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Add note about platform-specific behavior arising from discussion on bug 

711019.
This commit is contained in:
Skip Montanaro 2003-04-26 02:59:00 +00:00
parent 8b7beb631b
commit 5118341530
1 changed files with 11 additions and 1 deletions
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Doc/lib/libmath.tex
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@ -17,7 +17,7 @@ complex result allows earlier detection of the unexpected complex
number used as a parameter, so that the programmer can determine how
and why it was generated in the first place.
The following functions provided by this module:
The following functions are provided by this module:
\begin{funcdesc}{acos}{x}
Return the arc cosine of \var{x}.
@ -145,6 +145,16 @@ The mathematical constant \emph{pi}.
The mathematical constant \emph{e}.
\end{datadesc}
\begin{notice}
Specific exceptions raised in assorted 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}.
\end{notice}
\begin{seealso}
\seemodule{cmath}{Complex number versions of many of these functions.}
\end{seealso}