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Reinhold, libstdtypes.tex needs two fixes.

 \versionadded{2.3}
+\versionchanged[The encoding attribute is now writable and 
is used
+for encoding Unicode strings given to \method{write()} and 
+\method{writelines()}.]{
                      ~~~
First, versionchanged tag does not have a trailing brace and it 
resuls in compile error.

Second(really trivial), versionchanged macro automatically 
appends a period at the end of the sentence(see the link [*]), 
so you don't need to put it by hand.

Then the above line would become:

+\method{writelines()}]{2.5}

[*]: http://docs.python.org/doc/inline-markup.html