qiskit/qasm/node/prefix.py
def sym(self, nested_scope=None):
        """Return the correspond symbolic number."""
        operation = self.children[0].operation()
        expr = self.children[1].sym(nested_scope)
        return operation(expr)
def sym(self, nested_scope=None):
        """Return the correspond symbolic number."""
        operation = self.children[0].operation()
        expr = self.children[1].sym(nested_scope)
        return operation(expr)
Return the correspond symbolic number.