Python 这个循环是怎么回事？

我试图创建一行正方形，其数量由用户输入决定。 我希望每个正方形的x坐标乘以循环运行的次数，再乘以每个正方形的宽度。 到目前为止，它似乎要么只画一个正方形，要么我给draw函数提供了每个循环相同的坐标。 有人能发现我的错误吗

def main():
    seed()  # Initialize random number generator

    top_left_x = 100
    top_left_y = 100
    width = 60
    height = 60
    y_num = 0
    # num_rows = int(input('Number of rows: '))  # commented out for now
    num_columns = int(input('Number of columns: '))



    for i in range (num_columns):
        window = GraphWin('Lab 3B', 800, 800)
        new_x = i * width + top_left_x
        new_y = top_left_y
        top_left_point = Point(new_x, new_y)
        bottom_right_point = Point(new_x + width, new_y + height)
        enclosing_rectangle = Rectangle(top_left_point, bottom_right_point)
        enclosing_rectangle.setFill(random_color())
        enclosing_rectangle.draw(window)

    for i in range(10):
        c_point = window.getMouse()
        x_c_point = c_point.getX()
        y_c_point = c_point.getY()
        print('x =', x_c_point, 'y =', y_c_point)

    window.getMouse()
    window.close()

这将在每次循环中重新创建窗口。像这样交换前两行：

window = GraphWin('Lab 3B', 800, 800)
for i in range (num_columns):
    new_x = i * width + top_left_x

但是，下一个问题是您也只有一个矩形，因此您需要保存您创建的每个矩形，因此这应该可以工作：

window = GraphWin('Lab 3B', 800, 800)
rects = [] # Stores rectangles
for i in range (num_columns):
    new_x = i * width + top_left_x
    new_y = top_left_y
    top_left_point = Point(new_x, new_y)
    bottom_right_point = Point(new_x + width, new_y + height)
    enclosing_rectangle = Rectangle(top_left_point, bottom_right_point)
    enclosing_rectangle.setFill(random_color())
    enclosing_rectangle.draw(window)
    rects.append(enclosing_rectangle) # Keep this rectangle

---

好的，是的，这很有道理，谢谢！它仍然只画了一个正方形。好吧，我已经更新了我的答案；在程序运行期间，您需要保留所有的

矩形

对象

window = GraphWin('Lab 3B', 800, 800)
rects = [] # Stores rectangles
for i in range (num_columns):
    new_x = i * width + top_left_x
    new_y = top_left_y
    top_left_point = Point(new_x, new_y)
    bottom_right_point = Point(new_x + width, new_y + height)
    enclosing_rectangle = Rectangle(top_left_point, bottom_right_point)
    enclosing_rectangle.setFill(random_color())
    enclosing_rectangle.draw(window)
    rects.append(enclosing_rectangle) # Keep this rectangle