mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-07-31 23:23:11 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 6

Mention dict.fromkeys()

Browse source 
Various edits
This commit is contained in:
Andrew M. Kuchling 2002-11-27 19:11:10 +00:00
parent 5ef2b214cd
commit b492fa9101
1 changed files with 29 additions and 18 deletions
Download patch file Download diff file Expand all files Collapse all files

47
Doc/whatsnew/whatsnew23.tex
View file

@ -615,11 +615,11 @@ characters may be encountered. So far, Python has allowed specifying
the error processing as either ``strict'' (raising the error processing as either ``strict'' (raising
\exception{UnicodeError}), ``ignore'' (skip the character), or \exception{UnicodeError}), ``ignore'' (skip the character), or
``replace'' (with question mark), defaulting to ``strict''. It may be ``replace'' (with question mark), defaulting to ``strict''. It may be
desirable to specify an alternative processing of the error, e.g. by desirable to specify an alternative processing of the error, such as
inserting an XML character reference or HTML entity reference into the inserting an XML character reference or HTML entity reference into the
converted string. converted string.
Python now has a flexible framework to add additional processing Python now has a flexible framework to add different processing
strategies. New error handlers can be added with strategies. New error handlers can be added with
\function{codecs.register_error}. Codecs then can access the error \function{codecs.register_error}. Codecs then can access the error
handler with \function{codecs.lookup_error}. An equivalent C API has handler with \function{codecs.lookup_error}. An equivalent C API has
@ -631,7 +631,7 @@ replacement string.
Two additional error handlers have been implemented using this Two additional error handlers have been implemented using this
framework: ``backslashreplace'' uses Python backslash quoting to framework: ``backslashreplace'' uses Python backslash quoting to
represent the unencodable character, and ``xmlcharrefreplace'' emits represent unencodable characters and ``xmlcharrefreplace'' emits
XML character references. XML character references.
\begin{seealso} \begin{seealso}
@ -821,7 +821,13 @@ KeyError: pop(): dictionary is empty
>>> >>>
\end{verbatim} \end{verbatim}
(Patch contributed by Raymond Hettinger.) There's also a new class method,
\method{dict.fromkeys(\var{iterable}, \var{value})}, that
creates a dictionary with keys taken from the supplied iterator
\var{iterable} and all values set to \var{value}, defaulting to
\code{None}.
(Patches contributed by Raymond Hettinger.)
\item The \keyword{assert} statement no longer checks the \code{__debug__} \item The \keyword{assert} statement no longer checks the \code{__debug__}
flag, so you can no longer disable assertions by assigning to \code{__debug__}. flag, so you can no longer disable assertions by assigning to \code{__debug__}.
@ -1283,29 +1289,28 @@ stamps, or if they use the tuple API. If used, the feature should be
activated on an application level instead of trying to enable it on a activated on an application level instead of trying to enable it on a
per-use basis. per-use basis.
\item Calling Tcl methods through \module{_tkinter} now does not \item Calling Tcl methods through \module{_tkinter} no longer
always return strings anymore. Instead, if Tcl returns other objects, returns only strings. Instead, if Tcl returns other objects those
those objects are converted to their Python equivalent, if one exists, objects are converted to their Python equivalent, if one exists, or
or wrapped with a \class{_tkinter.Tcl_Obj} object if no Python wrapped with a \class{_tkinter.Tcl_Obj} object if no Python equivalent
equivalent exists. This behaviour can be controlled through the exists. This behaviour can be controlled through the
\method{wantobjects} method of \class{tkapp} objects. \method{wantobjects()} method of \class{tkapp} objects.
When using _tkinter through Tkinter.py (i.e. for most _tkinter When using \module{_tkinter} through the \module{Tkinter} module (as
applications), this feature is always activated. It should not cause most Tkinter applications will), this feature is always activated. It
compatibility problems, since Tkinter would always convert string should not cause compatibility problems, since Tkinter would always
results to Python types were possible. convert string results to Python types where possible.
If any incompatibilities are found, the old behaviour can be restored If any incompatibilities are found, the old behaviour can be restored
by invoking by setting the \member{wantobjects} variable in the \module{Tkinter}
module to false before creating the first \class{tkapp} object.
\begin{verbatim} \begin{verbatim}
import Tkinter import Tkinter
Tkinter.wantobjects = 0 Tkinter.wantobjects = 0
\end{verbatim} \end{verbatim}
before creating the first \class{tkapp} object. Please report any breakage caused by this change as a bug.
Please report any such breakage as a bug.
\end{itemize} \end{itemize}
@ -1652,6 +1657,12 @@ if \var{X} is more than one character long.
integer instead of raising an \exception{OverflowError} when a string integer instead of raising an \exception{OverflowError} when a string
or floating-point number is too large to fit into an integer. or floating-point number is too large to fit into an integer.
\item Calling Tcl methods through \module{_tkinter} no longer
returns only strings. Instead, if Tcl returns other objects those
objects are converted to their Python equivalent, if one exists, or
wrapped with a \class{_tkinter.Tcl_Obj} object if no Python equivalent
exists.
\item You can no longer disable assertions by assigning to \code{__debug__}. \item You can no longer disable assertions by assigning to \code{__debug__}.
\item The Distutils \function{setup()} function has gained various new \item The Distutils \function{setup()} function has gained various new