upgrade(self, value)
The supplied string :None:None:`value` is converted by testing different converters in order. First the :None:None:`func` method of the StringConverter
instance is tried, if this fails other available converters are tried. The order in which these other converters are tried is determined by the :None:None:`_status` attribute of the instance.
The string to convert.
The result of converting :None:None:`value` with the appropriate converter.
Find the best converter for a given string, and return the result.
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