def keys(self, section, prefix=None):
        """
        Returns all keys of a *section* in a list. When *prefix* is set, only keys starting with
        that prefix are returned
        """
        return [key for key, _ in self.items(section) if (not prefix or key.startswith(prefix))]
Returns all keys of a *section* in a list. When *prefix* is set, only keys starting with
        that prefix are returned