the rules for binary arithmetic operators apply. For
plain and long integers, the result is the same as
\code{(\var{a} / \var{b}, \var{a} \%{} \var{b})}.
For floating point numbers the result is the same as
\code{(math.floor(\var{a} / \var{b}), \var{a} \%{} \var{b})}.
For floating point numbers the result is \code{(\var{q}, \var{a} \%{}
\var{b})}, where \var{q} is usually \code{math.floor(\var{a} /
\var{b})} but may be 1 less than that. In any case \code{\var{q} *
\var{b} + \var{a} \%{} \var{b}} is very close to \var{a}, if
\code{\var{a} \%{} \var{b}} is non-zero it has the same sign as
\var{b}, and \code{0 <= abs(\var{a} \%{} \var{b}) < abs(\var{b})}.
\end{funcdesc}
\begin{funcdesc}{eval}{expression\optional{, globals\optional{, locals}}}

13
Doc/ref/ref5.tex
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@ -583,9 +583,16 @@ The integer division and modulo operators are connected by the
following identity: \code{x == (x/y)*y + (x\%y)}. Integer division and
modulo are also connected with the built-in function \function{divmod()}:
\code{divmod(x, y) == (x/y, x\%y)}. These identities don't hold for
floating point and complex numbers; there a similar identity holds where
\code{x/y} is replaced by \code{floor(x/y)}) or
\code{floor((x/y).real)}, respectively.
floating point and complex numbers; there similar identities hold
approximately where \code{x/y} is replaced by \code{floor(x/y)}) or
\code{floor(x/y) - 1} (for floats),\footnote{
If x is very close to an exact integer multiple of y, it's
possible for \code{floor(x/y)} to be one larger than
\code{(x-x\%y)/y} due to rounding. In such cases, Python returns
the latter result, in order to preserve that \code{divmod(x,y)[0]
* y + x \%{} y} be very close to \code{x}.
} or \code{floor((x/y).real)} (for
complex).
The \code{+} (addition) operator yields the sum of its arguments.
The arguments must either both be numbers or both sequences of the