def block_effect(self):
        """Effect of the block stack
        Returns +1 (push), 0 (none) or -1 (pop)
        """
        if self.opname.startswith('SETUP_'):
            return 1
        elif self.opname == 'POP_BLOCK':
            return -1
        else:
            return 0
Effect of the block stack
        Returns +1 (push), 0 (none) or -1 (pop)
        
numba/core/bytecode.py