用Python实现一个虚拟机需要多久？10分钟！

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:
return self.stack.pop()

@property
def top (self) :
return self.stack[ -1 ]

我们通过 dispatch 方法，来判断当前从指令列表中取得的片段是指令还是数据：

def dispatch(self, opcode):
    dispatch_map = {
        "%":        self.mod,
        "*":        self.mul,
        "+":        self.plus,
        "-":        self.minus,
        "/":        self.div,
        "==":       self.eq,
        "cast_int": self.cast_int,
        "cast_str": self.cast_str,
        "drop":     self.drop,
        "dup":      self.dup,
        "exit":     self.exit,
        "if":       self.if_stmt,
        "jmp":      self.jmp,
        "over":     self.over,
        "print":    self.print,
        "println":  self.println,
        "read":     self.read,
        "stack":    self.dump_stack,
        "swap"

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