SF #751062: Tutorial: remove string exceptions, add parnassus, #posts
(Contributed by Gerritt Holl) * Remove the last mentions of string exceptions * Reference a third-party repository of programs * Minor clarification of comp.lang.py posting volumes
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@ -4117,11 +4117,10 @@ Instance method objects have attributes, too: \code{m.im_self} is the
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object of which the method is an instance, and \code{m.im_func} is the
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function object corresponding to the method.
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\subsection{Exceptions Can Be Classes \label{exceptionClasses}}
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\subsection{Exceptions Are Classes Too\label{exceptionClasses}}
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User-defined exceptions are no longer limited to being string objects
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--- they can be identified by classes as well. Using this mechanism it
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is possible to create extensible hierarchies of exceptions.
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User-defined exceptions are identified by classes as well. Using this
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mechanism it is possible to create extensible hierarchies of exceptions.
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There are two new valid (semantic) forms for the raise statement:
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@ -4139,8 +4138,7 @@ shorthand for:
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raise instance.__class__, instance
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\end{verbatim}
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An except clause may list classes as well as string objects. A class
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in an except clause is compatible with an exception if it is the same
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A class in an except clause is compatible with an exception if it is the same
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class or a base class thereof (but not the other way around --- an
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except clause listing a derived class is not compatible with a base
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class). For example, the following code will print B, C, D in that
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@ -4199,13 +4197,16 @@ world, such as Europe, Japan, and Australia; a mirror may be faster
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than the main site, depending on your geographical location. A more
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informal site is \url{http://starship.python.net/}, which contains a
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bunch of Python-related personal home pages; many people have
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downloadable software there.
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downloadable software there. Many more user-created Python modules
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can be found in a third-party repository at
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\url{http://www.vex.net/parnassus}.
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For Python-related questions and problem reports, you can post to the
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newsgroup \newsgroup{comp.lang.python}, or send them to the mailing
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list at \email{python-list@python.org}. The newsgroup and mailing list
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are gatewayed, so messages posted to one will automatically be
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forwarded to the other. There are around 120 postings a day,
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forwarded to the other. There are around 120 postings a day (with peaks
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up to several hundred),
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% Postings figure based on average of last six months activity as
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% reported by www.egroups.com; Jan. 2000 - June 2000: 21272 msgs / 182
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% days = 116.9 msgs / day and steadily increasing.
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