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authorTim Peters <tim.peters@gmail.com>2002-12-24 16:30:58 (GMT)
committerTim Peters <tim.peters@gmail.com>2002-12-24 16:30:58 (GMT)
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Added note about technical pickle limitation on tzinfo instances.
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diff --git a/Doc/lib/libdatetime.tex b/Doc/lib/libdatetime.tex
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@@ -755,9 +755,14 @@ The latter objects view their fields as being in local time, and the
from UTC, the name of the time zone, and DST offset, all relative to a
date or time object passed to them.
+Special requirement for pickling: A tzinfo subclass must have an
+\method{__init__} method that can be called with no arguments, else it
+can be pickled but possibly not unpickled again. This is a technical
+requirement that may be relaxed in the future.
+
A concrete subclass of \class{tzinfo} may need to implement the
following methods. Exactly which methods are needed depends on the
-uses made of aware \class{datetime} objects; if in doubt, simply
+uses made of aware \module{datetime} objects; if in doubt, simply
implement all of them. The methods are called by a \class{datetimetz}
or \class{timetz} object, passing itself as the argument. A
\class{tzinfo} subclass's methods should be prepared to accept a dt