python：一旦我的函数完成了我想要的任务，我怎么能让它停止读取列表呢

我需要能够使用列表中的数据将4张纸粘贴到广告牌背景上，以下是该列表的一小部分：

data_sets = [
# These two initial data sets don't put any sheets on the billboard
# Data sets 0 - 1
['O'],
['X'],
# These data sets put Sheet A in all possible locations and orientations
# Data sets 2 - 9
['O', ['Sheet A', 'Location 1', 'Upright']],
['O', ['Sheet A', 'Location 2', 'Upright']],
['O', ['Sheet A', 'Location 3', 'Upright']],
['O', ['Sheet A', 'Location 4', 'Upright']],
['O', ['Sheet A', 'Location 1', 'Upside down']],
['O', ['Sheet A', 'Location 2', 'Upside down']],
['O', ['Sheet A', 'Location 3', 'Upside down']],
['O', ['Sheet A', 'Location 4', 'Upside down']]
]

我试着让乌龟画我的表格，但一旦它画了，它会继续浏览整个列表并绘制轮廓，我需要它在执行sheet_a_直立（）后停止浏览列表。“x”和“o”在这一点上没有任何意义，不要理会它们。同样的事情也发生在我的goto_loc（）函数上，但我通过将数据集作为参数来修复它，当我对sheet（）函数执行此操作时，它最终没有绘制任何东西

#location function for data_sets
def goto_loc(data_sets):
    for location in data_sets:
        if len(location)>1 and 'Location 1' in location[1]:
            goto(-300, 0)
        elif len(location)>1 and 'Location 2' in location[1]:
            goto(-100, 0)
        elif len(location)>1 and 'Location 3' in location[1]:
            goto(100, 0)
        elif len(location)>1 and 'Location 4' in location[1]:
            goto(300, 0)

#function for which sheet should be drawn from data_sets
def sheet():
    for style in data_sets:
        if len(style)>1 and 'Sheet A' in style[1]:
            sheet_a_upright()
        elif len(style)>1 and 'Sheet B' in style[1]:
            sheet_b_upright()
        elif len(style)>1 and 'Sheet C' in style[1]:
            sheet_c_upright()
        elif len(style)>1 and 'Sheet D' in style[1]:
            sheet_d_upright()

#define sheet outline and fill
def outline():
    penup()
    forward(100)
    pendown()
    fillcolor('green')
    begin_fill()
    left(90)
    fd(250)
    left(90)
    fd(200)
    left(90)
    fd(500)
    left(90)
    fd(200)
    left(90)
    fd(250)
    right(90)
    penup()
    end_fill()

#function for sheet A in upright position
def sheet_a_upright():
    #sheet outline and fill
    outline()

# Paste the sheets onto the billboard as per the provided data set
def paste_up(data_sets):
    for each in data_sets:
        goto_loc(data_sets)
        sheet()

paste_up(data_sets[2])

---

如果执行了

sheet\u a\u直立（）

，请让您的

sheet

函数

返回True

def sheet():
            for style in data_sets:
                if len(style)>1 and 'Sheet A' in style[1]:
                    sheet_a_upright()
                    return True
                elif len(style)>1 and 'Sheet B' in style[1]:
                    sheet_b_upright()
                elif len(style)>1 and 'Sheet C' in style[1]:
                    sheet_c_upright()
                elif len(style)>1 and 'Sheet D' in style[1]:
                    sheet_d_upright()

然后，在

粘贴

函数中，检查

sheet（）

是否为真：

def paste_up(data_sets):
            for each in data_sets:
                goto_loc(data_sets)
                if sheet():
                    return

---

如果执行了

sheet\u a\u直立（）

，请让您的

sheet

函数

返回True

def sheet():
            for style in data_sets:
                if len(style)>1 and 'Sheet A' in style[1]:
                    sheet_a_upright()
                    return True
                elif len(style)>1 and 'Sheet B' in style[1]:
                    sheet_b_upright()
                elif len(style)>1 and 'Sheet C' in style[1]:
                    sheet_c_upright()
                elif len(style)>1 and 'Sheet D' in style[1]:
                    sheet_d_upright()

然后，在

粘贴

函数中，检查

sheet（）

是否为真：

def paste_up(data_sets):
            for each in data_sets:
                goto_loc(data_sets)
                if sheet():
                    return