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Mention math.degrees() and math.radians()

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Other minor rewrites
This commit is contained in:
Andrew M. Kuchling 2002-05-24 21:08:58 +00:00
parent cacfc07d08
commit a2a206b917
1 changed files with 24 additions and 12 deletions
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36
Doc/whatsnew/whatsnew23.tex
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@ -293,14 +293,13 @@ coefficient that multiplies some other quantity. If the statement is
clearly a truth value.
Python's Booleans were not added for the sake of strict type-checking.
A very strict language such as Pascal
% XXX is Pascal the right example here?
would also prevent you performing arithmetic with Booleans, and would
require that the expression in an \keyword{if} statement always
evaluate to a Boolean. Python is not this strict, and it never will
be. (\pep{285} explicitly says this.) So you can still use any
expression in an \keyword{if}, even ones that evaluate to a list or
tuple or some random object, and the Boolean type is a subclass of the
A very strict language such as Pascal would also prevent you
performing arithmetic with Booleans, and would require that the
expression in an \keyword{if} statement always evaluate to a Boolean.
Python is not this strict, and it never will be. (\pep{285}
explicitly says so.) So you can still use any expression in an
\keyword{if}, even ones that evaluate to a list or tuple or some
random object, and the Boolean type is a subclass of the
\class{int} class, so arithmetic using a Boolean still works.
\begin{verbatim}
@ -382,14 +381,20 @@ allocating memory have been consolidated down into two APIs.
Memory allocated with one API must not be freed with the other API.
\begin{itemize}
\item To allocate and free an undistinguished chunk of memory, use
\cfunction{PyMem_Malloc()}, \cfunction{PyMem_Realloc()},
\cfunction{PyMem_Free()}, and the other \cfunction{PyMem_*}
functions.
\item To allocate and free an undistinguished chunk of memory using
Python's allocator, use
\cfunction{PyMem_Malloc()}, \cfunction{PyMem_Realloc()}, and
\cfunction{PyMem_Free()}.
\item In rare cases you may want to avoid using Python's allocator
in order to allocate a chunk of memory;
use \cfunction{PyObject_Malloc}, \cfunction{PyObject_Realloc},
and \cfunction{PyObject_Free}.
\item To allocate and free Python objects,
use \cfunction{PyObject_New()}, \cfunction{PyObject_NewVar()}, and
\cfunction{PyObject_Del()}.
\end{itemize}
Thanks to lots of work by Tim Peters, pymalloc in 2.3 also provides
@ -492,6 +497,13 @@ KeyError: pop(): dictionary is empty
>>>
\end{verbatim}
\item Two new functions in the \module{math} module,
\function{degrees(\var{rads})} and \function{radians(\var{degs})},
convert between radians and degrees. Other functions in the
\module{math} module such as
\function{math.sin()} and \function{math.cos()} have always required
input values measured in radians. (Contributed by Raymond Hettinger.)
\item Two new functions, \function{killpg()} and \function{mknod()},
were added to the \module{posix} module that underlies the \module{os}
module.