用Pyecharts的Calendar画图图片正上方有一个小方格怎么删去

可以通过以下代码去除图片正上方的小方格：

from pyecharts.charts import Calendar
from pyecharts import options as opts

cal = Calendar()
cal.add("日历图", [], [], calendar_opts=opts.CalendarOpts(pos_top="50px"))
cal.set_global_opts(
    title_opts=opts.TitleOpts(title="日历图示例"),
    graphic_opts=[
        opts.GraphicGroup(
            graphic_item=opts.GraphicItem(
                left="center",
                top="50%",
                bounding="raw",
                children=[
                    opts.GraphicRect(
                        graphic_item=opts.GraphicItem(left="center", top="middle"),
                        graphic_shape_opts=opts.GraphicShapeOpts(width=400, height=50),
                        graphic_basicstyle_opts=opts.GraphicBasicStyleOpts(fill="#fff"),
                    )
                ],
            )
        )
    ],
)
cal.render("calendar.html")

在上述代码中，通过 `graphic_basicstyle_opts=opts.GraphicBasicStyleOpts(fill="#fff")` 将小方格改为白色从而实现去除小方格的效果。