龟图形动画(架子)

时间:2017-03-11 17:05:18

标签: python python-3.x for-loop turtle-graphics

我想定义一个函数insert_animate(blockposition, shelf, high),以便从blockposition移除shelf的块,并将此块插入high的高位,其中high 1}}是一个整数。该函数应该在零和高位之间找到这个位置,不包括高位。如果没有找到这样的位置,则将块插入高位。

我设法提出了这个功能:

def insert_animate(blockposition, shelf, high):
    if blockposition==0:
        return shelf
    else:
        a=s.pop(blockposition)
        for i in range(high):
            if a.size<=s[i].size:
                s.insert(i,a)
                break
            else:
                s.insert(high,a)
        return shelf

然而,这只适用于某些情况,而不是全部。我不确定我哪里出错了。

s = shelf.init_shelf((2, 6, 1, 4, 8, 3, 9))
print(insert_animate(0, s, 0)) # returns [Block size: 2, Block size: 6, Block size: 1, Block size: 4, Block size: 8, Block size: 3, Block size: 9]
print(insert_animate(3, s, 3)) 
# returns [Block size: 1, Block size: 2, Block size: 4, Block size: 6, Block size: 4, Block size: 4, Block size: 8, Block size: 3, Block size: 9]

但它应该是(第二次印刷):

[Block size: 1, Block size: 2, Block size: 4, Block size: 6, Block size: 4, Block size: 4, Block size: 8, Block size: 3, Block size: 9]

print(insert_animate(6, s, 6))
# returns [Block size: 1, Block size: 2, Block size: 4, Block size: 6, Block size: 4, Block size: 4, Block size: 8, Block size: 8, Block size: 8, Block size: 8, Block size: 8, Block size: 8, Block size: 3, Block size: 9]

但应该是:

[Block size: 1, Block size: 2, Block size: 4, Block size: 6, Block size: 8, Block size: 3, Block size: 9]

为什么我的代码适用于某些情况但不适用于其他情况?问题出在我的for循环中吗?如果有人可以提供帮助,我会非常感激!谢谢!

这是我正在处理的文件:

from turtle import *

class Block(Turtle):
    def __init__(self, size):
        self.size = size
        Turtle.__init__(self, shape="square", visible=False)
        self.pu()
        self.shapesize(size * 1.5, 1.5, 2) # square-->rectangle
        self.fillcolor("black")
        self.st()
    def glow(self):
        self.fillcolor("red")
    def unglow(self):
        self.fillcolor("black")
    def __repr__(self):
        return "Block size: {0}".format(self.size)

class Shelf(list):
    def __init__(self, y):
        "create an shelf. y is y-position of first block"
        self.y = y
        self.x = -150
    def push(self, d):
        width, _, _ = d.shapesize()
        yoffset = width/2 * 20 # to align the blocks by it's bottom edge
        d.sety(self.y + yoffset)
        d.setx(self.x+34*len(self))
        self.append(d)
    def _close_gap_from_i(self, i):
        for b in self[i:]:
            xpos, _ = b.pos()
            b.setx(xpos - 34)
    def _open_gap_from_i(self, i):
        for b in self[i:]:
            xpos, _ = b.pos()
            b.setx(xpos + 34)
    def pop(self, key):
        b = list.pop(self, key)
        b.glow()
        b.sety(200)
        self._close_gap_from_i(key)
        return b
    def insert(self, key, b):
        self._open_gap_from_i(key)
        list.insert(self, key, b)
        b.setx(self.x+34*key)
        width, _, _ = b.shapesize()
        yoffset = width/2 * 20 # to align the blocks by it's bottom edge
        b.sety(self.y + yoffset)
        b.unglow()

def show_text(text):
    goto(0,-250)
    write(text, align="center", font=("Courier", 16, "bold"))

def start_sort():
    onkey(None,"space")
    clear()
    show_text("sort_me")
    sort_func(s)

def init_shelf(vals=(4, 8, 2, 9, 3, 1, 10, 7, 5, 6)):
    s = Shelf(-200)
    for i in vals:
        s.push(Block(i))
    return s

def clear_window():
    getscreen().clearscreen()

def main(func):
    global sort_func
    sort_func = func
    getscreen().clearscreen()
    ht(); penup()
    init_shelf()
    show_text("press spacebar to start sorting")
    onkey(start_sort, "space")
    onkey(bye, "Escape")
    listen()
    mainloop()

1 个答案:

答案 0 :(得分:0)

在致电insert_animate()后,很难按照您的启动顺序和最终订单的示例进行操作,但这里是我对错误的猜测:

我相信你的else子句缩进不正确(太深),以至于当if语句确实应该成为for的一部分时它已成为def insert_animate(blockposition, shelf, high): if blockposition == 0: return shelf a = s.pop(blockposition) for i in range(high): if a.size <= s[i].size: s.insert(i, a) break else: # no break s.insert(high, a) return shelf 语句的一部分声明:

else

如最初编写的那样,for子句可以多次执行,但只有当break循环通过else以外的方式退出时,您才希望执行一次。以这种方式绑定到循环的break子句可以被认为是意义&#34;没有中断&#34;,即如果循环具有{{1}}语句但是它不是&#39,则执行此代码采取。