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我正在做一项任务，我需要在地图上的点之间画一条线。我使用 if 语句构建它，但这限制了我可以做某事的次数，所以想使用循环。

到目前为止我的代码如下，我可以添加城市并画一条线，但它会画一条线到自己而不是从起点到下一个点（并继续）

有人可以帮忙吗？

def level1():
    cityXvalue = [45,95,182,207,256,312,328,350,374,400]
    cityYvalue = [310,147,84,201,337,375,434,348,335,265]
    # Display the map image
    map = makePicture(getMediaPath("map.png"))
    show(map)
    number = 0
    # Ask user to enter numbers of the cities they wish to visit    
    cities = requestInteger("Enter the number of the city you would like to visit")
    # Draw a line between previously entered point and current one
    while cities > number:
        city = requestInteger("Please choose a city number")
        addLine(map,cityXvalue[city],cityYvalue[city], cityXvalue[city], cityYvalue[city])
    repaint(map)
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