我需要一个参数，允许我使用PDFMap而不是plotly.express.scatter_mapbox的开放街道Map更新布局。
我已经搜索了Plotly的文档，并在网上搜索，但我找不到答案。
下面的评论中的一行是我想改变的。

import pandas as pd
import plotly.express as px

us_cities = pd.read_csv("https://raw.githubusercontent.com/plotly/datasets/master/us-cities-top-1k.csv")
fig = px.scatter_mapbox(us_cities, lat="lat", lon="lon", hover_name="City", hover_data=["State", "Population"],
                        color_discrete_sequence=["fuchsia"], zoom=3, height=600)
# --------------------------------------------------
# Change this line to include PDF map instead of "open-street-map"
fig.update_layout(mapbox_style="open-street-map")
# ---------------------------------------------------
fig.update_layout(margin={"r":0,"t":0,"l":0,"b":0})
fig.show()