awk.py 文件源码

def parse_assign_expr(ctx, tree, subparser):
    if isinstance(tree, _ast.Assign):
        assert len(tree.targets) == 1 and isinstance(tree.targets[0], _ast.Name)
        return RowExprAssign(tree.targets[0].id, subparser(ctx, tree.value))
    elif isinstance(tree, _ast.Expr):
        if isinstance(tree.value, _ast.Name):
            return RowExprAssign(tree.value.id, subparser(ctx, tree))
        else:
            raise Exception("Please assign expression to a variable")
    else:
        raise Exception("Please assign expression to a variable")