Serhiy Storchaka <storchaka+cpyt...@gmail.com> added the comment:
The simplest way of collecting template names is to use a defaultdict:
>>> d = collections.defaultdict(str)
>>> string.Template('$a $b').substitute(d)
' '
>>> d.keys()
dict_keys(['a', 'b'])
You can use a custom mapping if you need special handling of absent keys.
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue46307>
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