diff options
Diffstat (limited to 'Doc/lib')
| -rw-r--r-- | Doc/lib/libmath.tex | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/Doc/lib/libmath.tex b/Doc/lib/libmath.tex index 5f1d86f..dc917c6 100644 --- a/Doc/lib/libmath.tex +++ b/Doc/lib/libmath.tex @@ -146,13 +146,18 @@ The mathematical constant \emph{e}. \end{datadesc} \begin{notice} - Specific exceptions raised in assorted error cases (and even whether some + The \module{math} module consists mostly of thin wrappers around + the platform C math library functions. Behavior in exceptional cases is + loosely specified by the C standards, and Python inherits much of its + math-function error-reporting behavior from the platform C + implementation. As a result, + the specific exceptions raised in error cases (and even whether some arguments are considered to be exceptional at all) are not defined in any useful cross-platform or cross-release way. For example, whether \code{math.log(0)} returns \code{-Inf} or raises \exception{ValueError} or - \exception{OverflowError} is both platform- and release-dependent, and in - cases where \code{math.log(0)} raises an \exception{OverflowError}, - \code{math.log(0L)} often raises a \exception{ValueError}. + \exception{OverflowError} isn't defined, and in + cases where \code{math.log(0)} raises \exception{OverflowError}, + \code{math.log(0L)} may raise \exception{ValueError} instead. \end{notice} \begin{seealso} |