All assignments to names go through this function.

def visit_Name(self, node, store_as_param=False, **kwargs):
        """All assignments to names go through this function."""
        if store_as_param or node.ctx == 'param':
            self.symbols.declare_parameter(node.name)
        elif node.ctx == 'store':
            self.symbols.store(node.name)
        elif node.ctx == 'load':
            self.symbols.load(node.name)