在Python中创建一个简单的脚本语言

import ast

class MyScriptLanguage(ast.NodeVisitor):
    def visit_Expression(self, node):
        # 处理表达式节点
        value = self.visit(node.body)
        print(value)

    def visit_BinOp(self, node):
        # 处理二元操作节点
        left = self.visit(node.left)
        right = self.visit(node.right)
        if isinstance(node.op, ast.Add):
            return left + right
        elif isinstance(node.op, ast.Sub):
            return left - right
        elif isinstance(node.op, ast.Mult):
            return left * right
        elif isinstance(node.op, ast.Div):
            return left / right

    def visit_Num(self, node):
        # 处理数字节点
        return node.n

script = """
result = 2 + 3 * 4
result
"""

tree = ast.parse(script)
visitor = MyScriptLanguage()
visitor.visit(tree)