This decorator should be robust even if func.__doc__ is None (for example, if -OO was passed to the interpreter)
Usage: construct a docstring.Substitution with a sequence or dictionary suitable for performing substitution; then decorate a suitable function with the constructed object. e.g.
sub_author_name = Substitution(author='Jason')
@sub_author_name def some_function(x): "%(author)s wrote this function"
# note that some_function.__doc__ is now "Jason wrote this function"
One can also use positional arguments.
sub_first_last_names = Substitution('Edgar Allen', 'Poe')
@sub_first_last_names def some_function(x): "%s %s wrote the Raven"
A decorator to take a function's docstring and perform string substitution on it.
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