Method is_nan

tools/python-3.11.9-amd64/Lib/_pydecimal.py:3141–3143

Return True if self is a qNaN or sNaN; otherwise return False.

(self)

        return self._exp == 'F'

    def is_nan(self):
        """Return True if self is a qNaN or sNaN; otherwise return False."""
        return self._exp in ('n', 'N')

    def is_normal(self, context=None):
        """Return True if self is a normal number; otherwise return False."""