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Diffstat (limited to 'Doc/whatsnew/whatsnew25.tex')
| -rw-r--r-- | Doc/whatsnew/whatsnew25.tex | 22 |
1 files changed, 14 insertions, 8 deletions
diff --git a/Doc/whatsnew/whatsnew25.tex b/Doc/whatsnew/whatsnew25.tex index 5bee789..4015d98 100644 --- a/Doc/whatsnew/whatsnew25.tex +++ b/Doc/whatsnew/whatsnew25.tex @@ -1166,12 +1166,13 @@ In 2.5 the internal data structure has been customized for implementing sets, and as a result sets will use a third less memory and are somewhat faster. (Implemented by Raymond Hettinger.) -\item The speed of some Unicode operations, such as -finding substrings, string splitting, and character map decoding, has -been improved. (Substring search and splitting improvements were +\item The speed of some Unicode operations, such as finding +substrings, string splitting, and character map encoding and decoding, +has been improved. (Substring search and splitting improvements were added by Fredrik Lundh and Andrew Dalke at the NeedForSpeed -sprint. Character map decoding was improved by Walter D\"orwald.) -% Patch 1313939 +sprint. Character maps were improved by Walter D\"orwald and +Martin von~L\"owis.) +% Patch 1313939, 1359618 \item The \function{long(\var{str}, \var{base})} function is now faster on long digit strings because fewer intermediate results are @@ -1185,6 +1186,11 @@ strings into an internal representation and caches this representation, yielding a 20\% speedup. (Contributed by Bob Ippolito at the NeedForSpeed sprint.) +\item The \module{re} module got a 1 or 2\% speedup by switching to +Python's allocator functions instead of the system's +\cfunction{malloc()} and \cfunction{free()}. +(Contributed by Jack Diederich at the NeedForSpeed sprint.) + \item The code generator's peephole optimizer now performs simple constant folding in expressions. If you write something like \code{a = 2+3}, the code generator will do the arithmetic and produce @@ -1358,7 +1364,6 @@ to specify which generation to collect. now support a \code{key} keyword parameter similar to the one provided by the \function{min()}/\function{max()} functions and the \method{sort()} methods. For example: -Example: \begin{verbatim} >>> import heapq @@ -1923,10 +1928,11 @@ variables. You shouldn't assemble your query using Python's string operations because doing so is insecure; it makes your program vulnerable to an SQL injection attack. -Instead, use SQLite's parameter substitution. Put \samp{?} as a +Instead, use the DB-API's parameter substitution. Put \samp{?} as a placeholder wherever you want to use a value, and then provide a tuple of values as the second argument to the cursor's \method{execute()} -method. For example: +method. (Other database modules may use a different placeholder, +such as \samp{\%s} or \samp{:1}.) For example: \begin{verbatim} # Never do this -- insecure! |