pyechart 入坑记之绘图时只显示横纵轴不显示数据

import pyecharts.options as opts
from pyecharts.charts import Line
from pyecharts.globals import ThemeType
from pyecharts.faker import Faker

datex = [1995,1996,1997,1998,1999,2000,2001,2002,2003,2004,2005,2006,2007,2008,2009]
datey = [0.32,0.32,0.32,0.32,0.33,0.33,0.34,0.37,0.37,0.37,0.37,0.39,0.41,0.42,0.44]

(
    Line(init_opts=opts.InitOpts(theme=ThemeType.DARK))
    .set_global_opts(
        title_opts=opts.TitleOpts(title= " 美国邮费阶梯图",subtitle="课本例1"),
#         toolbox_opts = opts.ToolboxOpts(is_show=True),
#         legend_opts = opts.LegendOpts(is_show=True),
        yaxis_opts=opts.AxisOpts(
            min_=3,
            max_=4.5,
            type_="value",
            axistick_opts=opts.AxisTickOpts(is_show=True),
            splitline_opts=opts.SplitLineOpts(is_show=True),
        ),
        visualmap_opts = opts.VisualMapOpts(is_show=True)
#         "Price",datx, daty, is_tep = True,is_label_show = True,yaxis_min =0.3,
#         yaxis_max = 0.45
    )
    .add_xaxis(xaxis_data = datex)
    
    .add_yaxis(
        series_name = "Price",
        y_axis = list(datey),
#        y_axis = Faker.values(),
#         datey,
        is_step=True,
        symbol="emptyCircle",
        is_symbol_show=True,
        label_opts=opts.LabelOpts(is_show=True),
#         markline_opts=opts.MarkPointOpts(
#             data=[
#                 opts.MarkPointItem(type_="min",y=0.32),
#                 opts.MarkPointItem(type_="max",y=0.44),
#             ]
#         ),
# # 是否选中图例
#         is_selected = True,

# # 是否连接空数据，空数据使用 `None` 填充
#         is_connect_nones = True,
#         linestyle_opts = opts.LineStyleOpts(
#             is_show=True,
#             opacity=1, 
#         )
    )
    .set_colors(['RED','BLACK'])
    .render_notebook()
)
# Line()