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Takes GET/POST variable dictionary, as might be returned by ``cgi``,
and turns them into lists and dictionaries.
Keys (variable names) can have subkeys, with a ``.`` and
can be numbered with ``-``, like ``a.b-3=something`` means that
the value ``a`` is a dictionary with a key ``b``, and ``b``
is a list, the third(-ish) element with the value ``something``.
Numbers are used to sort, missing numbers are ignored.
This doesn't deal with multiple keys, like in a query string of
``id=10&id=20``, which returns something like ``{'id': ['10',
'20']}``. That's left to someplace else to interpret. If you want to
represent lists in this model, you use indexes, and the lists are
explicitly ordered.
If you want to change the character that determines when to split for
a dict or list, both variable_decode and variable_encode take dict_char
and list_char keyword args. For example, to have the GET/POST variables,
``a_1=something`` as a list, you would use a list_char='_'.
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