让Python的turtle命令更简短(译)

问题: 怎么才能让我的项目代码更少呢, 这个hangman图形的定义代码太多了

def joonista_mees(valede_pakkumiste_arv):
    if valede_pakkumiste_arv == 0:
        ht()
        up()
        right(90)
        forward(150)
        right(90)
        forward(30)
        right(180)
        down()
        forward(200)
        back(170)
        left(90)
        forward(150)
        right(90)
        forward(100)
        right(90)
    if valede_pakkumiste_arv == 1:
        forward(15)
        right(90)
        circle(15)
        left(90)
        up()
        forward(30)
        down()
    if valede_pakkumiste_arv == 2:
        forward(45)
        backward(45)
        right(45)
        forward(20)
        backward(20)
        left(90)
    if valede_pakkumiste_arv == 3:
        forward(20)
        backward(20)
        right(45)
        forward(45)
        right(30)
    if valede_pakkumiste_arv == 4:
        forward(45)
        backward(45)
        left(60)
    if valede_pakkumiste_arv == 5:
        forward(45)
        backward(45)
        right(30)
        up()
        backward(67)
    if valede_pakkumiste_arv == 6:
        right(90)
        forward(3)
        right(45)
        down()
        forward(3)
        backward(6)
        forward(3)
        right(90)
        forward(3)
        backward(6)
        forward(3)
        right(45)
        up()
        forward(6)
        left(45)
        down()
        forward(3)
        backward(6)
        forward(3)
        right(90)
        forward(3)
        backward(7)

有什么方法可以让代码更紧凑呢? 或许可以把一些代码写进同一行?

回答: 你可以写一个小解释器作为一种迷你语言

比如,你可以把

forward(3)
right(90)
forward(3)
backward(7)

编码进字符串,像这样dostring = "f 3 r 90 f 3 b 7",

它的解释器可以这样编写:

def interpret( dostring ):
     tokens = dostring.split()
     for command_id in range(0, len(tokens), 2):
             command = tokens[command_id]
             param = int(tokens[command_id+1])
             if command == "f":
                 forward( param )
             elif command == "b":
                 backward( param )
             elif command == "r":
                 right(param)
             else:
                 print("Unknown command: %s" % command)

然后, 只需这样调用interpret("f 3 r 90 f 3 b 7")

来源：oschina

链接：https://my.oschina.net/u/347219/blog/608356