[docs] [issue5088] optparse: inconsistent default value for append actions

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

Note, the :attr:`~Option.dest` variable is a list which includes default
values if any are defined.  Options on the command-line are appended to
this list.  Accordingly, the list may contain both the default value and
the value passed on the command-line.

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nosy: +rhettinger

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<http://bugs.python.org/issue5088>
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