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Diffstat (limited to 'Doc/whatsnew/whatsnew23.tex')
| -rw-r--r-- | Doc/whatsnew/whatsnew23.tex | 36 |
1 files changed, 24 insertions, 12 deletions
diff --git a/Doc/whatsnew/whatsnew23.tex b/Doc/whatsnew/whatsnew23.tex index 8ff32e4..cb5d6fd 100644 --- a/Doc/whatsnew/whatsnew23.tex +++ b/Doc/whatsnew/whatsnew23.tex @@ -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. |